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Self-adapting analog quadrature modulation disbalance compensation method and device

A technology of quadrature modulation and compensation device, applied in computing models, biological models, instruments, etc., can solve problems such as the influence of digital pre-distortion performance, achieve strong global search capabilities, improve performance, and reduce hardware implementation complexity and calculation effect of complexity

Active Publication Date: 2008-09-24
WUHAN HONGXIN TELECOMM TECH CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide an analog quadrature modulation imbalance compensation method and device, especially an adaptive analog quadrature modulation imbalance compensation method and device in a broadband digital predistortion system, so as to solve the impact of the non-ideal characteristics of AQM on digital The performance impact problem of pre-distortion, the method and device of the present invention can effectively solve the AQM imbalance problem, and quickly optimize the dynamic compensation globally, thereby improving the performance of the wideband digital pre-distortion system

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  • Self-adapting analog quadrature modulation disbalance compensation method and device
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  • Self-adapting analog quadrature modulation disbalance compensation method and device

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specific Embodiment

[0019] Such as figure 2 Shown is a diagram of the AQM imbalance compensation device of the DPD direct up-conversion transmitter system of the present invention. The adaptive analog quadrature modulation imbalance compensation device in the broadband digital predistortion system includes: a baseband signal module 201, a DPD module 202, an adaptive AQM compensator 203, a local oscillator connected to the AQM device 206 and the quadrature demodulator module 210 208 , RF transmit path 205 and feedback path 209 . Wherein the adaptive AQM compensator includes a QMC (QuadratureModulator Compensation, quadrature modulation compensation) unit 203a and an AQM compensation algorithm and a control unit 203b, the RF transmission path includes a DAC module 204, an AQM device 206 and a WPA module 207, and the feedback path includes a quadrature solution Regulator module 210 and ADC module 211. Baseband signal module 201 is used to produce OFDM baseband modulation I signal and Q signal; DP...

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Abstract

The invention discloses a self-adapting analog quadrature modulation unbalance compensating method and a device thereof. The device of the invention comprises a baseband signal module, a DPD module, a self-adapting analog quadrature modulation AQM compensator, a local oscillation (LO) and a RF transmission channel, and a feedback channel. The method of the invention comprises the steps that: an AQM compensation algorithm and a control unit are used for transmitting a training sequence signal to firstly judge whether a DAC is provided with quadrature modulation compensator QMC; then pre-distorted baseband si (t) and a sq (t) signal and baseband IB and a QB signal sent by a feedback loop are obtained, and then measured and compared; the particle swarm optimization (PSO) is applied to continuously adjusting the 6 compensating parameters until a target function reaches the global minimum; at last, a compensating parameter is applied to the QMC unit updated parameter to conduct a dynamic compensating process to the pre-distorted baseband si (t) and sq (t) signals, therefore, the AQM self-adapted unbalance compensation can be realized, and the performance of a broadband digital pre-distorted system is improved.

Description

technical field [0001] The invention relates to an analog quadrature modulation imbalance compensation method and device, in particular to an adaptive analog quadrature modulation imbalance compensation method and device in a broadband digital predistortion system. Background technique [0002] In the future next-generation mobile communication system, based on OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) modulation technology, the wideband digital predistortion system in the transmitter can improve the linearity of the wideband power amplifier and improve the work of the wideband power amplifier. Efficiency becomes a technical problem. At present, the linearization system of broadband power amplifiers based on digital predistortion technology is gradually becoming a research hotspot. [0003] With the rapid development of radio frequency integrated circuit technology, the direct conversion transmitter / receiver scheme based o...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03G06N3/00
Inventor 王建新
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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