Digital downconverter/despreader for direct sequence spread spectrum CDMA communications system

摘要: A system for digitally downconverting and despreading a multi-channel analog direct sequence spread spectrum signal is provided. The includes free-running, non-steering, clock generator which outputs an A/D sample clock, having rate integral multiple of chip the signal. An converter receives digitized from signal, local pseudo-noise source M pseudo-noises, wherein integer greater that 1 also included. complex downconverter/polyphase filter timing phase control signals, simultaneously filters downconverts to baseband, corrects misalignment between locally generated sequences, corrected baseband