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Time diversity communications system
| Details |
Inventors: Ito, Shogo; Yamao, Yasushi; Ohkubo, Shinzo;
Assignee: NTT Mobile Communications Network Inc. (Tokyo, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Kincaid; Lester G.
Attorney, Agent or Firm: Cushman Darby & Cushman IP Group of Pillsbury Madison & Sutro LLP
A system wherein time diversity reception is performed for each error-corrected or error-detected code word without distinguishing between the address signal and the message signal, the code words being the units which make up the address and message signals. A received signal comprising correctly decoded code words is obtained by selecting code words that are judged to have been correctly decoded in accordance with error detecting/correcting logic from among code words with the same content that have been received a plurality of times. When a code word has been correctly decoded, part of the selective radio paging receiver is inhibited from working during the time intervals when correctly received code words would be received, thereby decreasing battery consumption. |
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DETAILED DESCRIPTION The present invention has been devised in the light of this situation, and has an object to provide a time diversity communications system which can further improve the probability of correct reception by a receiving device.
It is a further object of this invention to provide a time diversity communications system which, when applied to a selective radio paging system, gives a pager whereby the probability of receiving correctly can be further improved.
It is yet another object of this invention to provide a time diversity communications system which gives a pager with reduced battery consumption.
The distinguishing feature of this invention is that the address signal and the message signal each comprises a plurality of code words, and time diversity reception is performed for all the code words comprising a paging signal without distinguishing between the address signal and the message signal.
In other words, according to a first aspect, this invention is a time diversity communications system, the distinguishing feature of which is that it has: a transmitting device which, as time elapses, transmits code words with the same content repeated a plurality of times as radio signals, the code words having been encoded in accordance with an error correcting or error detecting logic; and a receiving device which receives the aforementioned code words and decodes them in accordance with the error correcting or error detecting logic; this receiving device selects, from among code words with the same content that have been received over a plurality of times, those code words that are judged to have been correctly decoded in accordance with the error correcting or error detecting logic.
The above-described device makes it possible to perform time diversity reception wherein, from among code words with the same content that have been received over a plurality of times, code words without error are selected, so that the probability of receiving correctly can be improved.
The aforementioned selecting means should select, from among code words with the same content that have been received over a plurality of times, and from among code words that are judged to have been correctly decoded in accordance with the aforementioned error correcting logic, those code words with the smallest number of error-corrected bits
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