Method for improving transmitter performance, storage medium and communication equipment

Abstract

The invention discloses a method for improving the performance of a transmitter, a storage medium and communication equipment, the transmitter comprises a transmitting link and a feedback circuit which are annularly connected, the method comprises the following steps: receiving a first signal by using the transmitting link, amplifying the first signal to obtain a second signal, and coupling the second signal to generate a feedback signal, wherein the power of the second signal meets a preset transmitting power condition; attenuating the feedback signal by using a feedback circuit, and inputting the attenuated feedback signal into a transmitting link, wherein the attenuation multiple gradually changes in the opening and closing process of the transmitter, transition between the deep negative feedback state and the normal transmitting state is carried out, and the direct current component in the first signal correspondingly changes when the attenuation multiple changes. Through the above mode, the method can improve the switching spectrum power of the adjacent channel, and reduces the carrier leakage caused by the attenuation change of the feedback signal.

Description

technical field [0001] The present application relates to the technical field of communication, and in particular to a method for improving the performance of a transmitter, a storage medium and a communication device. Background technique [0002] Terrestrial trunked radio (TETRA, Trans European Trunked Radio) products use time division duplexing (TDD, Time Division Duplexing,) working mode, the transmission signal switch moment, will produce spectrum expansion, interfere with other channels, so the TETRA protocol is not sensitive to adjacent channel switching Spectral power (ACPS, Adjacent Channel Power due to Switching Transients) index has strict requirements. Usually, the transmission link of TDD products needs to debug the switching sequence of unit circuits such as power amplifiers and RF switches at all levels, and control the rising and falling curves of the power amplifier voltage or the rising and falling curves of the fundamental frequency signal amplitude throug...

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Problems solved by technology

[0003] The inventors of this application have found in long-term research and development that due to the discreteness of device gain and impedance, the ACPS index of TETRA products is not stable enough in mass production. The situation where the index is critical; the schemes for improving the switching spectrum characteristics in the prior art include figure 1 and figure 2 The technical solution shown, figure 1 The circuit shown includes a linear voltage regulator circuit 11 and a dynamic current source 12. The linear voltage regulator circuit 11 includes an error amplifier 111, a feedback circuit 112, and a pass element 113; this design can reduce the rate of change of the output voltage and prevent it from being faster It is close to the power supply voltage Vdd, maintains the saturation of the pass element 113, and significantly improves the switching spectrum characteristics of the power amplifier, but the electrical parameter for feedback and control is the voltage of the power amplifier, and the application effect in the transmitting system of the multi-level unit circuit is general; figure 2 In the structure shown, according to the relationship between the modulated signal and the radio frequency output signal using Enhanced Data Rate for Global System For Mobile Communications Evolution (EDGE, Enhanced Data Rate for Global System For Mobile Communications Evolition), the filling bits are optimized; the optimized The stuffing bits and effective data modulation bits are synthesized into modulation bits; and the optimized up-switching spectrum and down-switching spectrum are obtained by using the synthesized modulation bits; however, this design changes the signal during baseband digital modulation, and there is a problem of consistency in batch machine indicators. The application effect is general in products with a wide operating frequency range; in the solutions provided by the prior art, the transmitting chain usually contains multi-level unit circuits, and each unit circuit may have a state where the slope of the gain curve suddenly increases, and each unit circuit Gains at different frequency points are different. In the case of a wide operating frequency range, the ACPS index is difficult to debug. In addition, the gain or impedance of the device is discrete, which affects the index consistency of batch machines and causes performance deterioration.

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