ENVELOPE BINARY ORTHOGONAL MODULATION AND DEMODULATION SYSTEM

摘要

PURPOSE: An envelope binary orthogonal modulation and demodulation system is provided to execute envelope binary orthogonal modulation for data so as to transmit the data at a mass data rate and a variable data rate. CONSTITUTION: An envelope binary orthogonal modulator consists of a serial/parallel converter(200), an envelope encoder(210), an orthogonal code generator(220), a plurality of binary orthogonal modulation parts(230,240,250,260), and a parallel combiner(270). The serial/parallel converter(200) converts in-phase or orthogonal phase serial data, separated from a signal splitter, into a data bit(b1), a group of data bits(b0-b2), or many groups of data bits((b0-b2),(b3-b5)(b6-b8)) according to a data rate control signal. The envelope encoder(210) combines many groups of data bits((b0-b2),(b3-b5)(b6-b8)) converted at the serial/parallel converter(200) respectively and generates a plurality of parity bits(r0,r1,r2). The orthogonal code generator(220) generates many groups of orthogonal codes((c0-c3)(c4-c7)(c8-c11)(c12-c15)). The binary orthogonal modulation parts(230,240,250,260) select their respective orthogonal codes among the orthogonal codes((c0-c3)(c4-c7)(c8-c11)(c12-c15)) according to many groups of data bits((b0-b2),(b3-b5)(b6-b8)) and the parity bits(r0,r1,r2) and adjust the codes. The parallel combiner(270) sums up the orthogonal codes, outputted from the binary orthogonal modulation parts(230,240,250,260), in parallel and generates envelope binary orthogonal modulation data.