Patent ID: 8345735

Claim:
A frequency selective spreader having an improved transmission data rate, comprising: an N-bit counter outputting n number of data input bits (where n is a positive integer); a subtracter receiving M number of data input bits (where M is a positive integer, and M<N is satisfied), N−M number of frequency selection control bits, and an offset input bit to select a desired frequency band; N−1 number of first XOR operation units performing gray indexing of the N−M number of frequency selection control bits and the M number of data input bits; N number of AND operation units respectively performing AND operations of an output of the N-bit counter, the N−M number of frequency selection control bits, and bits output from the N−1 number of first XOR operators; a second XOR operator performing an XOR operation of outputs of the N number of AND operation units; a bit circular delay unit performing a bit circular shift on an output of the second XOR operation unit; and a multiplexer selecting one between the output of the second XOR operation unit and an output obtained by performing the bit circular shift on the output of the second XOR operation unit, and outputting the selected output.