| 摘要 |
PURPOSE:To improve frequency using efficiency by using a spread system whose mutual correlation is small, and assigning one spread system to plural users. CONSTITUTION:At a transmission side 11, the spread system having a large self-correlation value in a certain time shift, and the small self-correlation value in more then one other time shifts, and more than one spread systems time- shifted by the time shift in which the small self-correlation value is obtained are generated by a spread system generator 12 and a delay circuit 13. Then, the respective spread systems are individually spectrum-spread by spreaders 15 and 17 as respective separated informtion systems, added by an adder 18, modulated by a modulator 19, and transmitted. At a reception side 21, a received signal is spectrum inverse spread processed by a matching filter 22, outputted to a sampler 23, and outputted hrough a delay circuit 24 to a sampler 25. The outputs are outputted to weighting circuits 26 and 27 and an adder 28, so that the signal of a system corresponding to the plural spread systems can be separated into more than one, and one of the respective separated information systems can be obtained. |
