Adaptive equalization for a multipath fading environment with interference and noise

Abstract

Investigates the average bit error rate (EER) and outage performance of a TDMA indoor wireless cellular system employing an adaptive fractionally spaced decision feedback equalizer (DFE) in the presence of adjacent and co-channel interference (ACI and CCI) and additive Gaussian noise. There exist performance gains in the presence of strong interference and negligible ambient noise relative to the equivalent stationary noise case. Moreover, a directly adapted RLS DFE performs better than a computed MMSE DFE which employs estimates of the channel impulse response (CIR) and interference plus noise autocorrelation. However, these comparative performance gains are compromised by the presence of appreciable noise power and/or more interferers than the receiver can process effectively, The use of a wide receiver bandwidth yields a performance improvement for channel spacings which allow for sufficient spectral overlap of the ACI with the desired signal bandwidth. Thus, a reduction in channel spacing increases the radio capacity while maintaining a desired average EER or outage performance. >