[Show abstract][Hide abstract] ABSTRACT: We evaluate truncated union bounds on the frame-error rate (FER) performance of space-time (ST) codes operating over the quasi-static fading channel and compare them with computer simulation results. We consider both ST trellis and block codes. We make the following contributions. For the case of ST trellis codes, we develop a general method, which we denote as measure spectrum analysis, that characterizes ST codeword differences and accommodates the combined influences of the ST code and channel scenario. We propose a numerical bounding method that converges in the measure spectrum to within a very small fraction of a decibel to the simulated FER over the full range of signal-to-noise ratio. In addition, we demonstrate the existence of dominant quasi-static fading error events and detail a method for predicting them. Using only this set of dominant measure spectrum elements, very rapid and tight numerical estimation of FER performance is attained.
IEEE Transactions on Communications 11/2004; · 1.75 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We evaluate truncated union bounds on the frame error rate performance of space-time (ST) codes operating over the quasistatic fading channel and compare them to the results from computer simulation. Both ST trellis and block codes are considered. We calculate these bounds by characterizing the set of codeword differences from a general expression for the exact pairwise error probability (PEP). We discussed in detail the significantly tighter numerical bound for quasistatic fading and demonstrate the code properties that account for this tightness. Using this improved bound we show empirical evidence that for some codes a set of dominant error events characterize the FER performance. We also compare these performance results to outage capacity.
Communications, 2003. ICC '03. IEEE International Conference on; 06/2003
[Show abstract][Hide abstract] ABSTRACT: In this paper, we e v aluate truncated union bounds on the frame error rate FER performance of selected space-time codes for three diierent channel scenarios and compare them to results of computer simulation. Channels with AWGN, uncorrelated Rayleigh fading, and block R a yleigh fading are considered. To calculate the bounds, we use a superstate trellis approach t o c haracterize codeword diierences accord-ing to performance measures derived from a general ex-pression for the exact pairwise error probability PEP 11. We observe that the computed bounds are very accurate for AWGN and uncorrelated fading, but quite loose for block fading. We then generalize the results of 22 to obtain a signiicantly tighter bound for the block fading case.
[Show abstract][Hide abstract] ABSTRACT: An iterative receiver is proposed for a wireless communication system employing multiple transmit and receive antennas. The transmitted symbol sequences are space-time encoded. By exploiting the inherent structure in the space-time encoded data sequence, the receiver is able to significantly improve the initial estimate of the unknown channel leading to significant performance gains in terms of the bit-error-rate (BER) as a function of the signal-to-noise ratio (SNR). Computer simulations demonstrate the efficacy of the scheme in single-user and multi-user environments.
Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on; 02/2000