Communication terminal device and spread code estimation method
First Claim
1. A communication terminal apparatus comprising:
- a receiving section that receives a signal spread and sent from a communication partner;
a despreading section that despreads the received signal using a plurality of spreading codes, which is made to correspond to midamble codes multiplexed into the signal received by said receiving section on a predetermined priority basis, in the priority order; and
a spreading code determining section that determines a spreading code used when the received signal is formed based on signal power after despreading.
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Accused Products
Abstract
It is determined whether a secondary spreading code is multiplexed based on a result obtained by despreading a data portion of a received signal using a primary spreading code corresponding to a midamble shift included in a received signal and a result obtained by despreading the data portion using the secondary spreading code corresponding to the primary spreading code. Moreover, among the spreading codes corresponding to the midamble shifts used in the own station, when the number of the midamble shifts allocated to the own station is multiple, the delay profiles generated by the midamble shifts used in the own station are normalized to power per spreading code and a threshold value for a midamble shift determination is set using the normalized delay profiles. This makes it possible to specify all spreading codes multiplexed into the received signal and improve accuracy in the midamble shift determination even when the number of spreading codes corresponding to the midamble shifts is multiple.
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Citations
9 Claims
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1. A communication terminal apparatus comprising:
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a receiving section that receives a signal spread and sent from a communication partner;
a despreading section that despreads the received signal using a plurality of spreading codes, which is made to correspond to midamble codes multiplexed into the signal received by said receiving section on a predetermined priority basis, in the priority order; and
a spreading code determining section that determines a spreading code used when the received signal is formed based on signal power after despreading. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A spreading code estimation method comprising:
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a receiving step of receiving a signal spread and sent from a communication partner;
a despreading step of despreading the received signal using a plurality of spreading codes, which is made to correspond to midamble codes multiplexed into the signal received by said receiving step on a predetermined priority basis, in the priority order; and
a spreading code determining step of determining a spreading code used when said received signal is formed based on signal power after despreading.
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Specification