Abstract: A digital voice-data communication system having a base network control unit coupled to a plurality of fixed transceivers for providing communications to a plurality of portable sets. The base network control unit includes control means for permitting communication between the portable sets within the system, or between the portable sets and a larger external telecommunications network. The system employs frequency hopping, time division multiplexing and demand assigned multiple accessing to permit economy of fixed resources via multiple voice channels for each fixed station transceiver and relatively simple portable sets which may be hand held.

Abstract: The spread spectrum digital communication system includes data input devices for generating digital information signals to be transmitted using radio signals. A chip stream generator converts the data bits into chip streams that are either complemented or not complemented via an exclusive-OR gate, depending on the data bits. A scrambler further randomizes the chip stream for transmission. The receiver includes a descrambler and a correlator or digital matched filter for detecting the data signal. A modified receiver includes a sampler for sampling the scrambled signal at a rate which is the multiple of the chip rate thereby eliminating any need for recovering the chip clock. Another modified version includes a receiver having means for generating multi-level signals indicating the quality of the probable detection.