Radio receiving method and apparatus
AssigneeNEC Corporation
InventorMakoto Tsurumaru
Life of this patent
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Abstract
The invention provides a radio receiving method and apparatus by which adjustment of a reception frequency when a radio modulation signal of a PSK system is received is realized by simple processing. Phase data is sampled out in a predetermined cycle from a random received modulation signal and cumulatively added for a predetermined period, and the reception frequency is adjusted so that a calculation result of the cumulative addition may satisfy a predetermined allowance range. Consequently, the reception frequency can be adjusted by simple processing without detecting a phase error from the modulation signal.
Claims7
A radio receiving method wherein a radio modulation signal of a PSK system transmitted by radio with a predetermined frequency is received and the reception frequency of the modulation signal is adjusted to a transmission frequency, comprising the steps of:
- producing a sampling clock of a cycle equal to 1/n of a symbol clock of a received radio modulation signal, n being an integer;
- detecting a pair of phase data included in a pair of radio modulation signals received by a pair of communication antennae individually in the cycle of the sampling clock;
- diversity composing the pair of detected phase data at a ratio in response to electric field strengths of radio reception of said communication antennae;
- cumulatively adding the composed data for a predetermined period;
- and
- adjusting the reception frequency so that a calculation result of the cumulative addition may satisfy a predetermined allowance range.
A radio receiving apparatus which receives a radio modulation signal of a PSK system transmitted with a predetermined frequency and adjusted a reception frequency of the modulation signal corresponding to a transmission frequency, comprising:
- clock production means for producing a sampling clock of a cycle equal to 1/n of a symbol clock of a received radio modulation signal, n being an integer;
- data detection means for detecting a pair of phase data included in a pair of radio modulation signals received by a pair of communication antennae individually in the cycle of the sampling clock;
- composing means for diversity composing the pair of detected phase data at a ratio in response to electric field strengths of radio reception of said communication antennae;
- phase accumulation means for cumulatively adding the composed data for a predetermined period;
- and
- reception adjustment means for adjusting a reception frequency so that a calculation result of the cumulative addition may satisfy a predetermined allowance range.
Dependencies are inferred from the claim text.