CHIP-SYNCHRONOUS CDMA MULTIPLEXER AND METHOD RESULTING IN CONSTANT ENVELOPE SIGNALS

摘要

In a spread spectrum, chip-synchronous code-division multiple access (CDMA) communication system, a multiplexer and method for chip-synchronous CDMA signals that produces a constant envelope signal rather than the fluctuating amplitude signal that results from linear superposition of individual CDMA waveforms. The chip-synchronous CDMA communication system includes a multiplicity of user channels (10-1 to 10-N), each user channel including digital quadrature (I, Q) channels (14 and 15), a common multiplexer (25) for multiplexing all the I channels and the Q channels into two separate constant-envelope baseband signals, baseband filters (26 and 27) for filtering the constant-envelope baseband signals to produce baseband filtered signals, and an upconverter (28) for upconverting the baseband filtered signals to radio frequency.