Transceiver providing selectable frequencies and spreading sequences

DETAILED DESCRIPTION A transceiver for transmitting and receiving digital data in a network environment is described.
The transceiver includes both transmitter and receiver sections.
The transmitter section is used for encoding a digital bit stream to a direct sequence spread spectrum signal.
The direct sequence spread spectrum signal is then transmitted to another transceiver within the network.
Specifically, the transmitter of the present invention locks the digital bit stream, a predetermined spread spectrum chip sequence and a carrier signal using binary phase shift keying modulation techniques.
The frequency of the carrier signal, chip sequence and the bit stream are all derived from, and integrally related to, an accurate reference frequency.
The reference frequency is produced by a crystal oscillator circuit.
By deriving and relating the encoding signals in this manner, the receiver section of the transceiver can rapidly acquire and decode the transmitted signal.
The transceiver also includes circuit means for modifying the pseudonoise chip sequence to provide selectable spreading sequences for multiple communications channels on a single transmission medium.
Additional means for providing selectable carrier frequencies may also be incorporated into the transceiver in an alternative embodiment.
The receiver portion of the transceiver includes an integrate and dump filter having in-phase and quadrature phase detector circuits.
The outputs of each of these phase detector circuits are coupled to a linear correlator for despreading of the chip sequence and recovery of the digital data stream.