Patent ID: 6735185
Filing Date: 2004-05-11
Classification: H04B,H04J,H04L

Abstract:
A reverse channel structure for providing high speed data transmission within a CDMA communications network, wherein the reverse channel structure has at least one front end sequence including a repeater and an interleaver, the interleaver outputting a data stream, the reverse channel structure comprising:a plurality of modulator/spreading pathways for receiving the data streams in parallel, each modulator/spreading pathway comprising a Walsh modulator and a modulo-2 adder, each modulo-2 adder receiving a spreading code signal for generating a direct-sequence spread signal; a long code generator for generating a plurality of shifted long code phases using a plurality of long code masks, one shifted long code phase corresponding to each long code mask, each long code mask comprising a string of bits, a first portion of the string of bits being fixed and a second portion of the string of bits being variable for selecting one of a plurality of parallel code channels, wherein the string of bits in each long code mask comprises forty-two bits, the first portion of the string of bits comprises a permuted electronic serial number comprising thirty-two least significant bits of the forty-two bits plus (10 minus b) of ten most significant bits of the forty-two bits, and the second portion comprises b bits, wherein one of the plurality of shifted long code phases provides the spreading signal for each modulator/spreading pathway so that the direct-sequence spread signal generated by each modulator/spreading pathway is spread on a different code channel; and means for combining a plurality of direct-sequence spread signals generated by the plurality of modulator/spreading pathways and generating a single multi-channel signal therefrom for quadrature spreading and transmission.