Method for cell initial search in a CDMA mobile communication system
First Claim
1. A cell initial search method for a CDMA digital mobile communication system so that user equipment correctly receives information sent by a base station, comprising:
- selecting a working frequency point by the user equipment; and
obtaining downlink synchronization with the base station at the working frequency point by;
(a) deciding a range of downlink training sequence timeslots by using a power characteristic window value method based on a training sequence; and
(b) obtaining accurate receiving position for the user equipment by calculating a correlation of received data and training sequences in the range.
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Accused Products
Abstract
The invention relates to a cell initial search method for user equipment (UE) in a CDMA digital cellular mobile communication system. The method includes: a UE after selecting a working frequency point, obtains downlink synchronization with the base station; and corrects carrier deviation between the UE and the base station. The downlink synchronization includes: deciding a range of downlink training sequence timeslot (DwPTS) based on training sequence power characteristic window value method; solving correlation of received data and training sequence in the range to obtain accurate receiving position of a UE. The correction of carrier deviation between a UE and the base station includes: estimating carrier deviation between a UE and the base station by software, recovering carrier frequency difference by using decision and feedback method to adjust hardware and carrier deviation correction method based on joint detection to correct carrier deviation.
16 Citations
19 Claims
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1. A cell initial search method for a CDMA digital mobile communication system so that user equipment correctly receives information sent by a base station, comprising:
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selecting a working frequency point by the user equipment; and
obtaining downlink synchronization with the base station at the working frequency point by;
(a) deciding a range of downlink training sequence timeslots by using a power characteristic window value method based on a training sequence; and
(b) obtaining accurate receiving position for the user equipment by calculating a correlation of received data and training sequences in the range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cell initial search method for a CDMA digital mobile communication system so that user equipment correctly receives information sent by a base station, comprising:
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tracing carrier deviation between the user equipment and the base station by the user equipment; and
correcting the carrier deviation in a digital demodulator of the user equipment by;
(a) estimating the carrier deviation by software, and adjusting the digital demodulator'"'"'s hardware by using a decision and feedback method; and
(b) suppressing multipath and multiple access interference and correcting the carrier deviation to a range required by baseband demodulation by using a carrier deviation correction method based on joint detection. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A cell initial search method for a CDMA digital mobile communication system, comprising:
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selecting a working frequency point by an user equipment and obtaining downlink synchronization with a base station at the working frequency point; and
tracing carrier deviation between the user equipment and the base station by the user equipment, and correcting the carrier deviation in a digital demodulator;
wherein obtaining downlink synchronization with a base station comprises;
(a) deciding a range of downlink training sequence timeslot first by using a power characteristic window value method based on a training sequence;
(b) obtaining an accurate receiving position of the user equipment by calculating correlation of data received and the training sequence in the range; and
(c) correcting the carrier deviation in a digital demodulator by;
(i) estimating the carrier deviation by software, and adjusting the digital demodulator'"'"'s hardware by using a decision and feedback method; and
(ii) suppressing multipath and multiple access interference by using a carrier deviation correction method based on joint detection, and correcting the carrier deviation to a range required by baseband demodulation.
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14. A cell initial search method for a CDMA digital mobile communication systems comprising:
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searching a rough position range of DwPTS by using a power characteristic window value method and defining a working frequency point;
searching accurate receiving position by solving a correlation calculation method in the position range defined and obtaining downlink synchronization; and
recovering carrier deviation by using a carrier deviation correction method based on joint detection. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification