Method for receiving digital radio signals and a digital radio s

Details Method for receiving digital radio signals and a digital radio s Method for receiving digital radio signals and a digital radio s

1994-11-28

1999-10-05

Pham, Chi H.

Pulse or digital communications

Testing

Signal noise

371 51, 4552262, 375355, H04B 346, H04B 1700

Patent

active

059635908

ABSTRACT:
A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides a sampling rate based on the bit error ratio and changes a number of bits of each shift register in the differential detector part to adapt the sampling rate. A sampling clock selector part selects one clock signal among four different frequency clock signals based on the decision of the sampling rate changing part and gives selected clock signal to the differential detector part as a sampling clock. The differential detector part makes demodulation in DQPSK (Differential Quadrilateral Phase Shift Keying). Since the error ratio is always maintained within a predetermined extent, a good voice quality is obtained. Since the sampling rate will not increase to unnecessarily high levels, power saving can be achieved and a consumption of batteries is reduced.

REFERENCES:
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patent: 5280538 (1994-01-01), Kataoka et al.
Electronics Information and Communication Assoication, Fall 1990 National Conference, "Structure and Performance of the B/300 p/4-Shift QPSK Baseband Differential Detector", by Denno, Sawahashi and Saito, of NTT Radio Communications Systems Laboratories.

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