Demodulation and Performance Analysis of Differential Unitary Space-Time Modulation in Time-Varying Rician Channels

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.

[1]  Thomas L. Marzetta,et al.  Unitary space-time modulation for multiple-antenna communications in Rayleigh flat fading , 2000, IEEE Trans. Inf. Theory.

[2]  Dan Raphaeli Correction for "Distribution of Noncentral Indefinite Quadratic Forms in Complex Normal Variables" , 2006, IEEE Trans. Inf. Theory.

[3]  Bertrand M. Hochwald,et al.  Differential unitary space-time modulation , 2000, IEEE Trans. Commun..

[4]  Hamid Jafarkhani,et al.  A differential detection scheme for transmit diversity , 2000, IEEE Journal on Selected Areas in Communications.

[5]  T. Berger,et al.  On the difference of two sums of independent generalized gamma random variables with applications to error performance analysis and outage probability evaluation , 2003, IEEE International Symposium on Information Theory, 2003. Proceedings..

[6]  G. Turin The characteristic function of Hermitian quadratic forms in complex normal variables , 1960 .

[7]  A. Lee Swindlehurst,et al.  Performance of space-time modulation for a generalized time-varying Rician channel model , 2004, IEEE Transactions on Wireless Communications.

[8]  Lutz H.-J. Lampe,et al.  Noncoherent receivers for differential space-time modulation , 2002, IEEE Trans. Commun..

[9]  S. Provost,et al.  The exact distribution of indefinite quadratic forms in noncentral normal vectors , 1996 .

[10]  B. Hughes Further results on differential space-time modulation , 2000, Proceedings of the 2000 IEEE Sensor Array and Multichannel Signal Processing Workshop. SAM 2000 (Cat. No.00EX410).

[11]  A. Lee Swindlehurst,et al.  Effective SNR for space-time modulation over a time-varying Rician channel , 2004, IEEE Transactions on Communications.

[12]  J. Zeidler,et al.  An Explicit and Unified Error Probability Analysis of Two Detection Schemes for Differential Unitary Space-Time Modulation , 2005, Conference Record of the Thirty-Ninth Asilomar Conference onSignals, Systems and Computers, 2005..

[13]  Giorgio Matteo Vitetta,et al.  Further results on differential space-time modulations , 2003, IEEE Trans. Commun..

[14]  Lutz H.-J. Lampe,et al.  Bit-interleaved coded differential space-time modulation , 2002, IEEE Trans. Commun..

[15]  Chintha Tellambura,et al.  Multiple-Symbol Differential Detection for Single-Antenna and Multiple-Antenna Systems over Ricean-fading Channels , 2006, 2006 IEEE International Conference on Communications.