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Reduced Complexity I/Q Turbo Detection for Space-Time Trellis-Coded Systems

Reduced Complexity I/Q Turbo Detection for Space-Time Trellis-Coded Systems
Reduced Complexity I/Q Turbo Detection for Space-Time Trellis-Coded Systems
A reduced-complexity turbo-detection scheme, referred to here as the R-TD arrangement, is proposed for employment in space-time trellis-coded (STTC) systems using the inphase/quadrature-phase (I/Q) cancellation technique that was previously developed for single-transmitter and single-receiver systems. The R-TD scheme decomposes the received signal into its constituent I and Q signal components and detects these components separately; hence, reducingthe number of possible signal combinations to be “tested” by the detector. The R-TD scheme is capable of approachingthe performance of the conventional turbo detector (F-TD), while achievinga complexity reduction factor of 3 and 862 for a four-phase-shift-keying32-state STTC system, denoted as STTC(4,32), communicatingo ver two- and five-path Rayleigh-fadingchannels, respectively, exhibitinga symbol-spaced and equal-tap-weight channel-impulse response. In order to investigate the benefits of employing channel coding in conjunction with STTC schemes, the R-TD principle was also invoked in convolutional-coding-aided STTC schemes. It was observed that, at a given throughput, the turbo-detected “nonchannel-coded” STTC(4,32) system required a similar signal-to-noise ratio to that of the = 1 2 and constraint length = 7convolutional-coded STTC(16,16) scheme for achievingthe bit error rate (BER) of 10 . At a higher target, BER of 10 , the “nonchannel-coded” STTC(4,16) and STTC(4,32) schemes outperformed the channel-coded STTC(16,16) system by 0.8 and 2.3 dB, despite havinga factor of 19 or 11 lower complexity, respectively. Index Terms—Inphase, iterative equalization and decoding, quadrature phase, reduced complexity, serial concatenated codes, space–time trellis coding(STTC), turbo equalization/detection.
0018-9545
1278-1286
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Yeap, B.L.
235ca05f-15be-46ae-952f-604b15dbf849
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Yeap, B.L.
235ca05f-15be-46ae-952f-604b15dbf849

Hanzo, L. and Yeap, B.L. (2004) Reduced Complexity I/Q Turbo Detection for Space-Time Trellis-Coded Systems. IEEE Transactions on Vehicular Technology, 53 (4), 1278-1286.

Record type: Article

Abstract

A reduced-complexity turbo-detection scheme, referred to here as the R-TD arrangement, is proposed for employment in space-time trellis-coded (STTC) systems using the inphase/quadrature-phase (I/Q) cancellation technique that was previously developed for single-transmitter and single-receiver systems. The R-TD scheme decomposes the received signal into its constituent I and Q signal components and detects these components separately; hence, reducingthe number of possible signal combinations to be “tested” by the detector. The R-TD scheme is capable of approachingthe performance of the conventional turbo detector (F-TD), while achievinga complexity reduction factor of 3 and 862 for a four-phase-shift-keying32-state STTC system, denoted as STTC(4,32), communicatingo ver two- and five-path Rayleigh-fadingchannels, respectively, exhibitinga symbol-spaced and equal-tap-weight channel-impulse response. In order to investigate the benefits of employing channel coding in conjunction with STTC schemes, the R-TD principle was also invoked in convolutional-coding-aided STTC schemes. It was observed that, at a given throughput, the turbo-detected “nonchannel-coded” STTC(4,32) system required a similar signal-to-noise ratio to that of the = 1 2 and constraint length = 7convolutional-coded STTC(16,16) scheme for achievingthe bit error rate (BER) of 10 . At a higher target, BER of 10 , the “nonchannel-coded” STTC(4,16) and STTC(4,32) schemes outperformed the channel-coded STTC(16,16) system by 0.8 and 2.3 dB, despite havinga factor of 19 or 11 lower complexity, respectively. Index Terms—Inphase, iterative equalization and decoding, quadrature phase, reduced complexity, serial concatenated codes, space–time trellis coding(STTC), turbo equalization/detection.

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Published date: July 2004
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 260283
URI: https://eprints.soton.ac.uk/id/eprint/260283
ISSN: 0018-9545
PURE UUID: 018afb6d-ddb5-45b4-be56-5edfbe186819
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 19 Jan 2005
Last modified: 20 Jul 2019 01:26

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