Title :
Spectrally efficient differential space-time coding using non-full-diverse constellations
Author :
Taherzadeh, Mahmoud ; Khandani, Amir K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont.
Abstract :
In this paper, a method is proposed to construct spectrally efficient unitary space-time codes for high-rate differential communications over multiple-antenna channels. Unlike most of the known methods which are designed to maximize the diversity product (the minimum determinant distance), our objective is to increase the spectral efficiency. The simulation results indicate that for high spectral efficiency and for more than one receive antenna, the new method significantly outperforms the existing alternatives. In the special case of two transmit antennas, which is the main focus of this paper, the relation between the proposed code and the Alamouti scheme helps us to provide an efficient maximum-likelihood (ML) decoding algorithm. Also, we demonstrate that similar ideas can be applied to designing codes for more than two transmit antennas. As an example, we present a construction for 4-by-4 unitary constellations which has a good performance, compared with the other known codes
Keywords :
antenna arrays; diversity reception; maximum likelihood decoding; receiving antennas; space-time codes; transmitting antennas; wireless channels; 4-by-4 unitary constellations; Alamouti scheme; diversity product; high-rate differential communications; maximum-likelihood decoding algorithm; minimum determinant distance; multiple-antenna channels; nonfull-diverse constellations; receive antenna; spectrally efficient differential space-time coding; spectrally efficient unitary space-time code; transmit antennas; Channel state information; Communications Society; Design methodology; Fading; Maximum likelihood decoding; Mobile communication; Receiving antennas; Transmitting antennas; Vehicles; Wireless communication; Alamouti code; Lie groups; differential space–time (ST) coding; multiple-antenna systems; unitary constellations;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2006.881264