VLSI implementation of soft output Viterbi equalizers for mobileradio applications

摘要

Advantageous optimum and suboptimum receiver structures operatingnin the IF domain, therefore enabling real signal processing and reducingnhardware expense, are presented. Petri net representations of the softnoutput Viterbi equalizer (SOVE) and the transition metric calculationncombined with so-called add-soft-output-select recursion are given.nHence, an efficient design flow and an easy-to-accomplish validation ofnthe functionality of the design is achieved. Further, the impact of thenquantization and the duration of the channel impulse response on bothnthe performance and the complexity of SOVE VLSIs are considered