Patent ID: 7978749

Claim:
A multi-channel, direct sequence spread spectrum (DSSS) transmitter configured to efficiently utilize a contiguous region of spectrum having an allocated bandwidth, said transmitter comprising: a multi-channel DSSS modulator configured to generate a plurality of DSSS chip streams; a multi-channel, pulse-shaping filter configured to respectively transform said plurality of DSSS chip streams into a plurality of filtered DSSS chip streams, wherein each of said filtered DSSS chip streams spectrally occupies a minimum-bandwidth channel, an upper rolloff band, and a lower rolloff band; and a frequency multiplexer configured to respectively up-convert and combine said plurality of filtered DSSS chip streams into a multi-channel signal confined within said allocated bandwidth so that: a lower rolloff band for a first one of said minimum-bandwidth channels and an upper rolloff band for a last one of said minimum-bandwidth channels resides inside said allocated bandwidth and outside all of said minimum-bandwidth channels; and all rolloff bands other than said lower rolloff band for said first minimum-bandwidth channel and said upper rolloff band for said last minimum-bandwidth channel predominately reside within adjacent ones of said minimum-bandwidth channels.