| 摘要 |
PURPOSE: A resource allocation method for an orthogonal frequency division multiplexing wireless communication system and transmission signal generating method and apparatus using the same are provided to reduce adjacent cell interferences in one channel. CONSTITUTION: A transmitter for an OFDM-FDMA(Orthogonal Frequency Division Multiplexing-Frequency Division Multiple Access) wireless communication system includes a user message symbol generator(502), a first zero value setter(514), an IDFT(Inverse Discrete Fourier Transformation) portion(510), a second zero value setter(514), a P/S(Parallel/Series) converter(512), and a sequential expander. The user message symbol generator generates user message symbols of k users. The first zero value setter generates zero values to be set for all of the N-M-K non-used sub-carriers. The IDFT portion performs an inverse fourier transform on a first signal made by combining the user message symbol and the N-M-K non-used sub-carriers to generate IDFT outputs. The second zero value setter generates M zero values. The P/S converter combines OFDM symbols in a time domain and converts the combined parallel signal to a serial signal. The sequential expander copies a last portion of the OFDM symbols in the time domain by a sequential expansion and generates an OFDM transmission signal. |
