Frequency scanning method for time division-synchronization code division multiple access (TD-SCDMA) system
A technology of TD-SCDMA and frequency scanning, applied in the transmission system, access restrictions, electrical components, etc., can solve the problems of deviation, data deviation, failure to be popularized and applied, etc., to achieve the effect of solving interference and reducing overhead
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[0022] The invention provides a method for frequency scanning in a TD-SCDMA system, such as Figure 1~4 Shown, including the following process -
[0023] First, determine the frequency sweep step size, automatic gain control (AGC) reference power and initial gain. Specifically, the reference power of its automatic gain control is obtained according to the input dynamic range of the A / D to ensure that the A / D input control is appropriate. Moreover, the initial gain can be set to meet the dynamic range of -55dbm to -85dbm, so that the automatic gain will not be saturated or too weak, causing distortion of the characteristic window. At the same time, the initial gain is the signal strength most often received by the TD-SCDMA system terminal.
[0024] Subsequently, starting from any time, the subframe signal data is received on a certain carrier frequency with a certain gain value, and the initial gain is performed for the first time. Specifically, the subframe signal is compos...
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