Subscriber unit for wireless communication with a master station in wireless digital subscriber system

A are used to carry and wireless communication the user wireless communication system neutral base station and user device, which comprises a FIR chip, DIF (digital intermediate-frequency) chip, the chip and a radiocommunication apparatus. Processor chip facing digital speech input signal decoding, to provide digital input; symbolsTo output signal demodulation is received from the base, to provide digital output; symbolsAnd synthesis of the voice signal output from the digital output symbols. The FIR chip a filter FIR to the digital input symbol, and generating timing signal; the decoding and synthetic service for processor chip time delay. The DIF chip synthesis (DDS) method to the digital is integrated with the digital intermediate frequency signal for direct digital.