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Communications, IEEE Transactions on

Issue 1 • Date Jan 1992

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Displaying Results 1 - 24 of 24
  • Multireception probabilities for FH/SSMA communications

    Publication Year: 1992 , Page(s): 223 - 233
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (700 KB)  

    Exact expressions for the probabilities P(l,m-l/k) of l correct packet receptions and m-l erroneous ones, out of total k packets contending in a slot, are presented for the case of frequency-hopped spread-spectrum random-access slotted networks employing random frequency hopping patterns. These expressions are difficu... View full abstract»

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  • Analysis of a new bit tracking loop-SCCL

    Publication Year: 1992 , Page(s): 199 - 209
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    The authors propose a new bit tracking loop for biphase signals which is implemented like the maximum a posteriori probability (MAP) optimal bit synchronizer by the sample-correlate choose-largest algorithm except that the estimator is sampled and moved at most one sample each bit time. A mathematical Markovian model for analysis is used. The performance of the bit tracking loop, the mean square e... View full abstract»

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  • Performance of a nonblocking space-division packet switch with correlated input traffic

    Publication Year: 1992 , Page(s): 97 - 108
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1016 KB)  

    This work studies the performance of a nonblocking space-division packet switch in a correlated input traffic environment. In constructing the input traffic model, the author considers that each input is a time division multiaccess (TDM) link connecting to multiple sources. Every source on a link supports one call at a time. Each call experiences the alternation of ON and OFF periods, and generate... View full abstract»

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  • Design and analysis of a new self-routing network

    Publication Year: 1992 , Page(s): 171 - 177
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (596 KB)  

    A new self-routing network constructed from the sorting and the routing cells is proposed. The complexity of the new network is roughly twice as much as that of a pure banyan network. The new network can be viewed as an implementation of the load-sharing network which requires a very simple management. Its performance under uniform and nonuniform traffic models is analyzed for the unbuffered case.... View full abstract»

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  • Analysis and testing of application layer protocols with an application to FTAM

    Publication Year: 1992 , Page(s): 7 - 11
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    An experience with formal specification, analysis, and testing of an application layer protocol is presented. The ISO file, transfer, access, and management (FTAM) protocol is chosen due to its potential for widespread use. The specification language used was the ISO standard Estelle. This tool generates control and dataflow graphs of the specification and derives unparameterized test sequences fo... View full abstract»

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  • Low-delay vector excitation coding of speech at 16 kb/s

    Publication Year: 1992 , Page(s): 129 - 139
    Cited by:  Papers (5)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1044 KB)  

    The need for a 16-kb/s speech coding algorithm that has very low coding delay while achieving essentially the same high quality as the 32-kb/s adaptive differential pulse code modulation (ADPCM) standard G.721 is addressed. The authors describe low-delay vector excitation coding (LD-VXC), a new coding algorithm which provides high quality with less than 2 ms of coding delay and is robust to transm... View full abstract»

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  • Selective-repeat-ARQ schemes for broadcast links

    Publication Year: 1992 , Page(s): 12 - 19
    Cited by:  Papers (20)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (556 KB)  

    The authors propose retransmission error control schemes for broadcast channels. In their selective-repeat-ARQ (automatic repeat request) method, they incorporate some aspects of implementation that they believe were ignored by all the previous work. Based on this protocol, they also propose a type-2 hybrid ARQ scheme that uses parity retransmission. They apply the dynamic programming optimization... View full abstract»

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  • A full-duplex DLC protocol on two links

    Publication Year: 1992 , Page(s): 210 - 222
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1060 KB)  

    The authors consider a special case of multilink protocol, namely, a system consisting of two half-duplex parallel links that carry data in opposite directions between two nodes. They construct a protocol that simulates a full-duplex reliable link between the two nodes. Synchronization is achieved without resorting to the use of serial numbers. A validation proof of the protocol is provided. The d... View full abstract»

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  • Signal interception: performance advantages of cyclic-feature detectors

    Publication Year: 1992 , Page(s): 149 - 159
    Cited by:  Papers (130)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (844 KB)  

    The problem of detecting the presence of spread-spectrum phase-shift-keyed signals in variable noise and interference backgrounds is considered, and the performances of four detectors are evaluated and compared. The detectors include the optimum radiometer, the optimum modified radiometer that jointly estimates the noise level and detects the signal, and the maximum-SNR spectral-line regenerator f... View full abstract»

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  • Six-dimensional trellis-coding with QAM signal sets

    Publication Year: 1992 , Page(s): 24 - 33
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (852 KB)  

    A family of 6-D trellis-coded modulation (TCM) schemes which involve a 2-step partitioning of the constituent QAM signal alphabet is presented. With infinite constellations without shaping, the asymptotic coding gain is 3 dB for the 2-state code, 4 dB for the 4- and 8-state codes, and 5 dB for the 16- and 32-state codes which involve a smaller alphabet expansion. The authors also describe a rotati... View full abstract»

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  • A model of reservation systems

    Publication Year: 1992 , Page(s): 109 - 118
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (800 KB)  

    The author considers the performance evaluation of an advanced capacity reservation system using the CCITT defined reserved call establishment mode. A simple model for the traffic process is introduced: calls are assumed to be offered uniformly to the reservation book. The state of the system can then be described statistically in terms of the population of various types of islands of free time sl... View full abstract»

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  • A random-access algorithm for data networks carrying high-priority traffic

    Publication Year: 1992 , Page(s): 84 - 96
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1004 KB)  

    The authors consider data networks carrying mixed traffic, partially low and partially high priority. For such networks, they propose a synchronous limited sensing random access algorithm per channel, which gives a delay advantage to the high-priority traffic. The algorithm basically consists of two dynamically coupled window algorithms, one for the high and one for the low-priority packets. Assum... View full abstract»

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  • The behavior of a Costas loop in the presence of space telemetry signals

    Publication Year: 1992 , Page(s): 190 - 198
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (576 KB)  

    When the Costas loop is operated in the presence of a residual carrier space telemetry signal, the loop reconstructs its carrier reference from an input signal whose carrier component is not completely suppressed. The telemetry signal investigated in this work is generated by phase shift-keying the data onto a subcarrier and then phase modulating onto the sinusoidal carrier. The telemetry modulati... View full abstract»

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  • Data-aided synchronization of coherent CPM-receivers

    Publication Year: 1992 , Page(s): 178 - 189
    Cited by:  Papers (50)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (920 KB)  

    By means of a signal representation in a signal space spanned by a few time-limited exponential basis-functions, and data-aided maximum-likelihood techniques, novel methods for the joint and nonjoint estimation of carrier-phase and symbol-timing for general coherent CPM (continuous phase modulation) receivers are proposed. The estimators are quite simple, especially in obtaining symbol-timing. Sim... View full abstract»

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  • Reduced-state sequence detection of multilevel partial-response signals

    Publication Year: 1992 , Page(s): 3 - 6
    Cited by:  Papers (4)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (316 KB)  

    This work is concerned with the problem of designing reduced-complexity Viterbi decoders for the transmission of digital data over intersymbol interference channels. First, optimal state-grouping for constructing reduced-state trellises is presented and illustrative examples are given for multilevel transmission over partial-response channels of the type 1±Dn, (1+D)2, ... View full abstract»

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  • Exact analysis of the outage probability in multiple-user mobile radio

    Publication Year: 1992 , Page(s): 20 - 23
    Cited by:  Papers (58)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (252 KB)  

    A novel mathematical method is presented to express the outage probability for a desired radio signal received from a mobile transmitter in the presence of multiple interfering signals with combined log-normal and Rayleigh fading. In contrast to previously reported analyses, this exact method avoids approximation of the PDF of the received powers of the various signals. This is useful in determini... View full abstract»

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  • Analysis of an antijam FH acquisition scheme

    Publication Year: 1992 , Page(s): 160 - 170
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (820 KB)  

    An easily implemented matched filter scheme for acquiring hopping code synchronization of incoming frequency-hopping (FH) signals is analyzed, and its performance is evaluated for two types of jamming: partial-band noise jamming and partial-band multitone jamming. The system is designed to reduce jammer-induced false alarms. The system's matched filter output is compared to an adaptive threshold t... View full abstract»

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  • Analysis of the error performance of trellis-coded modulations in Rayleigh-fading channels

    Publication Year: 1992 , Page(s): 74 - 83
    Cited by:  Papers (182)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (836 KB)  

    This work presents an exact expression for the pairwise error event probability of trellis-coded modulation (TCM) transmitted over Rayleigh-fading channels. It includes phase shift keying (PSK) and multilevel quadrature amplitude modulation (QAM) codes, as well as coherent and partially coherent (e.g. differential, pilot tone, etc.) detection. Due to the form of the exact pairwise error event prob... View full abstract»

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  • Efficient communications using the meteor-burst channel

    Publication Year: 1992 , Page(s): 119 - 128
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (732 KB)  

    This work presents the results of a theoretical study of the meteor-burst channel which illustrates its time-varying bursty nature. In addition, the authors describe an innovative approach to data transmission over meteor-burst systems, i.e. the use of the feedback adaptive variable rate (FAVR) system which allows the maximum amount of information to be transmitted over each meteor-burst channel. ... View full abstract»

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  • Digital transmission performance of standard analog filters

    Publication Year: 1992 , Page(s): 42 - 50
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (604 KB)  

    This work analyzes the performances of Bessel, Gaussian, Butterworth, and Chebyshev (0.1-dB ripple) filters for synchronous baseband digital transmission. Numerical results showing the effects of system parameters such as signal rate, filter bandwidth, filter order, and pulse duty-cycle are presented. For rectangular inputs, linear phase filters perform better than those with nonlinear phase, from... View full abstract»

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  • The ERPC: an efficient error-resilient technique for encoding positional information or sparse data

    Publication Year: 1992 , Page(s): 140 - 148
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3840 KB)  

    In many source and data compression schemes, information relating to positions of high-energy samples or areas of importance often needs to be relayed to the decoder. The error resilient positional code (ERPC) is an efficient fixed-rate coding scheme for encoding such positional information, or, equivalently, sparse binary data patterns. It has also been designed with good channel error robustness... View full abstract»

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  • Burst error statistics of simulated Viterbi decoded BPSK on fading and scintillating channels

    Publication Year: 1992 , Page(s): 34 - 41
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (712 KB)  

    The author presents and analyzes burst error statistics of a soft-decision Viterbi decoder when the transmitted signal is encoded with the 313 (3, 1/2) or 31123 (5, 1/2) convolutional codes, modulated via coherent binary phase-shift keying (BPSK) for the additive white Gaussian noise (AWGN) channel, and subjected to slow and nonselective scintillation/fading modeled by the Nakagami-m dist... View full abstract»

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  • Performance of coded systems over fading dispersive channels

    Publication Year: 1992 , Page(s): 51 - 59
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (592 KB)  

    The authors consider a number of topics concerned with coding schemes over fading dispersive channels. They begin with comparing the performance of the energy receiver with the optimum and envelope receivers. Different coding schemes are used to improve the performance. The effect of channel spread on the performance of single-state Reed-Solomon (RS) codes is investigated. Channel information (CI)... View full abstract»

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  • Variable-rate hybrid ARQ for meteor-burst communications

    Publication Year: 1992 , Page(s): 60 - 73
    Cited by:  Papers (11)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1088 KB)  

    The authors introduce a form of automatic repeat request (ARQ), referred to as variable-rate type-I hybrid ARQ, in which the code rate varies in response to the fluctuations in the power received from a meteor trail. For one implementation, the source or the destination periodically obtains estimates of the signal power at the destination, and the source uses these estimates to select the rate of ... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

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Editor-in-Chief
Robert Schober
University of British Columbia