Low-complexity diversity combining algorithms and circuit architectures for co-channel interference cancellation and frequency-selective fading mitigation

Low-complexity diversity combining algorithms and circuit architectures for co-channel interference cancellation and frequency-selective fading mitigation, which do not require training sequences, are introduced in this paper. Results obtained from computer simulation of hardware show that two-antenna diversity combining gives wireless communication systems a signal to interference ratio improvement of at least 3 dB over conventional two-antenna selection diversity. The technique is also effective in mitigating frequency selective fading without using conventional equalization-an average irreducible word error rate (WER) of 2.4% is obtained in computer simulation of hardware for radio channels with normalized delay spread of 0.3. In contrast, for the same WER, selection diversity and single antenna without diversity can sustain normalized delay spread up to about 0.16 and 0.06 respectively.