"Turbo DPSK" using soft multiple-symbol differential sphere decoding

Coded interleaved differential M-ary phase-shift keying (M-DPSK) with iterative decoding, the so-called "Turbo DPSK," is known as a power-efficient transmission format. Due to the rotational invariance of DPSK, it particularly enables detection without channel state information (CSI). Howe...

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Vydáno v:	IEEE transactions on information theory Ročník 52; číslo 4; s. 1385 - 1398
Hlavní autoři:	Pauli, V., Lampe, L., Schober, R.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York, NY IEEE 01.04.2006 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	Additive white noise Applied sciences AWGN Channel state information Channels Codes Coding, codes Complexity Decoders Decoding Detection, estimation, filtering, equalization, prediction Differential phase-shift keying (DPSK) Differential quadrature phase shift keying Exact sciences and technology extrinsic information transfer (EXIT) charts Information analysis Information theory Information, signal and communications theory Iterative algorithms Iterative decoding Iterative methods maximum a posteriori decoding Modulation, demodulation Modules Normal distribution Output Phase shift keying Rayleigh channels Rayleigh-fading channels Search problems Searching Signal and communications theory Signal, noise sphere decoding Telecommunications and information theory Performance evaluation Parameter estimation AWGN extrinsic information transfer (EXIT) charts Time variation Iterative decoding sphere decoding Codec M ary modulation Channel estimation Rotational invariance A posteriori estimation Differential phase shift keying maximum a posteriori decoding High rate transmission Fading channels Channel capacity Rayleigh channels Transfer characteristic Information transmission Rayleigh-fading channels Posterior probability Simulation Interleaved codes Differential phase-shift keying (DPSK)
ISSN:	0018-9448, 1557-9654
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Popis
Shrnutí:	Coded interleaved differential M-ary phase-shift keying (M-DPSK) with iterative decoding, the so-called "Turbo DPSK," is known as a power-efficient transmission format. Due to the rotational invariance of DPSK, it particularly enables detection without channel state information (CSI). However, the soft-input soft-output (SISO) component decoder for DPSK is the computational bottleneck if performance close to the ideal case of perfect CSI is desired. In this paper, we take a fresh look at SISO decoding without CSI and apply sphere decoding (SD) to reduce complexity. In particular, we devise a maximum a posteriori probability (MAP) multiple-symbol differential sphere decoder (MSDSD) which efficiently solves the high-dimensional search problem inherent to detection without CSI. Together with a soft-output generation device the MAP-MSDSD algorithm forms a new SISO-MSDSD module for iterative decoding. We analyze the extrinsic information transfer (EXIT) characteristic of the novel module, by means of which we are able to design powerful encoder and decoder structures. For, respectively, the additive white Gaussian noise (AWGN) and the continuously time-varying Rayleigh-fading channel without CSI these designs operate within 1.7-1.9 and 2.3-2.5 dB of channel capacity assuming perfect CSI. These figures compare favorably with results available in the literature, especially for reasonably high data rates of 1-2 bit/channel use. Simulation studies of the average and the maximum complexity required by SISO-MSDSD demonstrate the advantageous performance versus complexity tradeoff of our approach.
Bibliografie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-2 content type line 23
ISSN:	0018-9448 1557-9654
DOI:	10.1109/TIT.2006.871048