Minimizing power consumption in direct sequence spread spectrumcorrelators by resampling IF samples-Part II: implementation issues

摘要

Most modern digital receivers sample the received RF signal at annintermediate frequency, then downconvert to the baseband in the digitalndomain. Instead of correlating at the sampling frequency, the receivednSignal is downsampled to two samples per chip using an all-unitynresampling filter presented in Part I of this paper. Four differentnresampling parallel correlator architectures are presented and comparednin terms of power and area using analytical techniques as well asnsimulation data obtained from actual circuit layouts. The resamplingnprocess reduces the power consumption of the correlators by almost thenresampling ratio, which is twice the chip frequency divided by thensampling frequency. Additional reduction of over a factor of two isnpossible using the architectures presented in this paper