Transmitter receiver for mobile communication system

Claim 1

A transmitter receiver for a CDMA (Code Division Multiple Access) mobile communication system including a transmitter and a receiver, said transmitter comprising: an interleaver for interleaving each frame of transmitted data; an interleave memory provided in said interleaver, said interleave memory being capable of writing and reading row by row and column by column, respectively; modulation means for data modulating the interleaved transmitted data into a narrowband modulated signal; and spread modulation means for spread modulating said narrowband modulated signal into a wideband modulated signal using a spreading sequence, wherein said interleaver writes said transmitted data into said interleave memory row by row, and reads said transmitted data from said interleave memory column by column, thereby carrying out the interleave, said receiver comprising: despreading means for converting said wideband modulated signal into said narrowband modulated signal; demodulation means for demodulating said narrowband signal into demodulated data; a deinterleaver for deinterleaving said demodulated data frame by frame to recover said transmitted data; and a deinterleave memory provided in said deinterleaver, said deinterleave memory being capable of writing and reading column by column and row by row respectively, wherein said interleaver writes said demodulated data into said deinterleave memory column by column, and reads said demodulated data from said deinterleave memory row by row, thereby carrying out the deinterleave, and said transmitter receiver comprising: control means for controlling a transfer rate from column to column (columns/sec) at a predetermined fixed rate V T in reading data from said interleave memory and writing data into said deinterleave memory, and for variably controlling a read rate V R and a write rate V W (bits/sec) of data in each said column.