| 摘要 |
A method for transmitting data including an impulse symbol with the optimum size and a method for estimating a channel by the impulse symbol in an orthogonal frequency division multiplexing system are provided to improve a bit error rate while satisfying a proper PARP(Peak to Average Power Ratio). In an OFDM(Orthogonal Frequency Division Multiplexing) system, an impulse symbol with the optimum size for estimating a channel is inserted into the rear of the data symbol and the data is transmitted. A complex random variable obtained by modulating an OFDM data bit stream is converted into a signal in a time domain by the IDFT(Inverse Discrete Fourier Transform)(312). The specific number of null symbols and the impulse symbol for estimating the channel are inserted into a guard interval of the rear of the data symbol in the converted signal(313). The OFDM data symbols into which the impulse symbol is inserted are transmitted. The size of the impulse symbol is determined by a power boosting factor that is the numerical value for showing the multiple of the average power of the OFDM data symbol. |
