| 摘要 |
<p>A demodulation method for downlink received signal in CDMA, including the following steps: multipath searching the received baseband digital I/Q signal, channel estimating the searched L pieces of effective multipath to obtain the column vector of the channel estimation value (110); the 3 pieces of paths respectively called a strong-path, a week-path, a dummy-path which the weak-path is related to the strong-path are assigned (120), if L is equal to 2 and the Signal-To-Noise ratio is larger than the threshold predetermined; multipath de-scrambling and despreading the paths assigned to obtain a despreading column vector for a target symbol (130); one of the interfering item of the strong-path is replaced by the dispreading result multiplied by a coefficient, so that the despreading result of the strong-path updated is obtained (140); the old despreading result is replaced by the strong-path despreading result updated for maximal ratio combining to obtain demodulated target symbol (150). The present method operates simply and can achieve better performance than Rake receiver, when the number of paths is 2 and the Signal-To-Noise ratio is relatively large, and the interference in cellular presents on main situation.</p> |
