Patent ID: 6985544
Filing Date: 2006-01-10
Classification: H04B

Abstract:
1. A diversity receiver comprising: a plurality of antennas for diversity receiving wireless signals subjected to direct spread modulation; an antenna switch for selecting any one of said plurality of antennas and conducting connection switching thereof; a demodulator for demodulating the wireless signals received via the antenna connected by said antenna switch and obtaining a spread spectrum signal; correlation value detection means for finding a correlation value of said spread spectrum signal and a spread code for demodulation; a mean value computation unit for finding a mean SNR (Signal to Noise Ratio) of the received signal by converting a maximum correlation value which is output by said correlation value detection means to a value per 1 frame; storage means for storing said mean SNR; an estimation unit for linear/evaluation of the SNR of the received signal based on a time series data of the mean SNR stored in said storage means; and a level comparator for comparing the SNR of the received signal that was predicted by said estimation unit with a threshold value and outputting a control signal for conducing antenna switching to said antenna switch.