1. A method for generating pseudo random sequence in a wireless communication system, comprising: generating a first output sequence by inputting a fixed initial value to a first linear feedback shift register (LFSR) having m blocks; generating a second output sequence by inputting one of m-bit initial values different from the fixed initial value to a second LFSR having m blocks; after inputting a predetermined initial value to a third LFSR having m blocks, generating a third output sequence by delaying a sequence output from the third LFSR by a non-zero delay value N; and generating the pseudo random sequence by summing the first output sequence, the second output sequence, and the third output sequence bit by bit through a modulo 2 operation.