Title :
New full-diversity high-rate space-time block codes based on selective power scaling
Author :
Das, Sushanta ; Al-Dhahir, Naofal ; Calderbank, Robert ; Chui, Jimmy
Author_Institution :
Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
We design a new rate-5/4 full-diversity orthogonal STBC for QPSK and 2 transmit antennas by enlarging the signalling set from the set of quaternions used in the Alamouti [1] code. Selective power scaling of information symbols is used to guarantee full-diversity while maximizing the coding gain and minimizing the transmitted signal peak-to-minimum power ratio. The optimum power scaling factor is derived using two equivalent criteria and shown to outperform schemes based on only constellation rotation while still enjoying a low-complexity ML decoding algorithm. Extensions to the case of 4 transmit antennas are reported in [4].
Keywords :
block codes; maximum likelihood decoding; quadrature phase shift keying; transmitting antennas; Alamouti code; QPSK; coding gain; constellation rotation; full-diversity high-rate space-time block code; information symbol; low-complexity ML decoding algorithm; maximum likelihood decoding algorithm; optimum power scaling factor; orthogonal STBC; peak-to-minimum power ratio; quadrature phase shift keying; quaternion set; selective power scaling; transmit antenna; Abstracts; Matched filters;
Conference_Titel :
Signal Processing Conference, 2006 14th European
Conference_Location :
Florence
