US 2003/0165132 A1Published application

System and method to adjust searcher threshold parameter of rake receiver

AssigneeBeno Corporation

InventorsLin Che-Li, Chen Sheng-Jie

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Abstract

This present invention is a system and method to adjust a searcher threshold parameter of a RAKE receiver. The adjusting system includes a searcher, a power estimator, and a parameter control apparatus. When the searcher finds and acquires a new path signal, the power estimator will estimate the power of the new path signal and that of the other path signals. The parameter control apparatus will calculate and monitor the power ratio corresponding to the new path signal. If the power ratio remains smaller than a predetermined power ratio parameter for a first predetermined times, the parameter control apparatus will increase the value of the threshold parameter. If the power ratio remains unchanged for a second predetermined times, the parameter control apparatus will lower the value of the threshold parameter. After that, the searcher will acquire the path signals among the multipath signal being searched in accordance with the adjusted threshold parameter. With this adjusted threshold parameter, the present invention can improve the sensitivity of the searcher, acquire the correct path signals in various environments, and provide the correct position of the path signal to the RAKE receiver.

Claims22

Dependent claims

An adjusting system for adjusting a threshold parameter in a wireless receiver, the wireless receiver receiving a plurality of external multipath signals in a predetermined time period to reconstruct correspondingly an original signal, the threshold parameter having a predetermined and adjustable value, the adjusting system comprising:

a searcher for searching the plurality of external multipath signals, and when a multipath signal is searched, acquiring from the multipath signal a plurality of path signals having signal power higher than the predetermined threshold parameter;
and
a power estimator for estimating the signal power of the multipath signal and the plurality of path signals;
and
a parameter control apparatus for calculating each power ratio of the plurality of path signals via the signal power of each path signal to the signal power of the multipath signal, the parameter control apparatus further storing a predetermined power ratio parameter for comparing with each power ratio of the plurality of path signals;
wherein when the searcher acquires a new path signal, the parameter control apparatus begins to monitor the power ratio of the new path signal, and wherein when the power ratio of the new path signal remains smaller than the predetermined power ratio parameter for a first predetermined times, the parameter control apparatus increases the value of the threshold parameter, and when the power ratio of the new path signal remains unchanged for a second predetermined times, the parameter control apparatus decreases the value of the threshold parameter, and the searcher afterwards acquires the path signals of the newly-searched multipath signal with the adjusted threshold parameter.

3 more elements

An adjusting method for adjusting a threshold parameter in a wireless receiver in a communication system, the wireless receiver receiving a plurality of external multipath signals in a predetermined time period to reconstruct correspondingly an original signal, and further storing a predetermined power ratio parameter, the threshold parameter having a predetermined and adjustable value, the adjusting method comprising:

searching the plurality of external multipath signals;
acquiring from, when a multipath signal is searched, the multipath signal a plurality of path signals having signal power higher than the predetermined threshold parameter;
estimating the signal power of the multipath signal and the plurality of path signals;
calculating each power ratio of the plurality of path signals via the signal power of each path signal to the signal power of the multipath signal;
comparing the predetermined power ratio parameter with each power ratio of the plurality of path signals;
beginning to, when a new path signal is acquired, monitor the power ratio of the new path signal;
and
increasing, when the power ratio of the new path signal remains smaller than the predetermined power ratio parameter for a first predetermined times, the value of the threshold parameter.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/377,453Filed 28 Feb 2003
Priority: TW 911037451 Mar 2002
Published: 4 Sep 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04B 1/70755
With code phase acquisition: setting of lock conditions, e.g. threshold
H04B 1/7113
The interference being multi-path interference: determination of path profile
H04B 1/7115
The interference being multi-path interference: constructive combining of multi-path signals, i.e. RAKE receivers
H04B 1/7117
Constructive combining of multi-path signals, i.e. RAKE receivers: selection, re-selection, allocation or re-allocation of paths to fingers, e.g.…