Performance of trellis-coded modulation for equalized multipath fading ISI channels

Hamied, Khalid; Stuber, G.L.

doi:10.1109/25.350269

Cited by 30 publications

(21 citation statements)

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“…This is a result of the fact that we assume separate decoding and equalization in our implementation. A similar observation has been reported in [35], [36] in the context of conventional TCM systems.…”

Section: )supporting

confidence: 64%

“…Using (36), we can write (34) and (35) in matrix form a (37) Since is an orthogonal matrix of size , we can multiply (37) (without loss of optimality) by (38) The resulting output streams are now decoupled allowing us to write each output sequence as (39) where is a noise vector with each entry still Gaussian with zero-mean and variance of per dimension. After the decoupling, standard SISO equalizers can be used for the detection of data streams , .…”

Section: D-sc Stbcmentioning

confidence: 99%

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Equalization Techniques for Distributed Space-Time Block Codes With Amplify-and-Forward Relaying

Mheidat

Uysal

Al-Dhahir

2007

IEEE Trans. Signal Process.

145

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Abstract-In this paper, we investigate equalization methods for cooperative diversity schemes over frequency-selective fading channels. Specifically, we consider three equalization schemes proposed originally for conventional space-time block codes (STBC) [ -to-noise ratio (SNR) for the underlying links, our performance analysis demonstrates that D-TR-STBC, D-SC-STBC, andcoded D-OFDM-STBC schemes are able to achieve a maximum diversity order of min( 1 3 ) + 2 + 2 where 1 , 2 , and 3 are the channel memory lengths for , , and links, respectively. This illustrates that the minimum of the multipath diversity orders experienced in and links becomes the performance bottleneck for the relaying path. For the case of a nonfading relaying path where line-of-sight propagation is possible in either one of these underlying links, we demonstrate that diversity orders of 1 + 2 + 2 and 3 + 2 + 2 are achievable assuming nonfading and links, respectively. An extensive Monte Carlo simulation study is presented to corroborate the analytical results and to provide detailed performance comparisons among the three candidate equalization schemes.Index Terms-Cooperative diversity, distributed space-time block coding (STBC), equalization, fading channels, pairwise error probability.

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Section: )supporting

confidence: 64%

Section: D-sc Stbcmentioning

confidence: 99%

Equalization Techniques for Distributed Space-Time Block Codes With Amplify-and-Forward Relaying

Mheidat

Uysal

Al-Dhahir

2007

IEEE Trans. Signal Process.

145

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“…OF THE WORK T HE exploitation of trellis-coded modulation (TCM) codes for high-throughput transmissions over bandwidth-limited time-variant wireless intersymbol interference (ISI) channels requires the utilization of adaptive receivers performing equalization and decoding, and in principle, these two tasks can be accomplished by resorting to "separate" or "combined" receiving schemes 1 [7], [10], [11, Ch. 10].…”

Section: Overview On Published Results and Motivationsmentioning

confidence: 99%

“…2) On the basis of the presented bounds, criteria for the optimization of TCM codes are developed and guidelines for the effective design of good TCM schemes are provided. These last are quite different from the corresponding ones suited for MLS-based receivers [8]- [10], especially when the maximum decision delay allowed the overall transmission system must be also accounted for by the code-design procedure. The remainder of the work is organized as follows.…”

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confidence: 88%

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On the performance limits of TCM in fast-fading multipath channels with combined equalization/decoding

Baccarelli

2000

IEEE Trans. Commun.

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Abstract-In this contribution we present some analytical performance bounds that point out the key parameters dominating the performance of symbol-by-symbol combined-type maximum a posteriori equalizers/decoders for trellis-coded modulation (TCM) transmissions over fast-faded intersymbol-interference-impaired Rayleigh-channels with diversity reception. Guidelines are also provided for the design of good TCM codes matched to the statistical features of the multipath transmission links and application examples are developed that support the actual effectiveness of the presented results.Index Terms-Bhattacharyya bound, fast-variant multipath wireless channels, SbS equalization/decoding, TCM design. I. OVERVIEW ON PUBLISHED RESULTS AND MOTIVATIONSOF THE WORK T HE exploitation of trellis-coded modulation (TCM) codes for high-throughput transmissions over bandwidth-limited time-variant wireless intersymbol interference (ISI) channels requires the utilization of adaptive receivers performing equalization and decoding, and in principle, these two tasks can be accomplished by resorting to "separate" or "combined" receiving schemes 1 [7], [10], [11, Ch. 10].Although in the "separate" schemes interleaving can be easily performed and, under the (overoptimistic) assumption of perfect equalization, standard codes designed for perfectly interleaved ISI-free channels can be employed [2, Ch. 9], [11, Ch. 7], nevertheless this attractive feature of the separate-type schemes is really counterbalanced by some important drawbacks pointed out, for example, in [7, Sec. I], [10, Sec. III-A], and [1, pp. 344, 392].Therefore, since in principle the optimal receiver should combine the equalization and decoding operations, various forms of combined-type maximum-likelihood sequence (MLS) equal- The author is with the INFO-COM Department, University of Rome "La Sapienza," 00184 Rome, Italy.Publisher Item Identifier S 0090-6778(00)10902-X.1 The relative merits of "combined" and "separate" schemes are tested in the recent contribution [7] where results about the comparison between several adaptive receiving architectures are also reported. The issue of the implementation complexity is also addressed in [7, Sec. IV], whereas in [7, Sec. V.B] we present numerical plots testing the actual effectiveness of "combined" and "separate" adaptive detectors for some GSM-type wireless channels. The effects of interleaving on the reliability of coded systems with "separate" adaptive equalization/decoding are also tested in The main goals of this contribution are to give insight into the key parameters dominating the performance of multipath impaired TCM schemes decoded via "combined" symbol-by-symbol (SbS) maximum a posteriori (MAP) minimum-error-probability equalizers/decoders [7], [12] and, then, provide effective guidelines for their optimized design. In this regard, we recall that maximum-likelihood sequence estimators (MLSEs) and SbS-MAP detectors are both optimal but under different performance criteria; in fact, MLSEs minimize the sequence-error pr...

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2013

Wireless Communications

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Performance of trellis-coded modulation for equalized multipath fading ISI channels

Cited by 30 publications

References 21 publications

Equalization Techniques for Distributed Space-Time Block Codes With Amplify-and-Forward Relaying

Equalization Techniques for Distributed Space-Time Block Codes With Amplify-and-Forward Relaying

On the performance limits of TCM in fast-fading multipath channels with combined equalization/decoding

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