Digital pre-distortion (DPD) parameter monitoring device and method

A technology of digital predistortion and monitoring device, applied in the field of RRU, can solve the problems of spectrum regeneration, signal interference, reduce the output power of power amplifier, etc., and achieve the effect of improving stability

Active Publication Date: 2012-07-11
ZTE CORP
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  • Claims
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Problems solved by technology

[0002] The wireless communication system adopts BPSK (Binary Phase Shift Keying, binary phase shift keying), QPSK (Quadrature Phase Shift Keying, quadrature phase shift keying), 16QAM (Quadrature Amplitude Modulation, quadrature amplitude keying) with high spectrum utilization Control), 64QAM and other modulation methods, these modulation methods not only modulate the phase of the carrier, but also modulate the amplitude of the carrier, these modulation methods will generate a non-constant envelope modulation signal with a large peak-to-average ratio The signal wil

Method used

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  • Digital pre-distortion (DPD) parameter monitoring device and method

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Embodiment 1

[0046] like figure 2As shown, the DPD parameter monitoring device of this embodiment mainly includes the following modules: a DPD parameter correctness check module, a DPD parameter validity check module, a DPD parameter gain and phase compensation module, and a DPD parameter to other power gears Copied module.

[0047] The DPD parameter correctness checking module includes but is not limited to one or a combination of any of the following checks. As long as one of these checks exceeds the judgment threshold, the DPD parameters need to be recalculated.

[0048] a1) Overflow judgment of DPD parameters. The DPD parameter value needs to be within a reasonable range. When the DPD parameter value exceeds a certain range, it will be judged as an abnormal DPD parameter.

[0049] a2) Judgment that the average power compensation of DPD parameter exceeds the limit. DPD digital domain processing may bring a certain gain, but when the gain is too large, it may cause overflow and damag...

Embodiment 2

[0059] In this embodiment, for a DPD system without power grading, that is, when the power is always in the same gear, the above-mentioned monitoring device is used to monitor the DPD parameters obtained by training. like image 3 The specific process is described as follows:

[0060] 1) The DPD parameters generated by the DPD parameter obtaining module enter the DPD parameter correctness checking module and the DPD parameter validity checking module respectively. The DPD parameter correctness checking module includes: overflow judgment of DPD parameters; Limit judgment; DPD parameter peak power compensation over-limit judgment; data correlation check before and after DPD processing. The DPD parameter validity check module includes: pre-checking the DPD parameters in the time domain and post-checking in the frequency domain.

[0061] 2) After passing the correctness and validity check, enter the DPD parameter gain and phase compensation module, otherwise return to the DPD pa...

Embodiment 3

[0065] For a DPD system with power grades, the power will fluctuate in different gears, the monitoring device proposed in the present invention is used to monitor the DPD parameters obtained by training. like Figure 4 The specific process is described as follows:

[0066] 1) The DPD parameters generated by the DPD parameter obtaining module enter the DPD parameter correctness checking module and the DPD parameter validity checking module respectively. The DPD parameter correctness checking module includes: overflow judgment of DPD parameters; Limit judgment; DPD parameter peak power compensation over-limit judgment; data correlation check before and after DPD processing. The DPD parameter validity check module includes: pre-checking the DPD parameters in the time domain and post-checking in the frequency domain.

[0067] 2) After passing the correctness and validity check, enter the DPD parameter gain and phase compensation module, otherwise return to the DPD parameter obta...

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Abstract

The invention discloses a digital pre-distortion (DPD) parameter monitoring device and method. The device is connected with a DPD parameter obtaining module and a PDP processing module respectively, is used for rectifying the correctness and effectiveness of PDP parameters obtained by the DPD parameter obtaining module and outputs the PDP parameters passing the correctness verification and effectiveness verification to the PDP processing module for PDP processing. By adopting the device and method provided by the invention, the PDP parameters obtained by the DPD parameter obtaining module can be monitored, the stability and reliability of the DPD parameters for pre-distortion are ensured, and the stability of adjacent channel power ratio (ACPR) index of a power amplifier output signal can be further ensured.

Description

technical field [0001] The present invention relates to an RRU (Radio Remote Unit, radio remote unit) of a base station of a wireless communication system, and in particular, to a digital predistortion parameter monitoring device and method. Background technique [0002] The wireless communication system adopts BPSK (Binary Phase Shift Keying, Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation, Quadrature Amplitude Keying) with high spectrum utilization. These modulation methods not only modulate the phase of the carrier, but also modulate the amplitude of the carrier. These modulation methods will generate non-constant envelope modulation signals with a larger peak-to-average ratio. The signal will cause some semiconductor devices of the power amplifier to work in the nonlinear region, which will produce serious intermodulation components, which will cause interference between signals in th...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04L25/49
Inventor 孟龙朱士涛
Owner ZTE CORP
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