Title :
On space-time block codes for linear MMSE decoders
Author :
Geng, Jifeng ; Mitra, Urbashi
Author_Institution :
Univ. of Southern California, Los Angeles, CA, USA
Abstract :
Space-time coding (STC) promises improved performance in wireless fading channels. STC has been introduced successfully to direct-sequence code-division-multiple-access (DS-CDMA) systems. The large complexity of the jointly optimal multiuser space-time block decoder motivates the consideration of suboptimal decoders. We consider a two-stage suboptimal approach: a linear MMSE equalizer suppresses multiple access interference and spatial intersymbol interference, and a mapper maps the soft output to a valid space-time block code (STBC). The asymptotic behavior of two decoders is analyzed as the SNR and the number of receive antennas increases. Given the suboptimal scheme, we consider the task of finding STBCs which optimize the performance of the suboptimal decoder.
Keywords :
block codes; code division multiple access; decoding; equalisers; fading channels; interference suppression; intersymbol interference; least mean squares methods; space-time codes; DS-CDMA; SNR; asymptotic behavior; direct-sequence code-division-multiple-access; interference suppression; linear MMSE decoders; linear MMSE equalizer; multiple access interference; receive antennas; space-time block codes; spatial intersymbol interference; two-stage suboptimal approach; wireless fading channels; Block codes; Decoding; Equalizers; Fading; Gaussian channels; Multiaccess communication; Multiple access interference; Receiving antennas; Transmitters; Vectors;
Conference_Titel :
Information Theory, 2002. Proceedings. 2002 IEEE International Symposium on
Print_ISBN :
0-7803-7501-7
DOI :
10.1109/ISIT.2002.1023689
