Digital spread-spectrum multipath-diversity receiver for indoor communications

The design and performance measurements of a digital direct-sequence spread-spectrum (DS-SS) receiver for a wireless indoor communication system are provided. The system operates at a chip rate of 16.368×10⁶ chips/s with a processing gain of 30 dB. A RAKE-structure is used to resolve the time diversity due to multipath propagation. The received signal is despread in eight arms at the baseband using a digital time-integrating correlator. All algorithms for synchronization and data demodulation are implemented as software modules on a general-purpose digital signal processor (DSP). The authors give a derivation of these digital algorithms, a description of the hardware implementation, and results of the first measurements