Synchronizing method and apparatus for TD-SCDMA direct amplifying station with high interference inhibiting ability
A TD-SCDMA, high anti-interference technology, applied in the communication between multiple stations, etc., can solve the problems of low anti-interference ability, strong anti-interference ability, and inability to synchronize base stations
Active Publication Date: 2013-03-27
成都芯通软件有限公司
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Problems solved by technology
[0003] 1. GPS synchronization, the advantage is: strong anti-interference ability; the disadvantage is: first, it needs to calculate the phase difference between GPS and the base station, which needs to be calculated separately for each repeater, and once there is a change, it needs to be adjusted again; once the signal If it is lost, it cannot be synchronized with the base station; the second is the high cost
[0004] 2. Baseband synchronization, the advantage is: strong anti-interference ability, the disadvantage is: high cost
[0005] 3. Envelope detection synchronization, the advantage is: low cost; the disadvantage is: low anti-interference ability
[0006] Since the envelope detection synchronization method has low cost but low anti-interference ability, this invention proposes a solution with high anti-interference ability
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[0018] See the realization method of the present invention figure 1 , figure 2 , image 3 :
[0019] In the TD-SCDMA repeater system, when the synchronization signal is not detected, the synchronization time needs to be maintained for 5 to 60 seconds (according to the industry standard). Therefore, when the synchronization signal is lost, within the time of maintaining synchronization, Need to be able to try all voltage thresholds. See the synchronization flowchart image 3 .
[0020] The first step is to set a timer T. The timing time setting requirement of the timer is: at least greater than or equal to the length of one subframe, that is, greater than 5 ms. Because at least one voltage decision threshold needs to be tried in one sub-frame length. According to the accuracy of the N bits of the ADC, the maintenance time length is N*T. According to the common ADC accuracy of 8 to 12 bits, a voltage judgment threshold detection time is 1 to 2 frames, that is, at least the requ...
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The invention discloses a synchronizing method of a TD-SCDMA repeater having strong anti-disturbance capacity and a device thereof. A dynamic voltage determined threshold regulation method is used for detecting synchronous signals. Radio-frequency signals are coupled to a radio-frequency wave detector by a radio-frequency coupler and then analog voltage signals are generated to an ADC converter. The ADC converter converts the analog voltage signals into digital signals to an FPGA. In the FPGA, a voltage determined threshold is set and compared with the digital signals converted by the ADC. If no synchronous signal is detected in a given time, minimum stepping is used for adjusting the voltage determined thresholds till the synchronous signal is detected; when the synchronous signal is detected, the current voltage determined threshold is maintained till no synchronous signal is detected again. The method maintains the synchronization for 5s to 60s after no synchronous signal is detected and continues adjusting the voltage determined thresholds in the maintaining period to detect the synchronous signal, thus ensuring that in the maintaining period, all the voltage determined thresholds are tried so as to enhance the capacity of anti-disturbance.
Description
Technical field [0001] The invention relates to a TD-SCDMA repeater synchronization method and device with high anti-interference ability. Background technique [0002] In the TD-SCDMA system, synchronization methods are mainly divided into the following three types: [0003] 1. GPS synchronization, the advantage is: strong anti-interference ability; the disadvantage is: one is that the phase difference between GPS and the base station needs to be calculated, and each repeater needs to be calculated separately, and once there is a change, it needs to be adjusted again; once the signal If it is lost, it cannot synchronize with the base station; the second is the high cost. [0004] 2. Baseband synchronization, the advantage is: strong anti-interference ability, but the disadvantage is: high cost. [0005] 3. The envelope detection synchronization has the advantages: low cost; the disadvantages: low anti-interference ability. [0006] Since the envelope detection synchronization method ...
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IPC IPC(8): H04B7/26
Inventor 冯云
Owner 成都芯通软件有限公司