A METHOD OF AND APPARATUS FOR PROCESSING VARIABLE RATE DATA FOR TRANSMISSION IN A FIXED RATE TRANSMISSION MEDIUM

摘要

An apparatus for processing a frame of data for transmission comprises: a demodulator flag generator (2) for appending a flag indicative of a forthcoming frame of data using a supplemental channel; a CRC generator (4) for generating and appending to said frame of data a check bit sequence generated in accordance with said frame of data and a predetermined CRC format; a tail bit generator (6) for appending a 8 bit tail of predetermined value to said frame; an encoder (8) for encoding said frame in accordance with a predetermined encoder format; and an interleaver (10) for reordering encoded symbols. The apparatus is suitable for transmitting high speed digital data in a spread spectrum communications system. There is described a method for processing the data for transmission in a 1.2288 Mcps band and in a 3.6268 Mcps band. In addition, there is described a method for transmitting forward link and reverse link data of both rate set 1 digital data and rate set 2 digital data. Rate set 1 digital data comprises variable rate data at rates defined as MUX Option 1 in the IS-95 standard. Rate set 2 digital data comprises variable rate data at rates defined as MUX Option 2 in the appendix to the IS-95 standard. There are also described methods of transmitting the data for applications using packet switched technology and circuit switched technology.