Title :
Demodulation and Performance Analysis of Differential Unitary Space-Time Modulation in Time-Varying Rician Channels
Author :
Sui, Haichang ; Zeidler, James R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, San Diego, La Jolla, CA
Abstract :
Studies on differential unitary space-time modulation are mostly focused on Rayleigh fading channels. In this paper we present new analytic results for the maximum-likelihood demodulator (MLD) and the standard differential demodulator (SDD). The resulting expressions and bounds on the pairwise error probability shed light on the impact of various system parameters and are helpful towards a deeper understanding of the DUSTM in Rician channels. Additional analytic results are also derived for the constellation in the work of Tarokh and Jafarkhani (2000). Unlike in Rayleigh fading, the exact MLD can only be implemented approximately (Cui and Tellambura, 2006). The performance loss of practical demodulator such as the SDD and a prediction-based demodulator relative to the MLD are studied under different Rician fading environments.
Keywords :
Rician channels; demodulators; error statistics; maximum likelihood estimation; space-time codes; Rician channel; differential unitary space-time modulation; error probability; maximum-likelihood demodulator; standard differential demodulator; Computer vision; Covariance matrix; Demodulation; Fading; Integral equations; Pairwise error probability; Performance analysis; Performance loss; Rayleigh channels; Rician channels;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.413
