By Topic

# IEEE Transactions on Communications

## Filter Results

Displaying Results 1 - 25 of 29

Publication Year: 2007, Page(s):C1 - C4
| PDF (48 KB)
• ### IEEE Transactions on Communications publication information

Publication Year: 2007, Page(s): C2
| PDF (41 KB)
• ### Reliability-Based Forward Recursive Algorithms for Algebraic Soft-Decision Decoding of Reed--Solomon Codes

Publication Year: 2007, Page(s):1273 - 1278
Cited by:  Papers (9)
| | PDF (163 KB) | HTML

We propose efficient forward recursive algorithms for algebraic soft-decision list decoding of Reed-Solomon codes, which utilize channel reliability information, and outperform the Koetter-Vardy (KV) algorithm with lower decoding latency. We evaluate the performance of the proposed decoding algorithms on additive white Gaussian noise and partial response channels. Simulation results show that we c... View full abstract»

• ### A New Distance Notion for PPAM Space--Time Trellis Codes for UWB MIMO Communications

Publication Year: 2007, Page(s):1279 - 1282
Cited by:  Papers (6)
| | PDF (151 KB) | HTML

We introduce a new distance notion and develop novel design criteria for optimal MN-ary pulse position amplitude modulation (PPAM) space-time trellis codes (STTC) for ultrawideband multiple-input multiple-output systems for slow and fast fading at both low and high SNR. Simulation results of the 2,2-ary PPAM STTC, constructed through set partitioning, confirm significant reduction in bit error rat... View full abstract»

• ### Outage Probability of MRC With Arbitrary Power Cochannel Interferers in Nakagami Fading

Publication Year: 2007, Page(s):1283 - 1286
Cited by:  Papers (14)
| | PDF (120 KB) | HTML

We propose a new approach to outage probability analysis of predetection maximal ratio combining (MRC) diversity reception in Nakagami-m fading channels. We generalize prior work in that we consider L independent cochannel interferers with arbitrary powers and fading parameters as well as the effects of additive white Gaussian noise (AWGN). Our approach results in a general expression for o... View full abstract»

• ### On The Weibull MGF

Publication Year: 2007, Page(s): 1287
Cited by:  Papers (6)
| | PDF (57 KB) | HTML

A closed-form expression is derived for the moment generating function of the Weibull distribution when its shape parameter is a rational number. View full abstract»

• ### Monotonicity of Likelihood Ratio of MAP Correlation Detection for OCDMA Communication

Publication Year: 2007, Page(s):1288 - 1295
| | PDF (175 KB) | HTML

In this paper, the monotonicity of the likelihood ratio used in the optimal correlation detection is established for optical code division multiple-access (OCDMA). The monotonicity property not only guarantees the optimality of the detection, it also enables us to calculate the bit-error-rate bounds for OCDMA in the presence of uncertain a priori probabilities. View full abstract»

• ### Exact Expression for the Coherence Bandwidth of Rayleigh Fading Channels

Publication Year: 2007, Page(s):1296 - 1299
Cited by:  Papers (11)
| | PDF (127 KB) | HTML

Coherence bandwidth is an important characteristic of multipath fading channels, serving as a useful tool for wireless systems design. Regardless of its importance, the determination of the coherence bandwidth, so far, has relied on an empirical formula. In this correspondence, we derive an exact coherence-bandwidth formula for Rayleigh fading channels. The use of the new formula is illustrated by... View full abstract»

• ### Soft-Input Soft-Output Equalizers for Turbo Receivers: A Statistical Physics Perspective

Publication Year: 2007, Page(s):1300 - 1307
Cited by:  Papers (8)
| | PDF (183 KB) | HTML

Many algorithms in signal processing and digital communications must deal with the problem of computing the probabilities of the hidden state variables given the observations, i.e., the inference problem, as well as with the problem of estimating the model parameters. Such an inference and estimation problem is encountered, for e.g., in adaptive turbo equalization/demodulation where soft informati... View full abstract»

• ### Augmented Belief Propagation Decoding of Low-Density Parity Check Codes

Publication Year: 2007, Page(s):1308 - 1317
Cited by:  Papers (26)
| | PDF (501 KB) | HTML

We propose an augmented belief propagation (BP) decoder for low-density parity check (LDPC) codes which can be utilized on memoryless or intersymbol interference channels. The proposed method is a heuristic algorithm that eliminates a large number of pseudocodewords that can cause nonconvergence in the BP decoder. The augmented decoder is a multistage iterative decoder, where, at each stage, the o... View full abstract»

• ### Joint Synchronization and Decoding for Photon-Limited Optical Channels: Code Design and Complexity Reduction

Publication Year: 2007, Page(s):1318 - 1324
Cited by:  Papers (3)
| | PDF (182 KB) | HTML

The problem of joint symbol synchronization and decoding of pulse position modulation (PPM) sequences in the deep-space photon-limited optical channel is considered. A new joint synchronizer and decoder for PPM on this channel is presented along with the design of codes having both good error control and synchronization properties for use with PPM signaling on this channel. The new approach presen... View full abstract»

• ### Performance Analysis of Variable-Weight Multilength Optical Codes for Wavelength–Time O-CDMA Multimedia Systems

Publication Year: 2007, Page(s):1325 - 1333
Cited by:  Papers (30)
| | PDF (524 KB) | HTML

To support multimedia services with different discrete bit-rate requirements, families of multilength optical codes, such as the carrier-hopping prime code (CHPC), extended CHPC, and multiwavelength optical orthogonal code, were recently constructed for wavelength-time optical code-division multiple-access (O-CDMA). In this paper, the performances of these multilength optical codes in a multimedia... View full abstract»

• ### On the Teletraffic Capacity of Optical CDMA

Publication Year: 2007, Page(s):1334 - 1343
Cited by:  Papers (14)
| | PDF (477 KB) | HTML

The capacity of an optical code-division multi-access (CDMA) [OCDMA] network has traditionally been defined as the number of continuously transmitting circuits supported by the network. In this paper, we use teletraffic models to determine the teletraffic capacity of a circuit-switched OCDMA network where circuits carry bursty traffic. Our analysis is independent of the OCDMA implementation or spr... View full abstract»

• ### Performance Evaluation of Distributed Wireless Networks Using Smart Antennas in Low-Rank Channel

Publication Year: 2007, Page(s):1344 - 1353
Cited by:  Papers (4)  |  Patents (1)
| | PDF (547 KB) | HTML

This paper investigates the performance of a distributed wireless network in which the nodes are equipped with fully adaptive smart antennas. The main goal is the evaluation of the influence that the geometrical configuration of the antenna array has on network throughput and packet delay. Analysis and simulations are performed to study the relationship between the geometry of the antenna array an... View full abstract»

• ### Reduced-Complexity Approach to Iterative Detection of Coded SOQPSK

Publication Year: 2007, Page(s):1354 - 1362
Cited by:  Papers (26)
| | PDF (243 KB) | HTML

We develop a reduced-complexity approach for the detection of coded shaped-offset quadrature phase-shift keying (SOQPSK), a highly bandwidth-efficient and popular constant-envelope modulation. The complexity savings result from viewing the signal as a continuous-phase modulation (CPM). We give a simple and convenient closed-form expression for a recursive binary-to-ternary precoder for SOQPSK. The... View full abstract»

• ### Performance of a New Premulticoded Multicarrier DS-CDMA System in Nakagami Fading

Publication Year: 2007, Page(s):1363 - 1373
Cited by:  Papers (1)
| | PDF (280 KB) | HTML

In this paper, we proposed a new multicarrier, direct sequence code division multiple access, the so-called premulticoded MC-DS-CDMA system. In this scheme, the basic MC-DS-CDMA system is augmented with a precoder and a multicode encoder at the transmitter. The multicode encoder is an inverse Walsh-Hadamard transform (IWHT) unit, while the precoder is a recently suggested ldquoconstant amplituderd... View full abstract»

• ### Coarse Acquisition Performance of Spectral Encoded UWB Communication Systems in the Presence of Narrow-Band Interference

Publication Year: 2007, Page(s):1374 - 1384
Cited by:  Papers (1)  |  Patents (2)
| | PDF (253 KB) | HTML

It is known that a major practical implementation challenge of ultra-wideband (UWB) receivers is the design of the coarse acquisition stage. Due to the fine time resolution of UWB signals, the acquisition stage has to acquire a large number of low-energy multipath components, with no or little knowledge of the state of the channel. In addition, the complexity further increases with the presence of... View full abstract»

• ### Performance Analysis of a Pre-BLAST-DFE Technique for MISO Channels With Decentralized Receivers

Publication Year: 2007, Page(s):1385 - 1396
Cited by:  Papers (2)
| | PDF (319 KB) | HTML

The performance of a pre-Bell Laboratories Layered Space-Time Architecture (BLAST)-decision feedback equalization (DFE) technique with Tomlinson-Harashima precoding and decentralized receivers, operating over multiple-input single-output (MISO) frequency-selective fading channels, is evaluated. First, we derive the probability of symbol error for Tomlinson-Harashima precoding operating over single... View full abstract»

• ### Achievable Rates Over Time-Varying Rayleigh Fading Channels

Publication Year: 2007, Page(s):1397 - 1406
Cited by:  Papers (19)
| | PDF (232 KB) | HTML

This paper investigates achievable rates for a wireless communication system when neither the transmitter nor the receiver has a priori knowledge of the channel state information (CSI). The dynamics of the flat fading channel are characterized by a known Doppler spectrum. Quantitative results are provided for independent and identically distributed (i.i.d.) Gaussian signals and long data blocks. E... View full abstract»

• ### On the Distribution of the Sum of Nakagami-$m$ Random Variables

Publication Year: 2007, Page(s):1407 - 1416
Cited by:  Papers (17)
| | PDF (268 KB) | HTML

In this paper, we investigate the classical problem of finding the probability density function (pdf) of the sum of Nakagami-m random variables. Exact infinite series representations are derived for the sum of three and four identically and independently distributed (i.i.d.) Nakagami-m random variables, and subsequently, it is extended to the sum of general number of random variables... View full abstract»

• ### Performance Analysis for LDPC-Coded Modulation in MIMO Multiple-Access Systems

Publication Year: 2007, Page(s):1417 - 1426
Cited by:  Papers (3)
| | PDF (479 KB) | HTML

We consider a low-density parity-check (LDPC)-coded modulation scheme in multi-input multi-output (MIMO) multiple-access systems. The receiver can be regarded as a serially concatenated iterative detection and decoding scheme, where the LDPC decoders perform the role of outer decoder and the multiuser demapper does that of the inner decoder. In this paper, we investigate the performance of the sch... View full abstract»

• ### High-Performance Cooperative Demodulation With Decode-and-Forward Relays

Publication Year: 2007, Page(s):1427 - 1438
Cited by:  Papers (423)  |  Patents (2)
| | PDF (350 KB) | HTML

Cooperative communication systems using various relay strategies can achieve spatial diversity gains, enhance coverage, and potentially increase capacity. For the practically attractive decode-and-forward (DF) relay strategy, we derive a high-performance low-complexity coherent demodulator at the destination in the form of a weighted combiner. The weights are selected adaptively to account for the... View full abstract»

• ### Optimal Transmission Range for Wireless Ad Hoc Networks Based on Energy Efficiency

Publication Year: 2007, Page(s): 1439
Cited by:  Papers (4)
| | PDF (31 KB)

The transmission range that achieves the most economical use of energy in wireless ad hoc networks is studied for uniformly distributed network nodes. By assuming the existence of forwarding neighbors and the knowledge of their locations, the average per-hop packet progress for a transmission range that is universal for all nodes is derived. This p... View full abstract»

• ### Approaching V-BLAST Capacity With Adaptive Modulation and LDPC Encoding

Publication Year: 2007, Page(s): 1439
| | PDF (31 KB)

This paper presents a practical implementation of the vertical Bell Laboratories layered space-time (V-BLAST) type system, in which the multiple-input multiple-output (MIMO) open-loop capacity can be approached with conventional scalar coding, using adaptive modulation with appropriate channel codes, e.g., low-density parity-check (LDPC) codes and optimum successive detection (OSD). The den... View full abstract»

• ### Optimizing ZF Precoders for MIMO Broadcast Systems

Publication Year: 2007, Page(s): 1439
| | PDF (31 KB)

In this paper, we develop optimization techniques for linear zero-forcing (ZF) multiple-input multiple-output (MIMO) broadcast (BC) precoders. A computationally efficient technique based on QR-update algorithms for implementing this optimization is then proposed. The application of the proposed ZF precoders and decoders to both large and small (in terms of the number of users) systems is co... 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