Exact bit error probability of orthogonal space-time block codes with QAM

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications

2008

In this paper, we investigate the effect of imperfect channel estimation on the bit error rate (BER) performance of orthogonal space-time block codes (OSTBCs). The multiple-input multiple-output (MIMO) propagation channel is assumed to be affected by uncorrelated flat Rayleigh block fading. We consider a mismatched maximum-likelihood (ML) receiver, which estimates the channel matrix from known pilot symbols according to a minimum mean-square error (MMSE) criterion, and uses the channel estimate in the symbol-by-symbol detection algorithm as if it were the true channel matrix. For both PAM and QAM constellations and OSTBCs satisfying a proposed criterion, we present simple exact closed-form expressions for the BER of the mismatched receiver and the corresponding BER degradation as compared to a receiver that knows the true channel matrix. For OSTBCs that do not satisfy this criterion, a simple approximation of the BER and the associated BER degradation is derived, assuming PAM and QAM constellations. By means of computer simulations, this approximation is shown to be very accurate.

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Accurate BER Analysis of Orthogonal Space-Time Block Codes with MMSE Channel Estimation

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications

2008

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Exact BER analysis for orthogonal space-time block codes on arbitrary fading channels with imperfect channel estimation

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications

2009

In this contribution, we provide an exact bit error rate (BER) analysis of orthogonal space-time block codes over arbitrarily distributed (possibly correlated) block fading channels with imperfect channel estimation. The transmitted symbols belong to a PAM or QAM signal constellation. With N-t and N-r denoting the number of transmit and receive antennas, respectively, the resulting average BER can easily be written as an expectation over 4N(t)N(r) real-valued random variables, but the computation time needed for its numerical evaluation increases exponentially with N-t and N-r. We provide a methodology that allows an efficient numerical evaluation of the exact BER with a computation time that is essentially independent of NtNr and the signal-to-noise ratio

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Exact BER Analysis for Square Orthogonal Space-Time Block Codes on Arbitrary Fading Channels with Imperfect Channel Estimation

VTC Spring 2009 - IEEE 69th Vehicular Technology Conference

2009