Title :
WLC16-5: BER Analysis of STBC with Packet Combining in MIMO Rayleigh Fading Channels: LLR-Based Approach
Author :
Aissa, Sonia ; Aniba, Ghassane
Author_Institution :
INRS-EMT, Univ. of Quebec, Montreal, QC
fDate :
Nov. 27 2006-Dec. 1 2006
Abstract :
Adopting a log-likelihood ratio (LLR) based approach, we analyze the bit error rate (BER) performance of orthogonal space-time block coding (STBC) using M-ary quadrature amplitude modulation (M-QAM) along with packet combining triggered by automatic repeat request (ARQ) retransmission over multiple-input multiple-output (MIMO) Rayleigh fading channels. Specifically, considering the 16-QAM case of study, we provide an exact formula for the aggregate LLR distribution in the case the STBC codeword can be transmitted twice, and derive an exact expression for the BER. For higher number of retransmissions, an approximation of the error function, erf(.), is used to derive the LLR distributions and the system´s ensuing BER. The proposed BER analytical model is validated through simulations considering transmission over additive white Gaussian noise (AWGN) and MIMO Rayleigh fading channels, for different STBC mappings, different values of combined transmissions, and possible constellation rearrangement (CoRe).
Keywords :
AWGN channels; MIMO communication; Rayleigh channels; automatic repeat request; block codes; error statistics; orthogonal codes; quadrature amplitude modulation; space-time codes; AWGN; BER analytical model; LLR-Based Approach; M-ary quadrature amplitude modulation; MIMO Rayleigh fading channels; STBC; additive white Gaussian noise; automatic repeat request retransmission; bit error rate performance; constellation rearrangement; error function; log-likelihood ratio based approach; multiple-input multiple-output channels; orthogonal space-time block coding; packet combining; AWGN; Analytical models; Automatic repeat request; Bit error rate; Block codes; Error analysis; Fading; MIMO; Performance analysis; Quadrature amplitude modulation;
Conference_Titel :
Global Telecommunications Conference, 2006. GLOBECOM '06. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0356-1
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2006.708