Receiving apparatus, electromagnetic wave timepiece, receiving module and receiving method
A receiving apparatus includes: a receiver receiving a communication signal from a base station and including pilot and sync channel signals in which predetermined data strings continue periodically; a synchronizer acquiring synchronization information for communicating with the base station from the pilot channel signal and, based on the synchronization information, synchronizing with the communication signal; a data acquirer demodulating the sync channel signal from the synchronized communication signal and, by decoding the demodulated sync channel signal, acquiring sync channel signal data; an inference unit inferring a location in the data string of the acquired data by comparing the acquired data with data acquired and held before the acquired data and including the data string; a calculator calculating a time until receiving a next data string head from the inferred location in the data string; and a controller halting the reception of the communication signal based on the calculated time.
1. A receiving apparatus comprising:
a receiver which receives a communication signal, transmitted from a base station by a predetermined communication method, which includes a pilot channel signal and a sync channel signal in which predetermined data strings continue periodically,
a synchronizer which acquires synchronization information for communicating with the base station from the pilot channel signal included in the communication signal and, based on the acquired synchronization information, obtains synchronization with the communication signal,
a data acquirer which demodulates the sync channel signal from the communication signal with which the synchronization has been obtained and, by decoding the demodulated sync channel signal, acquires data of the sync channel signal,
an inference unit which, by comparing the acquired data with data, including the data string, which are acquired before the acquired data and held, infers a location in the data string of the acquired data,
a calculator which, from the inferred location in the data string, calculates a time period required until receiving a head of a next data string, and
a controller which, based on the calculated time period, controls a halt of an operation relating to the reception of the communication signal.
2. The receiving apparatus according to claim 1 , wherein
the inference unit includes
a memory which stores the data string which acts as a reference, and
a comparator which compares the acquired data and the stored data string.
3. The receiving apparatus according to claim 2 , wherein
the data string includes one data area which includes at least information relating to a time, and another data area in which data are less likely to be updated in response to an elapse of time, and
the inference unit which determines whether or not the acquired data are included in the one data area by using a first area as a comparison object, and
determines whether or not the acquired data are included in the other data area by using a second area as a comparison object,
wherein
the first area is included in the information relating to the time indicated by the acquired data and is less frequently updated, and
the second area is included in information indicating a predetermined disposition pattern in the acquired data.
4. The receiving apparatus according to claim 1 , wherein
the controller, in the event that the calculated time period is shorter than a reference value, does not instruct the halt of the operation relating to the reception.
5. The receiving apparatus according to claim 1 , wherein
the predetermined communication method is a CDMA communication method.
6. An electromagnetic wave timepiece which receives a communication signal including the time information, comprising:
the receiving apparatus according to claim 1 .
7. A receiving module comprising:
a receiver which receives a communication signal, transmitted from a base station by a predetermined communication method, which includes a pilot channel signal and a sync channel signal in which predetermined data strings continue periodically,
a synchronizer which acquires synchronization information for communicating with the base station from the pilot channel signal included in the communication signal and, based on the acquired synchronization information, obtains synchronization with the communication signal,
a data acquirer which demodulates the sync channel signal from the communication signal with which the synchronization has been obtained and, by decoding the demodulated sync channel signal, acquires data of the sync channel signal,
an inference unit which, by comparing the acquired data with data, including the data string, which are acquired before the acquired data and held, infers a location in the data string of the acquired data,
a calculator which, from the inferred location in the data string, calculates a time period required until receiving a head of a next data string, and
a controller which, based on the calculated time period, controls a halt of an operation relating to the reception of the communication signal.
8. A receiving method comprising:
receiving a communication signal, transmitted from a base station by a predetermined communication method, which includes a pilot channel signal and a sync channel signal in which predetermined data strings continue periodically,
acquiring synchronization information for communicating with the base station from the pilot channel signal included in the communication signal and, based on the acquired synchronization information, obtaining synchronization with the communication signal,
demodulating the sync channel signal from the communication signal with which the synchronization has been obtained and, by decoding the demodulated sync channel signal, acquiring data of the sync channel signal,
by comparing the acquired data with data, including the data string, which are acquired before the acquired data and held, inferring a location in the data string of the acquired data,
from the inferred location in the data string, calculating a time period required until receiving a head of a next data string, and
based on the calculated time period, controlling a halt of an operation relating to the reception of the communication signal.