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Multi-band broadband digital predistortion (DPD) lookup table generation method, DPD processing method and system

A multi-band, look-up table technology, applied in baseband system components, transmission systems, modulated carrier systems, etc., can solve problems such as affecting the DPD processing effect, and achieve the effect of improving the DPD processing effect and the difficulty of implementation.

Active Publication Date: 2015-03-11
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0009] Although the above schemes 1 and 2 both propose a dual-band DPD system structure, they are mainly implemented from the perspective of hardware, and they are not considered more from the perspective of the impact between the two frequency band signals on the DPD processing effect, which in turn affects the DPD. Processing effect

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  • Multi-band broadband digital predistortion (DPD) lookup table generation method, DPD processing method and system
  • Multi-band broadband digital predistortion (DPD) lookup table generation method, DPD processing method and system
  • Multi-band broadband digital predistortion (DPD) lookup table generation method, DPD processing method and system

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Embodiment Construction

[0035] In the second prior art solution, the same type of power amplifier is used for the two frequency bands, which greatly reduces the equipment cost, and a time division multiplexing strategy is adopted for different frequency bands of the feedback channel. Although this solution is applied to two frequency bands, DPD works at the digital intermediate frequency and uses multiple frequency band combined signals. When multiple frequency bands are widely spaced, the intermediate frequency sampling rate is very high, such as the two frequency bands suggested by this solution. They are 2.1GHz and 3.5GHz respectively, and the center carrier interval of the two frequency bands is 1.4GHz. Based on the Nyquist sampling theorem, regardless of the requirements of the DPD algorithm itself, the sampling rate needs to reach more than 3GHz. From the perspective of product implementation, there is no such FPGAs and DSPs with high-speed clocks are difficult to implement. For the two frequen...

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Abstract

Disclosed are a multi-band broadband DPD lookup table generation method, a DPD processing method and system. The DPD lookup table generation method comprises: inputting a first-band training signal and a second-band training signal, and capturing feedback signals of the first-band training signal and the second-band training signal; training a first-band DPD coefficient according to the feedback signal of the first-band training signal, a reference signal and the feedback signal of the second-band training signal; training a second-band DPD coefficient according to the feedback signal of the second-band training signal, a reference signal and the feedback signal of the first-band training signal; and generating a first-band lookup table according to the trained first-band DPD coefficient, and generating a second-band lookup table according to the trained second-band DPD coefficient. The present invention can be adopted to solve the problem of restrictions to the implementation of hardware for multi-band broadband DPD processing in the prior art.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for generating a multi-band broadband DPD lookup table, a DPD processing method and a system. Background technique [0002] With the high recognition of mobile operators at home and abroad and the large-scale commercial deployment in recent years, the network construction mode of BBU (Base Band Unit, baseband processing unit) + RRU (Radio Remote Unit, radio frequency remote unit) has shown fundamental changes Trends in traditional network architectures. Due to differences in spectrum policies in various countries and regions, the spectrum resources obtained by global mobile operators such as Vodafone, T-Mobile, Verizon Wireless, and China Mobile are relatively scattered (including 900MHz / 1800MHz / 2100MHz / 2300MHz / 2600MHz, etc.), and they are generally faced with multi-standard , Multi-band challenges. Taking China Mobile as an example, in the TD-SCDMA (Time-Di...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/49
CPCH03F1/3247H04L27/367
Inventor 陈东孙华荣熊芳王桂珍段滔肖鹏艾宝强马艳君
Owner DATANG MOBILE COMM EQUIP CO LTD
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