Title :
Differential space-frequency trellis codes
Author :
Hong, Zhihong ; Thibault, Louis ; Zhang, Liang
Author_Institution :
Commun. Res. Centre, Ottawa, Ont.
Abstract :
A new differential space-frequency trellis coding (DSFTC) scheme is proposed for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The transmitter differentially encodes the message drawn from a set of unitary matrices following a trellis encoding rule. At the receiver, where no channel state information (CSI) is available, differential decoding and soft-input Viterbi algorithms are employed in the decoding process. The proposed codes can achieve full rate, 1 symbol/subcarrier, and full spatial diversity. Simulation results show that the proposed codes provide significant improvements over differential space-frequency block codes (DSFBC) due to increased coding gains
Keywords :
MIMO systems; OFDM modulation; Viterbi decoding; diversity reception; radiocommunication; trellis codes; DSFTC; MIMO OFDM systems; coding gains; differential decoding; differential space-frequency block codes; differential space-frequency trellis codes; multiple-input multiple-output orthogonal frequency division multiplexing systems; soft-input Viterbi algorithms; spatial diversity; trellis encoding; unitary matrices; Block codes; Channel state information; Convolutional codes; Decoding; Fading; MIMO; Modulation coding; OFDM; Viterbi algorithm; Wireless communication;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2006.04633
