초록 ▼

An adaptive CDMA sequential detection method is provided. The method permits the use of the sequential detection process to determine an unknown spreading code in an environment where the signal to noise ratio of the received signal varies. A communication system, such as W-CDMA, provides a periodic

An adaptive CDMA sequential detection method is provided. The method permits the use of the sequential detection process to determine an unknown spreading code in an environment where the signal to noise ratio of the received signal varies. A communication system, such as W-CDMA, provides a periodic reference signal that the receiver can demodulate without the spreading code. The reference signal is used to estimate and constantly update the signal to noise calculation. From this estimate a bias is updated for use in the sequential detection of the spreading code. A system to update the CDMA sequential detector bias value is also provided.

대표청구항 ▼

[What is claimed is:] [1.]a) despreading the received channel with a candidate long code;b) continuously integrating the output of the despreading process of Step a);c) adding a bias to the integrated output of Step b);d) establishing an acceptance threshold;e) comparing the biased integrated output

[What is claimed is:] [1.]a) despreading the received channel with a candidate long code;b) continuously integrating the output of the despreading process of Step a);c) adding a bias to the integrated output of Step b);d) establishing an acceptance threshold;e) comparing the biased integrated output to the acceptance threshold; andf) selecting a candidate long code as the first long code in response to the comparison of Step e), whereby the base station is acquired.