CDMA equalizer quantization

Abstract

Our topic is channel equalizer quantization for a cellular handset. We answer questions regarding quantization of variables internal to the equalizer using some estimated bounds and simulation. This includes the catastrophic event of breakdown due to a roundoff-induced singularity in Cholesky factorization. Realistic modeling of the received waveform and channel estimation includes quantization effects, as well as quantization of the taps used in the operation of the equalizer. Modem results are given in terms of frame error rate and throughput for various quantization scenarios.