Patent ID: 7190683
Filing Date: 2007-03-13
Classification: H04B

Abstract:
1. A method for operating a communication system, comprising steps of: defining the system as a combined Code Division Multiple Access CDMA and Frequency Division Multiple Access FDMA system, wherein CDMA is used within each FDMA sub-channel, and a plurality of PN code channels are available in each of the FDMA sub-channels; using at least one base station and a plurality of subscriber stations, where the at least one base station and each of the plurality of subscriber stations have a plurality of frequency agile and PN code agile data modulators and demodulators, and wherein each of the frequency agile and PN code agile data modulators and demodulators can be selectively tuned to separate PN code channels operating within the FDMA sub-channels; determining current transmission requirements based, at least in part, on operating conditions; and selecting a number of FDMA sub-channels sufficient to meet current transmission requirements, wherein the system operates as a variable bandwidth system as the number of FDMA sub-channels varies due to transmission requirements.