Uniden Corporation

Muneki Ito

Shigeo Sato

Akio Horibe

Masaki Matsui

Toshiaki Fujikura

It is an object of the present invention to improve the diversity gain by conducting linear prediction of fading fluctuations and switching antennas. In order to attain this object, the diversity receiver in accordance with the present invention comprises a plurality of antennas for receiving wireless signals subjected to direct spread modulation, an antenna switch for conducting antenna connection switching thereof, a primary demodulator for demodulating the wireless signals and obtaining a spread spectrum signal, a matched filter for finding a correlation value of the spread spectrum signal and a spread code for demodulation, a mean value computation unit for finding a mean SNR of the received signal by converting the maximum correlation value to a value per 1 frame, an estimation unit for linear prediction of the SNR of the received signal based on the time series data of the mean SNR, and a level comparator for comparing the SNR of the received signal that was predicted by the estimation unit with a threshold value and outputting a control signal for conducting antenna switching to the antenna switch.

Diversity receiver

The present invention provides a diversity receiving device with superior interference resistance in a simple construction, comprising a plurality of antennas (); an antenna switching device () that selects any one of a plurality of antennas () and carries out connection switching thereof; a demodulator () that demodulates a wireless signal and obtains a baseband spread spectrum signal; an A/D converter () that A/D converts the baseband spread spectrum signal and generates chip data; a digital matched filter () that finds the correlation value of the chip data and the spreading code; a maximum correlation value detection portion () that detects the maximum correlation value; an average value calculation portion () that finds the average value per frame of the maximum correlation value; and a level comparison device () that compares the above-mentioned average value and a predetermined threshold value, and outputs a control signal to the antenna switching device () to control antenna switching in the antenna switching device ().

Growing community of inventors

Tokyo, Japan

Muneki Ito