Moe Z. Win

On the inverse symbol-error probability for diversity reception

This paper addresses the problem of finding the inverse symbol-error probability (SEP) expression for coherent detection of M-ary phase-shift keying with multichannel reception and maximal ratio combining in Rayleigh fading. To this aim, we derive upper and lower bounds on SEP that are simply invertible and uniformly tight for all values of signal-to-noise ratio. This enables us to obtain tight bounds on the inverse SEP and on the symbol-error outage (SEO), i.e., SEP-based outage probability. As an example of application to digital mobile radio, the SEO in a log-normal shadowing environment is analyzed.

Exact symbol error probability for optimum combining in the presence of multiple co-channel interferers and thermal noise

We derive the exact symbol error probability for coherent detection of MPSK signals with optimum combining in the presence of multiple uncorrelated equal power co-channel interferers and thermal noise in a Rayleigh fading environment. The expression is general and valid for arbitrary numbers of receiving antennas or co-channel interferers. The complexity of the analytical model depends on the smaller of the number of antennas and the number of interferers.

Ultrawide bandwidth RAKE reception in the presence of narrowband interference

In this work we derive a closed-form expression for the bit error probability (BEP) of time hopping (TH) ultrawide bandwidth (UWB) systems with RAKE reception in the presence of narrowband interference. We approximate the narrowband interference as a tone interferer and analyze the performance in a realistic scenario where each path is Nakagami-m distributed with arbitrary parameter m for each path. Our approach is based on perturbation theory. Simulation results for narrowband interference such as GSM and Bluetooth are in good agreement with our analytical results based on a tone interferer. It is shown that our analytical results are useful in investigating the coexistence of TH UWB systems with existing wireless systems.

A simple and asymptotically tight upper bound on the symbol error probability of adaptive antennas with optimum combining

We derive a simple closed-form upper bound on the symbol error probability for coherent detection of M-ary PSK using an array of antennas with optimum combining. We assume multiple equal-power cochannel interferers and thermal noise in a Rayleigh fading environment. The new bound applies for an arbitrary number of antenna elements as well as arbitrary number of interferers, and it is proved to be asymptotically tight. Based on the simplicity of the bound, the signal-to-noise ratio penalty due to cochannel interference is evaluated. Comparisons with simulation is also provided, showing that our bound is useful in a large number of practical interesting cases.