A new family of unitary space-time codes with a fast parallel sphere decoder algorithm

In this paper, we propose a new design criterion and a new class of unitary signal constellations for differential space-time modulation for multiple-antenna systems over Rayleigh flat-fading channels with unknown fading coefficients. Extensive simulations show that the new codes have significantly...

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Veröffentlicht in:	IEEE transactions on information theory Jg. 52; H. 1; S. 115 - 140
Hauptverfasser:	Xinjia Chen, Kemin Zhou, Aravena, J.L.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York, NY IEEE 01.01.2006 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Algorithms Applied sciences Bit error rate Codes Coding, codes Constellations Decoders Decoding Design engineering Diversity methods Electrical engineering Exact sciences and technology Fading Fading channels Information, signal and communications theory Mathematical analysis Mathematics Modulation coding multielement antenna arrays Performance analysis Performance indices Rayleigh channels receiver diversity Receiving antennas Signal and communications theory Signal design space-time codes Telecommunications and information theory transmitter diversity Transmitters Transmitting antennas wireless communications Fading channels wireless communications Parallel algorithm Wireless telecommunication Diversity transmitter diversity Data transmission Space time Decoding space-time codes receiver diversity multielement antenna arrays Coding Antenna array
ISSN:	0018-9448, 1557-9654
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Zusammenfassung:	In this paper, we propose a new design criterion and a new class of unitary signal constellations for differential space-time modulation for multiple-antenna systems over Rayleigh flat-fading channels with unknown fading coefficients. Extensive simulations show that the new codes have significantly better performance than existing codes. We have compared the performance of our codes with differential detection schemes using orthogonal design, Cayley differential codes, fixed-point-free group codes, and product of groups and for the same bit-error rate, our codes allow smaller signal-to-noise ratio (SNR) by as much as 10 dB. The design of the new codes is accomplished in a systematic way through the optimization of a performance index that closely describes the bit-error rate as a function of the SNR. The new performance index is computationally simple and we have derived analytical expressions for its gradient with respect to constellation parameters. Decoding of the proposed constellations is reduced to a set of one-dimensional closest point problems that we solve using parallel sphere decoder algorithms. This decoding strategy can also improve efficiency of existing codes.
Bibliographie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2
ISSN:	0018-9448 1557-9654
DOI:	10.1109/TIT.2005.860421