CONSTANT AMPLITUDE BINARY ORTHOGONAL MODULATOR/DEMODULATOR - THE MODULATOR PERFORMS A CONSTANT AMPLITUDE BINARY ORTHOGONAL MODULATION PROCESS FOR DATA TO BE TRANSMITTED AND THE DEMODULATOR CORRECTLY DEMODULATES THE MODULATED DATA BY USING PARITY BITS

摘要

PURPOSE: A constant amplitude binary orthogonal modulator/demodulator is provided to reduce the power consumption of a communication system by performing a constant amplitude binary orthogonal modulation process for transmission data. CONSTITUTION: A serial/parallel converter(200) is used for converting serial data to a data bit, a group of data bits, and a plurality of groups of data bits according to a data rate control signal. A constant amplitude encoder(210) is used for generating parity bits of each group by combining the plural groups of data bits. An orthogonal code generator(220) is used for generating different groups of orthogonal codes. A plurality of binary orthogonal modulators(230,240,250,260) are used for selecting one orthogonal code from each group and performing a binary orthogonal modulation process. A parallel adder(270) is used for adding output signals of the plural binary orthogonal modulators in parallel.