Linearized control device and method for power amplifier of time division duplex system
A time division duplex system, power amplifier technology, applied in the direction of transmission control/equalization, etc., can solve the problem of optimal linearity of the power amplifier, and achieve the effect of linearization
Inactive Publication Date: 2008-01-30
BEIJING XINWEI TELECOM TECH
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Problems solved by technology
[0012] The technical problem to be solved by the present invention is to propose a linearization control device and method for a power amplifier of a TDD system, and to solve the problem that the linearization of the power amplifier cannot be optimized in a TDD system by using the existing linearization technology
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[0034] The block diagram of the basic control device of the linearization technology adopted in the present invention is as shown in Figure 3, by increasing the power amplifier opening time information unit, the rising edge or falling edge of the TTL level for controlling the opening and closing of the power amplifier is timed, The information on the turn-on time of the power amplifier is obtained, thereby introducing a time amount ΔT representing the turn-on time of the power amplifier. Therefore, the detection unit can detect the input signal and the output signal according to the time point, so that the detection result corresponds to the turn-on time of the power amplifier, and then sends the detection result to the control unit, and the control unit performs the detection on the data detected by the detection unit. Grouping and control, so as to generate and output each control coefficient C that changes with the opening time of the power amplifier j (ΔT), the core method...
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The invention discloses a linear control device and method used for a time division duplex system power amplifier, the control device comprises a detective unit used for detecting the input signals and the output signals and sending the data detected to the control unit, a control unit that is connected with the detective unit and is used for carrying out the adaptive algorithm and controlling the detected data by the detective unit, and an amplification opening time information unit that is connected with the control unit and is used for providing the amplification opening time information to the detective unit and the control unit; while the method comprises that the control unit sets the power amplifier amplification opening time into a plurality of sampling time points according to the amplification opening time information, the detective unit detects the input signals and the output signals on each sampling time point, the control unit carries out the correspondent adaptive algorithm and control according to the detected data. By applying the invention, the adaptive linear compensation of the power amplifier can be realized when the power amplifier is in an on-off state.
Description
technical field [0001] The invention relates to a linear power amplifier in a time division duplex (TDD) system, in particular to a control device and a method for improving the linearity of the power amplifier in the TDD system by using linearization technology. Background technique [0002] With the development of mobile communication systems, spectrum resources are becoming more and more scarce, so there are a variety of modulation methods that do not have constant envelope characteristics, such as quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM) etc. have received extensive attention. These modulation methods can save spectrum resources, but at the same time put forward higher requirements on the linearity of the power amplifier. If you still use a high-efficiency power amplifier such as Class C, due to its strong nonlinearity, it will cause amplitude and phase distortion of the signal within the signal bandwidth, reducing the performance of t...
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IPC IPC(8): H04B7/005
Inventor 陈肇雄刘烈海
Owner BEIJING XINWEI TELECOM TECH