[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: 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
[show abstract][hide abstract] ABSTRACT: This paper presents a theoretical analysis of the effect of
constellation shaping in the transmitter on multimodulus (MMA) blind
equalization in the receiver. Constellation shaping reduces average
signal energy by a non-uniform distribution of constellation point
utilization. Optimal transmit efficiency is achieved by a Gaussian
distribution but many blind equalization algorithms require a
non-Gaussian source. We demonstrate, using complex constellations, MMA
convergence failure as a Gaussian source kurtosis is approached. Our
generalized cost function analysis of the related constant modulus
algorithm (CMA) for complex constellations identifies the mechanism of
the MMA convergence failure. We introduce a new design procedure for
determining the kurtosis-specific MMA moduli and present simulation
results that illustrate MMA convergence properties for varying source
Communications, 1999. ICC '99. 1999 IEEE International Conference on; 02/1999