Patent ID: 6222819
Filing Date: 2001-04-24
Classification: H04J

Abstract:
A transmission controller for processing data items to be transmitted over a wireless link connecting a central terminal and a subscriber terminal of a wireless telecommunications system, a single frequency channel being employed for transmitting data items pertaining to a plurality of wireless links, the transmission controller comprising:an orthogonal code generator for providing an orthogonal code from a set of `m` orthogonal codes used to create `m` orthogonal channels within the single frequency channel, wherein `m` is a positive integer;a first encoder for combining a data item to be transmitted on the single frequency channel with said orthogonal code from the orthogonal code generator, the orthogonal code determining the orthogonal channel over which the data item is transmitted, whereby data items pertaining to different wireless links may be transmitted simultaneously within different orthogonal channels of said single frequency channel;an overlay code generator for providing an overlay code from a first set of `n` overlay codes which are orthogonal to each other, wherein `n` is a positive integer; anda second encoder arranged to apply the overlay code from the overlay code generator to said data item, whereby `n` data items pertaining to different wireless links may be transmitted simultaneously within the same orthogonal channel.