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Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE

Date 11-14 Oct 1993

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Displaying Results 1 - 25 of 62
  • An enhanced optimal windowed RLS algorithm for fading multipath channel estimation

    Publication Year: 1993 , Page(s): 1003 - 1007 vol.3
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    Estimation of a fading channel with high accuracy is a key factor for successful signal detection in many mobile, indoor and personal radio communication systems. The optimal windowed recursive least squares (OW-RLS) algorithm developed previously (1993) results in a significant improvement over an exponential windowed recursive least squares algorithm when it is applied to tracking a fading channel. The improvement is confirmed by simulation on a single path fading channel. However, no improvement in performance has been obtained in the simulation of multipath frequency selective channels. This paper shows that the undesirable result is caused by an additional error which is introduced by an incomplete decoupling of cross-correlation terms. The authors design a feedback decoupling method which can cancel the bias almost completely. Simulations show that the theoretical improvement of an OW-RLS algorithm on a fading multipath channel can be completely recovered. With this modification, an enhanced OW-RLS algorithm is described View full abstract»

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  • Performance of trellis coded modulation with 8PSK through TDRSS

    Publication Year: 1993 , Page(s): 963 - 967 vol.3
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    The need to increase data-rate capabilities of the Tracking and Data Relay Satellite System (TDRSS) has prompted NASA to investigate bandwidth-efficient modulation schemes. Based upon current technology the most promising scheme is Trellis-Coded Modulation (TCM) operating with Octal Phase Shift Keying (8 PSK). In conjunction with NASA, New Mexico State University's Manuel Lujan Jr. Center for Space Telemetering and Telecommunications Systems has constructed a system to test this new candidate TDRSS modulation scheme, TCM 8 PSK. This system was tested through the TDRSS channel to demonstrate that this coding scheme operates as well over the actual channel as it has in lab experiments and simulations. Two interchangeable codecs, implementing separate TCM techniques, were tested. The results of this experiment and subsequent data analysis are presented in this paper View full abstract»

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  • Definition of a commercial mobile satellite services network to meet DoD communications needs

    Publication Year: 1993 , Page(s): 821 - 825 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    Commercial-based satellite networks have the potential to provide cost effective communications support for the Department of Defense (DoD's) less critical needs which include administration, logistics, and other support functions. This paper summarizes the definition of a possible multi-vendor Mobile Satellite Services (MSS) network architecture. A determination is presented as to what degree existing and planned commercial MSS systems could satisfy worldwide current and projected DoD communication requirements without adversely affect military requirements and national security. An architecture is defined that satisfies the military mobile communications requirements via use of commercial MSS and FSS resources. In this way worldwide commercial satellite communications capabilities can be exploited and the significant private sector investments that will have been made for a commercial market can be leveraged. This commercial-based architecture could be incorporated as a component resource of the DoD worldwide military satellite communications architecture. The MSS networks would augment the Defense Information Systems Agency's (DISA) evolving Defense Information Systems Network (DISN) concept and other existing DoD user networks, provide access to terrestrial DoD networks, and support interoperability and sharing of transmission assets to meet the various DoD voice, data, video and other requirements View full abstract»

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  • Reduced complexity adaptive structures for jam-resistant satellite communications

    Publication Year: 1993 , Page(s): 1033 - 1037 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB)  

    A linearly constrained wideband adaptive array sensor is described whose adaptive processor is realized with a two-dimensional orthogonal filter bank structure. It is demonstrated via simulation that the transform domain processor utilizing the computationally simple least mean square (LMS) algorithm is capable of convergence speeds which rival the more expensive to implement least squares methods. Furthermore, there is no additional cost in terms of the adaptive coefficient requirements (and only a modest increase in non-adaptive computational requirements) when compared to the standard tapped-delay-line (TDL) structure array utilizing the LMS algorithm. This performance increase provides a quicker approach to the optimal steady state solution, and is therefore more robust to a non-stationary environment than the corresponding TDL structure LMS processor. The flexibility of this new structure will permit both `block' and `sample' filter operations and is therefore proposed for the implementation of wavelet filters and generalized multirate filter banks. The results are equally valid for other array forms (such as unconstrained nonlinear arrays), for space-based Multiple Beam Antennas (MBAs) in satellite communications, and for other applications such as radar and sonar adaptive nulling View full abstract»

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  • Mean exit time of a noncoherent DLL for a randomly fluctuating channel delay

    Publication Year: 1993 , Page(s): 804 - 808 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB)  

    The influence of a randomly fluctuating channel delay time on the mean exit time (mean time to lose lock, MTLL) of a noncoherent second-order delay-locked loop (DLL) is investigated. First, the authors derive a systematic approximation for the MTLL of this pseudo-noise (PN) code tracking loop by applying the singular perturbation method. With this approximation they then find the optimal loop parameters and the corresponding maximum achievable MTLL. Furthermore, this robust design that yields a loop which loses lock as rare as possible is compared to the loop whose parameters were chosen according to the Kalman design for the linearized system View full abstract»

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  • Evolving modeling and simulation technology into fieldable products

    Publication Year: 1993 , Page(s): 907 - 911 vol.3
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB)  

    The US Army Communications-Electronics Command Research, Development and Engineering Center's Space and Terrestrial Communications Directoriate (S&TCD) has a long history of developing computer simulation models of complex command, control, communications (C3) and intelligence systems to assist in concept exploration, feasibility studies, requirements analysis, design evaluations, and test planning. As these computer models have been completed, spin-off applications have been identified and S&TCD has evolved these applications into products fieldable to the Army for use on the battlefield. This paper discusses the methodology and capabilities employed by S&TCD in developing/implementing such products using its evolution of a portion of the Mobile Subscriber Equipment (MSE) System Performance Model into the C3 Network Planner (C3NP) as an example. The C3NP fielding was imminent as part of the Network Planning Terminal (NPT) program managed by the Program Manager, Joint Tactical Area Communications Systems (Provisional) View full abstract»

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  • A distributed architecture for cooperative management of strategic communication networks

    Publication Year: 1993 , Page(s): 879 - 886 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (772 KB)  

    The authors developed a testbed for cooperative distributed problem solving, Testbed Environment for Autonomous Multiagent Cooperative Problem Solving (TEAM-CPS), and successfully applied it to public telephony networks. This paper discusses an extension of this work to military strategic defense systems (SDS). A conceptual SDS model is described. It includes distributed network managers that must cooperatively allocate bandwidth to computer applications in support of critical pre-engagement missile defense functions View full abstract»

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  • On the mean acquisition times of DS receiver code synchronization using matched filters and median filters in AWGN-channel and continuous/pulsed tone jamming

    Publication Year: 1993 , Page(s): 779 - 783 vol.3
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    This paper introduces the analysis and simulation results of a DS spread spectrum system in which the principle of matched filter synchronization for acquisition of code synchronization is used. Mean acquisition time approximations of coherent matched filter synchronization in AWGN-channel, continuous and pulsed tone jamming, when complementary codes are used as the spreading codes, are indicated. The idea of using median type filtering as an aiding device for the matched filter is tested in those situations. It is shown that the performance degradation in AWGN-channel is not catastrophic due to use of the median filter. Continuous and pulsed tone jamming can have a very dramatic influence on mean acquisition time if the imbalances of the codes have large values. The influence of continuous tone jamming can be totally eliminated by using a median filter. Pulsed tone jamming can be eliminated almost totally, if jamming is pulsed so that it is on during some whole code periods. Simulations show that the jamming can be eliminated even if the jamming is pulsed in a way that it is on during some chips within every code period View full abstract»

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  • A decision feed-back blind equalization algorithm based on a cluster formation technique

    Publication Year: 1993 , Page(s): 1013 - 1017 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    This paper proposes a decision feed-back blind equalization (DFBE) algorithm to reconstruct a QPSK constellation degraded by a stationary multipath channel and additive white Gaussian noise. The equalizer structure is composed of two filters, a feed-forward filter and a feed-back filter. The inputs to the feed-forward and feed-back filters are the received signal sequence and the detected symbols, respectively. Both filters are updated by a stochastic gradient algorithm in proportion to an estimated error based on a Gaussian cluster formation technique. During equalization, the QPSK symbol constellation is modeled as Gaussian clusters centered around the transmitted symbols. Both equalizer filters are updated to minimize the variance of the Gaussian clusters, thereby reconstructing the transmitted symbols. The blind nature of the DFBE algorithm makes it very attractive for mobile communications applications where the reliable transmission of signals through rapidly changing multipath fading channels with deep spectral nulls is a challenging problem yet to be resolved View full abstract»

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  • Simulation of multimedia traffic on FDDI

    Publication Year: 1993 , Page(s): 922 - 926 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    The Fiber Distributed Data Interface (FDDI) is an American National Standards Institute (ANSI) standard for a 100-Mb/s fiber optic token-ring local area network (LAN). It provides synchronous and asynchronous service with a guaranteed bandwidth and response time. Frame transmission is controlled through a token rotation protocol, and stations are allowed to transmit for a predetermined amount of time only if they meet specific timing and priority requirements. The purpose of this paper is to investigate the performance of an FDDI network in which synchronous digitized voice and video signals are transmitted on the same network with asynchronous data under varying network loads View full abstract»

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  • Interconnection of LANs in an open systems environment

    Publication Year: 1993 , Page(s): 892 - 896 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    This paper studies two methods of interconnecting heterogeneous local area networks (LANs) such as Carrier-Sense Multiple-Access (CSMA) and token ring networks in an open systems environment, and evaluates the associated system performance. The first interconnecting method is to link the two LANs through gateways; the second is to use an architecture in which some stations on the ring LAN are also linked to the CSMA LAN via a multiplexer. Through such interconnected LANs, the Department of Defense end users can process data and applications seamlessly in an open systems environment. It has been shown that the second method (a type of dual interface) gives better performance in minimizing the response time and token rotation time, causing less traffic congestion. By allowing routing at the stations on the ring, the comparison becomes rather arbitrary. An optimal traffic routing ratio is determined for the second interconnection method. Moreover, a threshold routing ratio, beyond which the first interconnection is superior in performance, is computed View full abstract»

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  • Efficient use of SATCOM resources in MSE networks (DAMA for MSE)

    Publication Year: 1993 , Page(s): 768 - 773 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    The evolving AirLand Operations (ALO) concept of force deployment in the tactical arena significantly alters requirements for command, control, and communications. Communications must be maintained between widely separated groups of users (enclaves) who cannot be adequately serviced by traditional terrestrial networks. Satellite communications (both military and commercial) have been proposed as one possible response to this range extension requirement. The simple insertion of this technology into large wideband terrestrial networks such as Mobile Subscriber Equipment (MSE) or TRI-TAC can result in inefficient use of limited satellite resources, which in turn limits the operational effectiveness of the overall communication system. In addition, operational and technical constraints inherent in the switching network must be considered to ensure maximum flexibility of the integrated network. In this paper, GTE identifies the design constraints and issues associated with satellite range extension for the MSE network and describes several feasible Demand Assignment Multiple Access (DAMA) architectures. The authors describe the results of a performance analysis and simulation effort that uses GTE tools to develop models of ALO scenarios and then evaluate the relative efficiency and mission effectiveness of these different DAMA alternatives. Each alternative is shown to provide significant improvement over the non-DAMA case but a cost-benefit tradeoff indicates one approach to be preferred. Studies are continuing to characterize these results in more detail and to investigate the extension of these results to alternative satellite systems View full abstract»

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  • Systems engineering and performance evaluation for the Defense Information Systems Network

    Publication Year: 1993 , Page(s): 1063 - 1068 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB)  

    This paper presents systems engineering and performance analysis and evaluation concepts for planning, designing, operating, and managing the Defense Information Systems Network (DISN). The DISN uses Asynchronous Transfer Mode (ATM) high-speed communications services to support a wide class of applications that require high-speed networking and will provide multi-media conferencing, distributed simulation, and training. DISN, via an ATM-based wide area network, will accommodate a wide variety of traffic types, each requiring proper traffic management and congestion control mechanisms. By doing so, new value-added communications services will be offered for the Department of Defense. This paper addresses key aspects of the multimedia services that the DISN will provide and discusses technical issues concerning the quality-of-service. Traffic modeling and characterization of the DISN, capacity management and sizing, and allocation of network resources in response to requirements are studied. The performance analysis, monitoring, and operational effectiveness are also described View full abstract»

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  • Network requirements for a satellite based National Research and Education Network

    Publication Year: 1993 , Page(s): 993 - 997 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    All of the various research networks throughout the US are planned to be integrated into a single, nationwide research network by the mid 1990's. This network will be the third stage of what will be called the National Research and Education Network (NREN). A wide-band communications satellite creates a distance insensitive link between all users, regardless of their locations. In order to assure that a realistic satellite is designed for the NREN, good estimates of the network requirements are needed. This paper outlines the results of a study performed to determine the NREN requirements View full abstract»

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  • Defense Information System Network (DISN) - An overview

    Publication Year: 1993 , Page(s): 1048 - 1052 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    This overview of DISN is a summary of what DISN is today, tomorrow and a projection of the future. It begins with a large number of non-integrated legacy networks that are substantial in size and the initial integration of these systems to improve performance and reduce cost. Emerging requirements for image, voice and data are projected to push DISN into the gigabit arena to support the information requirements of DoD that are associated with “new ways of doing business”. Enabling technologies are progressing on many fronts and are producing performance at a cost that was only “dreamed about” a decade previously. How DISN might use these technologies in its evolution is discussed. DISN's overall goal for post 2000 is summarized. The potential is high for significant overall cost savings and performance improvement as a result of a DISN that allows consolidation and centralization of a number of functions and also enables distributed interactive processes such as modelling and simulation, joint planning, exercises, computing, conferencing, et. al., all of which are discussed in other papers View full abstract»

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  • C4I for the Warrior, the C4I for the Pacific Warrior Initiative, and the Secure Tactical Data Network-4 demonstration

    Publication Year: 1993 , Page(s): 1058 - 1062 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    The C4I for the Warrior concept serves as a much needed vision of jointness, interoperability and integration for the military services and the Department of Defense. The C4I for the Pacific Warrior Initiative at Pacific Command is designed to accelerate achieving these goals by providing a testbed for key ideas and technologies that can migrate to other theaters. The Secure Tactical Data Network demonstrations have been adopted by the Joint Staff as a central element in improving interoperability in a Joint Task Force context. The Advanced Research Project Agency is developing new technology for distributed collaborative planning and C4I decision aides to help in crisis management View full abstract»

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  • Mobile imagery systems using commercial technology

    Publication Year: 1993 , Page(s): 848 - 852 vol.3
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB)  

    Considerable improvement in satellite channel capacity utilization is achievable through application of compression technology to military communications, especially secondary imagery systems. Standards activities are producing uniform and powerful compression algorithms. In addition, the NITFS standardizes the format of digital imagery and imagery related data. NITFS incorporates JPEG and will incorporate other compression algorithms in the future View full abstract»

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  • Analysis of two trunk congestion relief schemes

    Publication Year: 1993 , Page(s): 902 - 906 vol.3
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    During natural disasters such as earthquakes and hurricanes, call volume in the public switched network (PSN) often increases to levels that cause trunk overloads in switches. The result of this overload is an overall degradation in the grade-of-service of the PSN. At times like these it is vitally important that local, state, and federal officials be able to communicate in a reliable and timely manner so that the business of caring and providing for the emergency needs of people is unhampered. To combat the degrading effects of large call volumes, various priority controls have been developed to alleviate trunk overload for critical or select users. This paper describes two trunk congestion relief schemes and the results of a detailed analysis that quantified the performance characteristics and the availability of these schemes in the PSN View full abstract»

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  • A LAN-based communications processor for tactical applications

    Publication Year: 1993 , Page(s): 897 - 901 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    Today's Army Tactical Command and Control System consists of systems that rely on a widely disparate set of communications media equipment, communications networks, and information exchange protocols to exchange information across the battlefield. The future trend in tactical communications is to provide a seamless information network which bridges the communications networks and protocols through the use of a communications processing capability. This communications processing capability must provide the necessary connectivity to the local area network (LAN) and wide area network (WAN) systems in addition to supporting the needed routing and message translation functions. A LAN-based communications processor (LBCP) offers a comprehensive set of communications services, allowing for a single, interoperable communications gateway to serve all of the functional areas. It provides a shared communications resource, furnishes flexible and reconfigurable communications interfaces, eliminates the need for multiple and duplicate interface elements, and allows accessibility to multiple tactical data networks (i.e. MPN, SINCGARS, ADDS). This paper presents an approach for providing a communications processor for tactical communications networks View full abstract»

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  • Future Navy support of joint operations using enhanced SHF SATCOM capabilities

    Publication Year: 1993 , Page(s): 838 - 842 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    The Navy is expanding its communications capabilities in support of joint tactical operations. The use of Super High Frequency (SHF) satellite communications (SATCOM) is greatly expanding across the fleet. As this expansion evolves, the Navy will use new networking approaches to increase communications flexibility and make efficient use of assigned satellite resources. This paper presents new concepts for SHF SATCOM to support joint tactical operations. These concepts support planned SHF SATCOM services and networks using an updated WSC-6 terminal installed on many Navy platforms. Also, in this paper the satellite resources required to support new Navy capabilities are estimated for an example deployment. In addition, an approach using direct ship-to-ship SHF SATCOM links is considered. Also, a method for optimizing satellite transponder loading is introduced View full abstract»

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  • NPT - A success story evolving from teamwork and innovation

    Publication Year: 1993 , Page(s): 874 - 878 vol.3
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    This paper provides a functional description of the Network Planning Terminal (NPT) and describes both the teamwork between internal Government organizations and the systems integration process that resulted in the success of the NPT program. This success highlights the power of Total Quality Management based working groups, the involvement of soldiers, and the cooperative efforts of RD&E programs within the CECOM Research, Development and Engineering Center and ECAC that have provided the baseline NPT product that fits the available resources of the Program Manager View full abstract»

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  • Real-time and compressed video techniques for multi-media tactical FDDI networks

    Publication Year: 1993 , Page(s): 864 - 868 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    The rapid escalation in bandwidth of fiber optic network technologies, such as FDDI and SONET/ATM, has made viable a number of real-time and compressed digital video transmission methods for various workstation multi-media applications. This paper examines two specific packet oriented approaches that offer compressed and uncompressed encoding, and may be used with synchronous stream channels and bursty asynchronous packet channels. A comparison of the performance merits of each is made as well as possible applications in the tactical battlefield View full abstract»

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  • Anti-jamming properties of a DS-CDMA equalization filter

    Publication Year: 1993 , Page(s): 1008 - 1012 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    An adaptive tapped delay line equalizer is described which operates in a DS-CDMA receiver. This structure, without modification, can be applied to make the system insensitive to spectral inefficiency of the transmitted pulse shape (by rejecting multiple-access noise), to act as a RAKE in the presence of multipath interference, and to reject narrowband interference. The latter property is the main focus of this paper; this technique is compared to previously published methods of narrowband noise rejection View full abstract»

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  • Structural properties of a low Earth orbit satellite constellation - the Walker delta network

    Publication Year: 1993 , Page(s): 968 - 972 vol.3
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    The Walker (1984) delta satellite constellation appears to be practical to serve as a low Earth orbit satellite network to provide world-wide networking. The structural properties of the Walker delta network, including diameter, mean message traversal, traffic density, and network saturation conditions are investigated and presented. Three different traffic patterns are used in this study. It has been found that for a fixed number of satellites, the Walker delta network can provide minimum mean message traversal, minimum traffic density and maximum traffic injection rate provided that the number of orbital planes is equal to the number of satellites in each orbital plane. Regarding the injection of messages from ground stations to the satellite network, the network with a smaller size can accept more messages than a network with a larger size before the network saturates. Furthermore, an adaptive routing algorithm, which always routes the message to its destination through one of several available minimal paths, is also presented View full abstract»

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  • Pseudonoise code acquisition time of a transponder with 1-bit analog-to-digital converter at front end

    Publication Year: 1993 , Page(s): 799 - 803 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    Many modern receivers employ intermediate-frequency (IF) sampling and a 1-b analog-to-digital (A/D) converter at the receiver front end for the pseudonoise (PN) spread spectrum communication systems. After the 1-bit A/D converter, the PN code synchronization, the carrier synchronization, and the bit synchronization are implemented digitally with the use of an application-specific integrated circuit. This paper computes the effects on the PN code acquisition time and bit error probability of the 1-bit A/D converter View full abstract»

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