Patent ID: 7778148

Claim:
A method for transmitting a spread signal by a transmitting end in a wireless communication system, the method comprising: selecting spreading codes of a spreading factor among spreading codes set having a plurality of spreading factors, according to a length of a cyclic prefix in an orthogonal frequency division multiplexing (OFDM) symbol; spreading a plurality of signals using the spreading codes of the spreading factor; multiplexing the spread plurality of signals into one or more physical hybrid automatic repeat request indicator channel (PHICH) groups; and transmitting the one or more PHICH groups to a receiving end through one or more transmit structures which are configured in the OFDM symbol, wherein the number of PHICH groups when the OFDM symbol has an extended cyclic prefix is determined as multiples of the number of PHICH groups when the OFDM symbol has a normal cyclic prefix.