Diversity receiver

DETAILED DESCRIPTION It is an object of the present invention to provide a diversity receiver.
The size of the receiver can be miniaturized and the cost of the receiver can be reduced without degradation of the diversity effect.
This permits the disadvantages described above to be eliminated.
The object described above is achieved by a diversity receiver respectively receiving signals in two branches, the diversity receiver comprising: two demodulating sections for producing respective amplitude and phases of received signals at a symbol unit; a memory access section for providing an amplitude ratio corresponding to the amplitude of the received signals and a phase difference between the phases of the received signals; a storage section for storing at least one relative phase difference between a phase of a vector-combined signal, which was based on the received signals and one of the phases of the received signals at an address designated by the amplitude ratio and the phase difference of the received signals, the phase of the vector-combined signal being previously calculated based on the amplitude ratio, the phase difference, and the one of the phases of the received signals; and an adding section for adding the relative phase difference produced from the storage section being addressed by the amplitude ratio and the phase difference produced from the memory access section to the one of the phases of the received signals to produce the phase of the vector-combined signal combined based on the received signals.
According to the above-mentioned diversity receiver, degradation of the transmission performance due to noise occurring in each branch may be reduced by the vector-combining of the received signals.
Further, in the diversity process, the relative phase difference may be obtained by only accessing the storage section with the amplitude ratio and the phase difference of the received signals without the calculating process.
The phase of the vector-combined signal may be obtained by only the addition of the relative phase difference and the one of the phases of the received signals