Near-Capacity Turbo Coded Soft-decision Aided DAPSK/Star-QAM for Amplify-and-Forward based Cooperative Communications


Liang, Dandan, Ng, Soon Xin and Hanzo, Lajos (2013) Near-Capacity Turbo Coded Soft-decision Aided DAPSK/Star-QAM for Amplify-and-Forward based Cooperative Communications IEEE Transactions on Communications

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Description/Abstract

Abstract—Multilevel Differential Amplitude and Phase-Shift
Keying (DAPSK) schemes do not require any channel estimation, which results in low complexity. In this treatise we derive the soft-output probability formulas required for a soft-decision based demodulation of high-order DAPSK, in order to facilitate iterative detection by exchanging extrinsic information with an outer Turbo Code (TC). Furthermore, when the TC block size is increased, the system operates closer to the channel capacity. Compared to the identical-throughput TC assisted 64-ary Differential Phase-Shift Keying (64-DPSK) scheme, the 4-ring based TC assisted 64-ary DAPSK arrangement has a power-efficiency improvement of 2.3 dB at a bit error rate (BER) of 10?5 . Furthermore, when the TC block size is increased, the system operates closer to the channel capacity. More specifically, when using a TC block length of 400 modulated symbols, the 64 DAPSK (4, 16) scheme is 7.56 dB away from its capacity curve, while it had a reduced gap as low as 2.25 dB, when using a longer TC block length of 40 000 modulated symbols. Finally, as a novel application example, the soft-decision M-DAPSK scheme was incorporated into an Amplify-and-Forward (AF) based cooperative communication system, which attains another
4.5 dB SNR improvement for a TC block length of 40 000
modulated symbols.

Item Type: Article
Organisations: Southampton Wireless Group
ePrint ID: 346071
Date :
Date Event
2013Published
Date Deposited: 10 Dec 2012 15:36
Last Modified: 17 Apr 2017 16:17
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/346071

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