Spreading Codes for Wireless Spread Spectrum Communications

Spread spectrum techniques are often utilized when designing wireless communication systems. The success of a spread spectrum system depends greatly upon the spreading codes employed by the transmitters. In this paper, a novel approach to the generation of spreading codes is examined. In particular, spreading codes are generated as the impulse responses of a multirate subband lter bank. A methodology is presented for designing the lter banks such that the resulting spreading codes have properties which are desirable in a multiuser wireless communications environment. Several examples are given for diierent types of commonly encountered interference sources. Results are then generated which compare the newly developed spreading codes to more traditional spreading techniques.