Patent ID: 6148186
Filing Date: 2000-11-14
Classification: H04B

Abstract:
The method of combing a received signal of a diversity type radio device comprising the steps of:generating a phase-detection output at a symbol by phase-detecting each received signal of plural PSK modulation waves received by plural antennas through a delay detection at a symbol of a phase signal forming said each received signal;converting said phase-detection output at said each symbol into a phase difference detection output indicating a phase difference between said symbols;weighting said phase difference wave detection outputs with an amplitude level for combination;wherein said step of converting into said phase difference detection output further comprises the steps of:extracting a phase-detection output from a received signal and latching said phase-detection output at a clock frequency twice a frequency of a symbol clock synchronized with a symbol;shifting said latched phase-detection output with said symbol clock; andgenerating a phase difference detection output by summing said latched phase-detection output and said phase-detection output shifted with said symbol clock.