Signal distortion pre-correction method, device and system and composite system
A signal distortion and pre-correction technology, applied in the field of systems and composite systems, can solve problems such as the influence of output load mismatch power amplifier characteristics, increase the structural complexity and volume of the transmitter, and increase power consumption, and meet the requirements of reducing characteristic consistency. Effect
Pending Publication Date: 2020-10-30
ZTE CORP
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Problems solved by technology
Moreover, in this system, since there is no circulator between the PA and the antenna element, the output load mismatch and the coupling interference between the antennas will have a great impact on the power amplifier characteristics, which also poses a greater challenge to the design of the predistorter. challenge
Traditional pre-distortion algorithms are more suitable for scenarios where one digital channel corresponds to one analog RF channel
In a Multiple In Multiple Out (MIMO) analog beamforming system, if the traditional predistortion method is used, the structural complexity and volume of the transmitter will be greatly increased, and its power consumption will also be increased.
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[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.
[0024] The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.
[0025] The industry has also proposed some solutions to the distortion pre-correction problem of the MIMO analog beamforming system. These schemes can pre-correct the nonlinear signal distortion in the multi-antenna analog beamforming system to a certain ...
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The invention discloses a signal distortion pre-correction device, method and system and a composite system. The signal distortion pre-correction method comprises the following steps: carrying out time-sharing acquisition on output signals of a plurality of channels of a power amplifier module to obtain a plurality of analog feedback signals; converting the plurality of analog feedback signals into a plurality of digital feedback signals; determining a correction parameter according to the plurality of digital feedback signals and an input forward signal; and correcting the forward signal based on the correction parameter to obtain a pre-correction signal. According to the scheme provided by the embodiment of the invention, correction parameter estimation is carried out on the basis of theplurality of feedback signals, so that the requirement on the characteristic consistency of each power amplifier in the system is reduced, and the problem of signal distortion pre-correction of a nonlinear system in an analog beamforming application scene can be well solved.
Description
technical field [0001] Embodiments of the present invention relate to but are not limited to a signal distortion pre-correction method and device, system and composite system. Background technique [0002] In modern mobile communication systems, multi-carrier transmission technology and high-order digital modulation methods will lead to higher peak-to-average ratio and larger signal transmission bandwidth of the system. When a power amplifier (Power Amplifier, PA) works in a near-saturation region, this situation will cause severe nonlinear distortion and memory effects on the PA. An effective way to avoid PA nonlinear distortion is to back off the power of the input signal, but this will greatly reduce the efficiency of the PA and increase its power consumption. Currently, digital predistortion technology has become the preferred method for nonlinear system distortion pre-correction because of its advantages of low cost and obvious distortion improvement effect. [0003] ...
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IPC IPC(8): H03F1/32H03F3/19H04B7/0413
CPCH03F3/19H03F1/3241H04B7/0413H03F1/3247H03F3/68H03F3/245H04B7/0617H03F1/0205H03F1/32H03F3/21H03F2201/3215
Inventor 李运华张哲远杜文豪宁东方张作锋戴征坚
Owner ZTE CORP