Patent ID: 6128333
Filing Date: 2000-10-03
Classification: H01Q,H04B

Abstract:
A spread spectrum radio transmission digital mobile communication device having RAKE receiving functions and provided with inverse diffusion means for taking correlation of received signals and diffusion signals to perform inverse diffusion and synthesizing means for synthesizing paths by giving a delay time corresponding to each of said paths to an inversely diffused signal, comprising:a plurality of variable gain amplifying means for adjusting amplification factor of signals received at each of a plurality of receiving branches at different spatial positions;adding means for adding signals outputted from each of said variable gain amplifying means and for supplying said signals to said inverse diffusion means;gain control means for controlling amplification factor of said plurality of variable gain amplifying means to decrease influence of delay wave having delay time smaller than chip time width of diffusion signal in the signals supplied to said inverse diffusion means; anderror rate detecting means for detecting error rate of output of said synthesizing means and said gain control means controls amplification factor of said variable gain amplifying means to decrease said error rate;whereby path separation being performed on the signals inversely diffused by said inverse diffusion means, and said synthesizing means synthesizing paths by giving a delay time corresponding to paths to each of the signals processed by said path separation.