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
ISSNs: 0090-6778 (print)
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 346071
Date Deposited: 10 Dec 2012 15:36
Last Modified: 30 Mar 2014 09:57
Research Funder: EPSRC
Projects:
India-UK Advanced Technology Centre (IU-ATC) in Next Generation Networks Systems and Services (Phase Two Follow-on)
Funded by: EPSRC (EP/J016748/1)
Led by: Gerard Parr
1 January 2012 to 30 June 2014
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/346071

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