Method and system for debugging time-division duplex system power amplifier linearity

Abstract

The invention discloses a method and system for adjusting TDD system power amplifier linear. The system comprises an expected adjusting power amplifier, a radiofrequency signal source used to input the radiofrequency signal to the expected power amplifier and a frequency spectrograph used to measure the output signal power and the ACLR value of the expected adjusting power; the system also comprises a receiving-and-sending switch control signal generator used to output the switch control signal of the simulating TDD system time slot and control the switch condition of the synchronous working of the radiofrequency signal source, the expected adjusting power and the frequency spectrograph by the switch control signal; the output end of the receiving-and-sending switch control signal generator is connected with the external trigger input interface of the radiofrequency signal source, the external trigger input interface of frequency spectrograph and the control circuit of the expected adjusting power.

Description

technical field [0001] The invention relates to the field of time division duplex (TDD) wireless communication systems, in particular to a method for debugging the linearity of a TDD system power amplifier. Background technique [0002] In recent years, with the development of communication systems, Time Division Duplex (TDD) wireless communication systems have been widely used. Since the TDD system adopts code division multiple access (CDMA) technology, it has great requirements on the linearity of the power amplifier (abbreviated as power amplifier). Generally, the adjacent channel power leakage ratio (ACLR) is used as the indicator of the linearity of the power amplifier. ACLR refers to the ratio of the adjacent channel power in the output signal amplified by the power amplifier to the main channel power of the output signal. When the ACLR value reaches the minimum, it is considered that the linearity of the power amplifier is optimal. [0003] In the prior art, the lin...

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Problems solved by technology

And because the power amplifier tube itself is continuously turned on and off in the pulse working mode and the characteristics of the power amplifier's continuous on working state, under the condition that the power amplifier is normally on, when a continuous modulation signal is input to adjust the bias voltage of the power amplifier tube, the power amplifier can be adjusted. The output linearity is the best, but under the condition that the power supply is continuously turned on and off in the TDD system, the normal TDD time slot modulation signal is input, and the ACLR value measured by the synchronous trigger gating of the spectrum analyzer is not necessarily optimal.

In summary, due to the different working states of the power amplifier during debugging and actual use, the linearity of the power amplifier under the optimal state of debugging cannot meet the requirements of the actual use of the TDD system

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