Patent ID: 7746940

Claim:
A method for transmitting a signal in a communication system including a symbol buffer and a windowing processor, comprising the steps of: storing, by the symbol buffer, a signal of a first interval included in a previous symbol prior to a current symbol as a signal of a previous symbol interval, the current symbol including a guard interval and an effective symbol interval subsequent the guard interval; and windowing, by the windowing processor, the current symbol based on a window size by overlapping the stored signal of the first interval with a signal of a second interval included in the current symbol subsequent to the previous symbol and transmitting a windowed signal, wherein the first interval is an interval corresponding to the window size from a start point of the effective symbol interval included in the previous symbol, wherein the second interval is an interval corresponding to the window size from a start point of the guard interval included in the current symbol, wherein the windowing step comprises: multiplying the signal of the second interval by a preset first windowing coefficient and multiplying the signal of the first interval by a preset second windowing coefficient; and adding and overlapping the signal of the second interval multiplied by the first windowing coefficient and the signal of the first interval multiplied by the second windowing coefficient, and wherein the first and second windowing coefficient are computed by: W 1 ⁡ ( n ) = ⁢ 0.5 × ⁢ ( 1 + cos ⁡ ( π × ( 1 + n win_size ) ) ) , for ⁢ ⁢ n = 0 , … ⁢ , win_size - 1 W 2 ⁡ ( n ) = 1 - W 1 ⁡ ( n ) , for ⁢ ⁢ n = 0 , … ⁢ , win_size - 1 where W 1 (n) denotes the first windowing coefficient, W 2 (n) denotes the second windowing coefficient, and win size denotes sizes of the first and second intervals.