Patent ID: 7020181
Filing Date: 2006-03-28
Classification: H04B

Abstract:
1. A code division multiple access receiver for demodulating a complex-spread and demodulated received base band signal, the receiver comprising: a spread code-generating section which generates spread codes for each component, a matched filter which performs complex correlation computations of an in-phase component and a quadrature component of a received base band signal and a spread code output from the spread code-generating section and outputs the results of the correlation computations, an electric power-averaging section which performs electric power computations based on the correlation computation results output from the matched filter to determine electric power values, averages the electric power values, and outputs an obtained result of averaging the electric power values as an electric power average result, a correlator section which performs complex correlation computations of the in-phase component and the quadrature component of the received base band signal and the spread code output from the spread code-generating section and outputs the results of the correlation computations for each component, an amplitude-adjusting section which performs electric power computations based on the results of correlation computations output from the correlator section to determine electric power values, averages the electric power values, outputs an average electric power values, and performs bit operation processes for removing invalid bit data on the correlation computation results output from the correlator section based on input amplitude-adjusting signals, and a control section which compares the average electric power values with the electric power average result as the maximum value of a reception level, calculates a ratio of the average electric power values to the electric power average result to measure a reception level of the received base band signal, and outputs amplitude-adjusting signals corresponding to the reception level.