"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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Bibliographic Details
Published in:IEEE transactions on information theory Vol. 52; no. 4; pp. 1385 - 1398
Main Authors: Pauli, V., Lampe, L., Schober, R.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.04.2006
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
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
Online Access:Get full text
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Summary: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.
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ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2006.871048