A low-complexity noncoherent iterative space-time demodulator

Authors:
Ruey-Yi Wei;Yu-Wei Hsu;Chih-Chong Pan
Affiliations:
Department of Communication Engineering, National Central University, Jhongli, Taiwan, R.O.C.;Compal Communications, Inc., Taipei, Taiwan, R.O.C. and Department of Communication Engineering, National Central University, Jhongli, Taiwan, R.O.C.;ZyXEL Communications Corporation, Hsin-Chu, Taiwan, R.O.C. and Department of Communication Engineering, National Central University, Jhongli, Taiwan, R.O.C.
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

Turbo coded unitary space-time modulation (USTM) can provide large coding gain as compared to uncoded USTM. Because the noncoherent space-time maximum a posteriori demodulator is very complicated, in this letter, we propose a new low-complexity noncoherent iterative space-time demodulator for the USTM constructed from pilot symbolassisted modulation. The proposed demodulator utilizes both hard and soft decisions from the turbo decoder to simplify the computational task as well as produce reliable soft outputs. Several examples demonstrate that this demodulator has both low complexity and good error performance.