| 摘要 |
PURPOSE:To improve the degree of multiplex while ensuring the transmission quality by applying multiplexing while the correlation of two multiplex signals is kept 0. CONSTITUTION:Signal series S11-SM1, SIQ-SMQ are inputted to input terminals 41-4M, 51-5M. One of the signal series S11-SM1 is multiplexed with each modified M series outputted from each tap of a shift register 62 by multipliers 101-10M, added by an adder 110 to be an in-phase channel multiplex signal 11. On the other hand, the other signal series SIQ-SMQ is multiplied with each modified M series outputted from each tap of the shift register 62 by multipliers 201-20M, added by an adder 210 to be an orthogonal channel multiplex signal Q1. The modified M series is a series adding a DC component to the M series so that the correlation is zero when the series is shifted by one bit or over. Thus, the modified M series subject to bit shift is used to apply spread spectrum processing in the same timing, then the mutual correlation of each signal series subject to spread spectrum is made zero. |
