Method for restraining frequency deviation exceeding and mobile terminal
A mobile terminal, first-time technology, applied in the transmitter/receiver shaping network, electrical components, baseband system components, etc., can solve the problem of deteriorating AFC steady-state performance, mobile terminal frequency deviation range, etc.
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Embodiment 1
[0014] figure 1 It is a schematic diagram of a mobile terminal for adaptively adjusting the bandwidth of an AFC loop filter according to Embodiment 1 of the present invention. Such as figure 1 As shown, the mobile terminal includes a detection unit 100 and a bandwidth control unit 102 . Wherein the detection unit 100 is used to detect whether the mobile terminal accesses the base station with the maximum power or whether the transmission power increase value of the adjacent time slot of the power amplifier of the mobile terminal exceeds a preset threshold; the bandwidth control unit 102 is used for if the mobile terminal The transmission power increase value of the adjacent time slot of the power access base station or mobile terminal power amplifier exceeds a preset threshold, and the bandwidth of the automatic frequency offset control AFC loop filter is adjusted from the first bandwidth to the second bandwidth; after the first After a period of time, the bandwidth of the A...
Embodiment 2
[0019] figure 2 It is a flowchart of a method for adaptively adjusting the bandwidth of an AFC loop filter according to Embodiment 2 of the present invention. figure 2 The specific workflow of the program is as follows:
[0020] Step 200, detect whether the PA of the mobile terminal accesses the base station with the maximum power, if yes, enter step 202, increase the AFC loop filter bandwidth f_AFC from the initial value f0 to a new value f1, and start a timer at the same time, enter Step 204, judge whether the timer is reset, if not reset, wait for the timer reset, enter step 204 again, if the timer reset, enter step 206, the AFC loop filter bandwidth is transferred back to the AFC loop filter bandwidth initial value f0 .
[0021] figure 2 Among them, f0 and f1 respectively represent the value of the loop filter bandwidth f_AFC under different conditions, and f1>f0, T is the step size of the timer. There is no specific limit on how much f1 is to be chosen. In actual o...
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