# IEEE Transactions on Communications

## Filter Results

Displaying Results 1 - 25 of 32

Publication Year: 2006, Page(s):c1 - c4
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• ### IEEE Transactions on Communications publication information

Publication Year: 2006, Page(s): c2
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• ### A new cycle-based joint permutor design for multiple turbo codes

Publication Year: 2006, Page(s):961 - 965
Cited by:  Papers (3)
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In this letter, a permutor design parameter, called the weight of a cycle through J-1 permutation matrices, for multiple turbo codes is introduced. Analogously to the single-permutor case of conventional turbo codes, we show the connection of the new parameter to the minimum distance of special classes of multiple turbo codes. In addition, simulation results are presented for multiple turbo codes ... View full abstract»

• ### Performance of UWB multiple-access impulse radio systems with antenna array in dense multipath environments

Publication Year: 2006, Page(s):966 - 970
Cited by:  Papers (19)
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In this letter, the influence of temporal and spatial diversities on the performance of ultra-wideband time-hopping pulse-position modulated multiple-access impulse radio (IR) systems is analyzed. We investigate how an antenna array can be used at the receiver to improve the bit-error rate (BER) performance and can cope with the effects of multiple-access interference of IR system in dense multipa... View full abstract»

• ### SMC-based blind detection for DS-CDMA systems over multipath fading channels

Publication Year: 2006, Page(s):971 - 974
Cited by:  Papers (3)
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This letter derives a computationally efficient sequential Monte Carlo solution for blind detection of direct-sequence code-division multiple-access systems over multipath fading channels by decomposing the observed data into a number of signal components. Then the parameters of each component can be estimated by the sequential importance sampling and Kalman filtering. In comparison with other sim... View full abstract»

• ### On capacity of quality-based channel-state reporting in mobile systems with greedy transmission scheduling

Publication Year: 2006, Page(s):975 - 979
Cited by:  Papers (18)  |  Patents (6)
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Greedy transmission scheduling achieves great capacity by maximally exploiting independent time-varying channels across different mobile users. The improvement in capacity, however, depends on the degree of completeness of the channel quality information (CQI) fed back from the receiver to the transmitter. To be motivated by an insight that too many CQI feedbacks may rather impair the capacity gai... View full abstract»

• ### Comments on "Wide-sense nonblocking multicast Log/sub 2/(N,m,p) Networks"

Publication Year: 2006, Page(s):980 - 982
Cited by:  Papers (8)
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Recently, Hwang and Lin derived nonblocking conditions for multicast connections in Log2(N,m,p) networks. They improved some conditions obtained earlier by Kabacinacuteski and Danilewicz. In this letter, we identify some inaccuracy in present results concerning wide-sense nonblocking Log2(N,m,p) multicast networks, and give the correct results View full abstract»

• ### Outer-product matrix representation of optical orthogonal codes

Publication Year: 2006, Page(s):983 - 989
Cited by:  Papers (7)
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In this letter, we introduce a whole new approach in defining and representing optical orthogonal codes (OOCs), namely, outer-product matrix representation. Instead of applying commonly used approaches based on inner product to construct OOC codes, we use the newly defined approach to obtain a more efficient algorithm in constructing and generating OOC codes. The outer-product matrix approach can ... View full abstract»

• ### Diversity analysis of single and multiple beamforming

Publication Year: 2006, Page(s):990 - 993
Cited by:  Papers (68)
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In this letter, we study two techniques, known as single and multiple beamforming, to exploit the perfect channel state information (CSI) available both at the transmitter and the receiver of a multiantenna wireless system. Assuming N and M are the number of antennas at the transmitter and the receiver, respectively, we show that single beamforming (transmission of a single symbol from all transmi... View full abstract»

• ### On unequal error protection LDPC codes based on plotkin-type constructions

Publication Year: 2006, Page(s):994 - 1005
Cited by:  Papers (34)
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We introduce a new family of unequal error protection (UEP) codes, based on low-density parity-check (LDPC) component codes and Plotkin-type constructions. The codes are decoded iteratively in multiple stages, and the order of decoding determines the level of error protection. The level of UEP among the code bits is also influenced by the choice of the LDPC component codes and by some new reliabil... View full abstract»

• ### Systematic redundant residue number system codes: analytical upper bound and iterative decoding performance over AWGN and Rayleigh channels

Publication Year: 2006, Page(s):1006 - 1016
Cited by:  Papers (12)
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The novel family of redundant residue number system (RRNS) codes is studied. RRNS codes constitute maximum-minimum distance block codes, exhibiting identical distance properties to Reed-Solomon codes. Binary to RRNS symbol-mapping methods are proposed, in order to implement both systematic and nonsystematic RRNS codes. Furthermore, the upper-bound performance of systematic RRNS codes is investigat... View full abstract»

• ### Coding performance of hybrid ARQ schemes

Publication Year: 2006, Page(s):1017 - 1029
Cited by:  Papers (109)  |  Patents (5)
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We develop a unified performance metric and detailed analysis for hybrid automatic repeat request (HARQ) schemes based on incremental redundancy (IR) and Chase combining (CC). The general result is applicable to both symbol-based and bit-interleaved coded modulations, to HARQ processes based on rateless and fixed-rate mother codes, and IR schemes with and without a self-decodability restriction. T... View full abstract»

• ### A low-complexity method for fixed-rate entropy-constrained vector quantization

Publication Year: 2006, Page(s):1030 - 1037
Cited by:  Papers (1)
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This paper describes a new approach to fixed-rate entropy-constrained vector quantization (FEVQ) for stationary memoryless sources where the structure of codewords are derived from a variable-length scalar quantizer. We formulate the quantization search operation as a zero-one integer-optimization problem, and show that the resulting integer program can be closely approximated by solving a simple ... View full abstract»

• ### Joint estimation of carrier frequency offset and statistical parameters of the multipath fading channel

Publication Year: 2006, Page(s):1038 - 1048
Cited by:  Papers (12)
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In this paper, we focus on the joint estimation of the carrier frequency offset and statistical parameters of the multipath mobile channel. By modeling the multipath fading channel with a complex bandpass autoregressive (AR) model, we show how the estimates for the frequency offset, Doppler spread, and power profile of the multipath channel can be extracted from the estimated complex AR coefficien... View full abstract»

• ### Exact evaluation of bit- and symbol-error rates for arbitrary 2-D modulation and nonuniform signaling in AWGN channel

Publication Year: 2006, Page(s):1049 - 1056
Cited by:  Papers (25)  |  Patents (1)
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Exact evaluation of bit- and symbol-error rates in a 2-D constellation is a fundamental problem of digital communications, which only for particular modulations and/or bits-to-symbol mapping has closed-form solutions. Here, we propose a general, numerically efficient algorithmic method, which yields the exact results for arbitrary modulation symbols' set and arbitrary bits-to-symbol mapping, and w... View full abstract»

• ### Narrowband interference suppression in time-hopping impulse radio ultra-wideband communications

Publication Year: 2006, Page(s):1057 - 1067
Cited by:  Papers (53)
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Ultra-wideband (UWB) technology has been considered an innovative solution for future short-range high-speed wireless communications. Interference suppression is important for the UWB devices to operate over spectrum occupied by narrowband systems. In this paper, the use of a notch filter in time-hopping impulse radio (TH-IR) for UWB communication is considered, where a Gaussian monopulse is emplo... View full abstract»

• ### Detectors and asymptotic analysis for bandwidth-efficient space-time multiple-access systems

Publication Year: 2006, Page(s):1068 - 1080
Cited by:  Papers (3)
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In this paper, a narrowband multiple-channel transmission scheme with multiple transmit antennas is proposed and analyzed. The channelization is based on space-time signature matrices, which do not expand bandwidth, unlike conventional schemes such as code-division or time-division multiplexing. The channels can be used by multiple independent users in an uplink or downlink scenario (multiple acce... View full abstract»

• ### Optimal periodic training signal for frequency offset estimation in frequency-selective fading channels

Publication Year: 2006, Page(s):1081 - 1096
Cited by:  Papers (60)
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This paper addresses an optimal periodic training signal design for frequency offset estimation in frequency-selective multipath Rayleigh fading channels. For a fixed transmitted training signal energy within a fixed-length block, the optimal periodic training signal structure (the optimal locations of identical training subblocks) and the optimal training subblock signal are presented. The optima... View full abstract»

• ### Downlink transmission of broadband OFCDM Systems-part II: effect of Doppler shift

Publication Year: 2006, Page(s):1097 - 1108
Cited by:  Papers (39)
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The orthogonal frequency and code division multiplexing (OFCDM) system with 2-D spreading (time- and frequency-domain spreading) is becoming a promising candidate for future broadband wireless communication systems. OFCDM is more attractive than orthogonal frequency-division multiplexing (OFDM) both by introducing frequency-domain spreading for frequency diversity provision and time-domain spreadi... View full abstract»

• ### V-BLAST without optimal ordering: analytical performance evaluation for Rayleigh fading channels

Publication Year: 2006, Page(s):1109 - 1120
Cited by:  Papers (35)
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The Bell Labs layered space-time (BLAST) algorithm is simple, and hence, a popular choice for a multiple-input multiple-output (MIMO) receiver. Its bit-error rate (BER) performance has been studied mainly using numerical (Monte Carlo) techniques, since exact analytical evaluation presents serious difficulties. Close examination of the problem of BLAST BER performance analysis reveals that the majo... View full abstract»

• ### On channel orthogonalization using space-time block coding with partial feedback

Publication Year: 2006, Page(s):1121 - 1130
Cited by:  Papers (11)
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Orthogonal space-time block codes (OSTBCs) yield full diversity gain even while requiring only a linear receiver. Such full-rate (rate-one) orthogonal designs are available for complex symbol constellations only for N=2 transmit antennas. In this paper, we propose a new family of full-rate space-time block codes (STBCs) using a single parameter feedback for communication over Rayleigh fading chann... View full abstract»

• ### Subchannel grouping and statistical waterfilling for vector block-fading channels

Publication Year: 2006, Page(s):1131 - 1142
Cited by:  Papers (14)
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In this paper, capacity limits and power-control schemes are assessed for the block-fading (BF) additive white Gaussian noise (AWGN) channels under the assumption that the channel state information (CSI) is known at both the transmitter and the receiver sides. Two notions of channel capacity limits are considered in this paper, including the ergodic capacity for transmission without delay constrai... View full abstract»

• ### Design, Simulation, and Testing of a CMOS Analog Decoder for the Block Length-40 UMTS Turbo Code

Publication Year: 2006, Page(s): 1143
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In this paper, we present an all-analog implementation of the rate-1/3, block length 40, UMTS turbo decoder. The prototype was designed and fabricated in a 0.35$mu$m CMOS technology and operates at 3.3 V. We also introduce a discrete-time first-order model for analog decoders which allows fast BER simulations, while taking into account circuit transient behavior and component mismatch. ... View full abstract»

• ### Gear-Shift Decoding

Publication Year: 2006, Page(s): 1143
Cited by:  Papers (5)
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This paper considers a class of iterative message-passing decoders for low-density parity-check codes in which the decoder can choose its decoding rule from a set of decoding algorithms at each iteration. Each available decoding algorithm may have different per-iteration computation time and performance. With an appropriate choice of algorithm at each iteration, overall decoding latency can be red... View full abstract»

• ### Applications of Algebraic Soft-Decision Decoding of Reed&#8211;Solomon Codes

Publication Year: 2006, Page(s): 1143
Cited by:  Patents (1)
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Efficient soft-decision decoding of Reed–Solomon codes is made possible by the Koetter–Vardy (KV) algorithm which consists of a front-end to the interpolation-based Guruswami–Sudan list decoding algorithm. This paper approaches the soft-decision KV algorithm from the point of view of a communications systems designer who wants to know what benefits the algorithm can give, and how... 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.

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## Meet Our Editors

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