Combining Compressed Transformed Data in a Modem

摘要

In a cellular radio modems (120, fig. 1) baseband processor (222), a data compression function (306) compresses data which has been transformed from time domain to frequency domain (300) or vice versa (302), and then a data combination function (304) combines this data with other data in the compressed domain, eg. channel estimate data. The transforms may be Discrete Fourier, Discrete Cosine or Walsh Hadamard and the compression may be lossy quantization.