| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an MC-CDMA code diversity communication system for wireless LAN/OFDM, which can improve an interference suppression effect by applying code diversity on a frequency axis to an OFDM/CDMA (MC-CDMA) system. <P>SOLUTION: In a transmitter 10, a spreading system created by the sum of a plurality of code systems is multiplied by digitally modulated data, signals are rearranged on the frequency axis by a serial-parallel converter 14, and the signals are rearranged on a time axis by an inverse Fast Fourier transform circuit 15. In a receiver 20, the signals are rearranged on the time axis by a serial-parallel converter 21, the signals are rearranged on the frequency axis by a Fast Fourier transform circuit 22, the data is branched to each branch by performing parallel-serial conversion, multiplied by the plurality of code systems to acquire each correlation, each branch is multiplied by a weighting factor by a multiplier 25, the data is synthesized by a synthesizer 26, the summation of each branch is calculated to determine the data. <P>COPYRIGHT: (C)2009,JPO&INPIT |
