# IEEE Transactions on Communications

## Filter Results

Displaying Results 1 - 25 of 27
• ### Decision feedback equalization of the indoor radio channel

Publication Year: 1993, Page(s):164 - 170
Cited by:  Papers (29)
| | PDF (620 KB)

The measured multipath profiles from five different indoor areas are used for the performance analysis of a binary phase shift keying (BPSK) modem with a decision feedback equalizer (DFE). The performance from the measured multipath profiles is compared with the performance predictions based on a computer simulated channel model. Both average probability of error and probability of outage are calc... View full abstract»

• ### NASA's next generation all-digital deep space network breadboard receiver

Publication Year: 1993, Page(s):246 - 257
Cited by:  Papers (10)  |  Patents (1)
| | PDF (1108 KB)

This work describes the breadboard advanced receiver (called ARX) that is currently being built for use in NASA's deep space network (DSN). This receiver has unique requirements in having to operate with very weak signals from deep space probes and provide high-quality telemetry and tracking data. The hybrid analog/digital receiver performs multiple functions, including carrier, subcarrier, and sy... View full abstract»

• ### Cyclic Wiener filtering: theory and method

Publication Year: 1993, Page(s):151 - 163
Cited by:  Papers (159)  |  Patents (10)
| | PDF (1120 KB)

Conventional time and space filtering of stationary random signals, which amounts to forming linear combinations of time translates and space translates, exploits the temporal and spatial coherence of the signals. By including frequency translates as well, the spectral coherence that is characteristic of cyclostationary signals can also be exploited. Some of the theoretical concepts underlying thi... View full abstract»

• ### Shared buffer memory switch for an ATM exchange

Publication Year: 1993, Page(s):237 - 245
Cited by:  Papers (71)  |  Patents (32)
| | PDF (796 KB)

An asynchronous transfer mode (ATM) switch architecture called a shared buffer memory switch whose output cell buffers are shared among all the output ports of the switch is proposed. Experimental measurements and a discussion about the traffic characteristics of the switch architecture are carried out to determine how much buffer memory will be reduced through buffer sharing under various traffic... View full abstract»

• ### Interference effects on Space Station Freedom and Space Shuttle orbiter Ku-band downlinks

Publication Year: 1993, Page(s):142 - 150
| | PDF (664 KB)

The Space Shuttle orbiter (SSO) Ku-band single access return (KSAR) link and the Space Station Freedom (SSF) KSAR link via the tracking and data relay satellite system (TDRSS) use the same carrier frequency. The interference between spacecraft is minimized by opposite antenna polarizations and by TDRSS antenna beam pointing, but if the SSF and SSO are in close proximity, it is expected th... View full abstract»

• ### High-dimensionality shared-medium photonic switch

Publication Year: 1993, Page(s):224 - 236
Cited by:  Papers (9)  |  Patents (1)
| | PDF (1280 KB)

A space-division photonic switch which has the potential to achieve high dimensionality is presented. The proposed switch, which resembles a collapsed network, does not use optical crosspoints; rather a dedicated path is provided for all input/output port connections on a common high-bandwidth transmission medium. This eliminates the restrictions imposed by 2×2 switching elements in classica... View full abstract»

• ### Analysis of the M/G/1 queue under a combined preemptive/nonpreemptive priority discipline

Publication Year: 1993, Page(s):132 - 141
Cited by:  Papers (34)
| | PDF (824 KB)

The authors propose a combined preemptive/nonpreemptive priority discipline. When a high-priority job arrives at the system while a low-priority job is being in service, the high-priority job will be served immediately and the low-priority job will go back to the head of the queue of its class, if a discretion rule for preemption is satisfied. Otherwise, the high-priority job waits in queue until ... View full abstract»

• ### Sharp approximate models of deflection routing in mesh networks

Publication Year: 1993, Page(s):210 - 223
Cited by:  Papers (65)  |  Patents (2)
| | PDF (1196 KB)

Deflection routing is a simple, decentralized, and adaptive method for routing data packets in communication networks. The focus of this work is on deflection routing in the Manhattan street network (a two-dimensional directed mesh), although the analytic approach should apply to any regular network. Two approximate performance models that give sharp estimates of the steady-state throughput and th... View full abstract»

• ### Concatenated multilevel block coded modulation

Publication Year: 1993, Page(s):41 - 49
Cited by:  Papers (12)  |  Patents (2)
| | PDF (832 KB)

Encoding and decoding schemes for concatenated multilevel block codes are presented. By one of these structures, a real coding gain of 5.6-7.4 dB for the bit error range of 10-6 to 10-9 is achieved for transmission through the additive white Gaussian noise channel. Also, a rather large asymptotic coding gain is obtained. The new coding schemes have very low decoding complexit... View full abstract»

• ### Spectral efficiency of optical FDM systems impaired by phase noise

Publication Year: 1993, Page(s):125 - 131
Cited by:  Papers (8)
| | PDF (644 KB)

The required frequency spacings between channels in an optical frequency division multiplexing (FDM) network are considered. The minimum permissible spacings consistent with meeting bit error rate (BER) objectives are derived. The assumed transmission uses on-off keying (OOK), at a data rate 1/T (in bits per second), via external modulation of a laser source having linewidth β (in he... View full abstract»

• ### Performance of robust metrics with convolutional coding and diversity in FHSS systems under partial-band noise jamming

Publication Year: 1993, Page(s):200 - 209
Cited by:  Papers (12)
| | PDF (732 KB)

The performance of robust metrics (metrics that can be computed from the outputs of the matched filters only) with convolutional coding and diversity under worst-case partial-band noise jamming is analyzed. Both binary and dual-k convolutional codes employing these metrics with diversity are compared via Union-Chernoff bounds. The performances of metrics considered in the literature that ... View full abstract»

• ### Application of classical cosine series window functions to full response signaling offset quadrature binary modulation systems

Publication Year: 1993, Page(s):11 - 15
Cited by:  Papers (6)
| | PDF (356 KB)

It is proposed that classical cosine series window functions be applied to finite symbol duration quadrature binary modulation systems as pulse shapes in the interest of increasing the spectral confinement of the resulting modulated signals. The respective modulation systems are analyzed in terms of modulated signal envelope uniformity, spectral confinement, and bit error rate in the presence of w... View full abstract»

• ### Performance evaluation of the generalized type-II hybrid ARQ scheme with noisy feedback on Markov channels

Publication Year: 1993, Page(s):32 - 40
Cited by:  Papers (8)  |  Patents (1)
| | PDF (612 KB)

The generalized type-II hybrid automatic repeat request (ARQ) scheme on Markov channels is examined in order to study the effect of feedback channel errors on the performance of ARQ systems. It is shown that it is possible to derive expressions for certain critical performance parameters, such as the throughput efficiency, the probabilities of packet loss, undetected error, and correct delivery. T... View full abstract»

• ### On self-routing in Clos connection networks

Publication Year: 1993, Page(s):121 - 124
Cited by:  Papers (10)
| | PDF (460 KB)

A self-routing connection network is a switching device where the routing of each switch can be determined in terms of the destination addresses of its inputs alone, i.e. independent of the routing information regarding the other switches in the network. One family of connection networks that were considered in the literature for self-routing are Clos networks. Earlier studies indicate that some C... View full abstract»

• ### Optimum soft decision demodulation for ISI channels

Publication Year: 1993, Page(s):83 - 89
Cited by:  Papers (7)  |  Patents (2)
| | PDF (504 KB)

Two different methods of soft-decision demodulation for channels with finite intersymbol interference (ISI) in the presence of additive white Gaussian noise (AWGN) are analyzed. In both schemes, the cutoff rate R0 of the discrete channel created by the demodulator output quantization is chosen as the design criterion. Expressions for the optimal thresholds of the quantizer asso... View full abstract»

• ### Adaptive entropy-coded pruned tree-structured predictive vector quantization of images

Publication Year: 1993, Page(s):171 - 185
Cited by:  Papers (6)
| | PDF (1644 KB)

Simpler versions of a previously introduced adaptive entropy-coded predictive vector quantization (PVQ) scheme where the embedded entropy constrained vector quantizer (ECVQ) is replaced by a pruned tree-structured VQ (PTSVQ) are described. The resulting encoding scheme is shown to result in drastically reduced complexity at only a small cost in performance. Coding results for selected real-world i... View full abstract»

• ### Multimode modulation and coding of QAM

Publication Year: 1993, Page(s):1 - 6
Cited by:  Papers (4)
| | PDF (372 KB)

A general-purpose modulation and coding implementation that is based on the quadrature amplitude modulation (QAM) family of modulation is described. The technique utilizes the superposed' property of certain rectangular QAM constellations, along with the fact that optimal four-state trellis codes for such constellations are essentially identical, to provide a single modem architecture capable of ... View full abstract»

• ### Bandwidth efficient concatenated coding schemes for fading channels

Publication Year: 1993, Page(s):50 - 61
Cited by:  Papers (25)  |  Patents (2)
| | PDF (892 KB)

Concatenated codes consisting of trellis inner codes and Reed-Solomon outer codes are considered to achieve large coding gains with small bandwidth expansion in the presence of frequency-nonselective slow Rician fading. Both errors-only and errors-erasures decoding algorithms for outer codes are applied. New upper bounds on bit error probability performance in the presence of fading are obtained a... View full abstract»

• ### Traffic sensitive algorithms and performance measures for the generation of self-organizing radio network schedules

Publication Year: 1993, Page(s):16 - 21
Cited by:  Papers (18)  |  Patents (2)
| | PDF (324 KB)

The generation of transmission schedules for self-organizing radio networks by traffic-sensitive algorithms is described. A centralized Traffic' algorithm that can be used as a performance benchmark is presented. Also described is a distributed `degree' algorithm that is a traffic-sensitized version of an algorithm developed by A. Ephremides and T. Truong (1990). Two performance measures for comp... View full abstract»

• ### Nested sliding window protocols with packet fragmentation

Publication Year: 1993, Page(s):99 - 109
Cited by:  Papers (5)  |  Patents (1)
| | PDF (828 KB)

A single-hop OSI structured network with multiple layers of sliding window flow control and packet fragmentation between layers is analyzed. An approximation algorithm is presented to hierarchically reduce the network to a single queue whose performance characteristics represent the original network. Network transmission characteristics are restricted to Erlang distributions. Validation against ex... View full abstract»

• ### Variable rate vector quantization for speech, image, and video compression

Publication Year: 1993, Page(s):186 - 199
Cited by:  Papers (35)  |  Patents (1)
| | PDF (1544 KB)

The performance of a vector quantizer can be improved by using a variable-rate code. Three variable-rate vector quantization systems are applied to speech, image, and video sources and compared to standard vector quantization and noiseless variable-rate coding approaches. The systems range from a simple and flexible tree-based vector quantizer to a high-performance, but complex, jointly optimized ... View full abstract»

• ### Performance of combined trellis coded modulation and nonlinear cancellation

Publication Year: 1993, Page(s):7 - 10
Cited by:  Papers (6)  |  Patents (1)
| | PDF (304 KB)

The performance of nonlinear cancellation schemes is limited by the accuracy of tentative decisions. This correspondence analyzes the performance of combined trellis coded modulation and nonlinear cancellation. A scheme is proposed to make use of the redundancy of the code. It is shown that performance close to optimum can be achieved with this scheme View full abstract»

• ### Maximum-likelihood block detection of noncoherent continuous phase modulation

Publication Year: 1993, Page(s):90 - 98
Cited by:  Papers (56)  |  Patents (7)
| | PDF (620 KB)

The authors examine maximum-likelihood block detection of uncoded full response continuous phase modulation (CPM) over an additive white Gaussian noise (AWGN) channel. Both the maximum-likelihood metrics and the bit error probability performances of the associated detection algorithms are considered. The special and popular case of minimum-shift-keying (MSK) corresponding to h=0.5 and con... View full abstract»

• ### Performance of a TDMA portable radio system using a cyclic block code for burst synchronization and error detection

Publication Year: 1993, Page(s):22 - 31
Cited by:  Papers (5)  |  Patents (9)
| | PDF (760 KB)

A combined burst synchronization and error detection scheme is studied for a time-division multiple access (TDMA) portable radio system. Analysis, computer simulation, and experimental results of the false acceptance rate of the system using the combined scheme are presented. It is found that for a (161,147) code used in this study, which is capable of correcting ±6-b sync slippage, the err... View full abstract»

• ### MetaRing-a full-duplex ring with fairness and spatial reuse

Publication Year: 1993, Page(s):110 - 120
Cited by:  Papers (127)  |  Patents (23)
| | PDF (968 KB)

The design principles of a ring network with spatial bandwidth reuse are described. A distributed fairness mechanism for this architecture, which uses low latency hardware control signals, is presented. The basic fairness mechanism can be extended for implementing multiple priority levels and integration of asynchronous with synchronous traffic. The ring is full-duplex and has two basic modes of o... View full abstract»

## Aims & Scope

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

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas