基于循環(huán)平穩(wěn)特性的欠采樣寬帶數(shù)字預(yù)失真研究

蘭榕; 胡欣; 鄒峰; 王剛; 羅積潤

doi:10.11999/JEIT190105

基于循環(huán)平穩(wěn)特性的欠采樣寬帶數(shù)字預(yù)失真研究

doi: 10.11999/JEIT190105

蘭榕^{1, 2},
胡欣³,
鄒峰¹,
王剛¹,
羅積潤^1, ,

1.
中國科學(xué)院電子學(xué)研究所北京 100190
2.
中國科學(xué)院大學(xué) 北京 100049
3.
北京郵電大學(xué) 北京 100876

詳細(xì)信息

作者簡(jiǎn)介:
蘭榕：男，1992年生，博士生，研究方向?yàn)樾胁ü芄β史糯笃鲗拵?shù)字預(yù)失真技術(shù)

胡欣：男，1985年生，工程師，研究方向?yàn)轱w行器航電綜合、衛(wèi)星通信、智能信號(hào)處理等

鄒峰：男，1983年生，工程師，研究方向?yàn)樾胁ü芊糯笃?/p>
王剛：男，1971年生，研究員，研究方向?yàn)槲⒉娮有畔⑾到y(tǒng)與電路

羅積潤：男，1957年生，研究員，研究方向?yàn)楦吖β饰⒉ǖ漠a(chǎn)生與應(yīng)用

通訊作者:
羅積潤　Luojirun@mail.ie.ac.cn

中圖分類號(hào): TN124
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出版歷程
- 收稿日期: 2019-02-25
- 修回日期: 2019-10-20
- 網(wǎng)絡(luò)出版日期: 2020-01-20
- 刊出日期: 2020-06-04

Research of Low Sampling Frequency Broadband Digital Predistortion with Cyclostationary Characteristics

Rong LAN^{1, 2},
Xin HU³,
Feng ZOU¹,
Gang WANG¹,
Jirun LUO^{1
, ,}

1.
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Beijing University of Posts and Telecommunications, Beijing 100876, China

摘要

摘要:
為了解決行波管(TWT)寬帶數(shù)字預(yù)失真(DPD)中反饋回路ADC采樣率過高的問題，該文利用信號(hào)的循環(huán)平穩(wěn)特性證實(shí)可通過欠采樣下的輸出信號(hào)估計(jì)功放的非線性模型參數(shù)，然后由功放非線性模型參數(shù)和輸入信號(hào)可恢復(fù)出與高采樣率下效果相似的功放輸出信號(hào)，最后通過傳統(tǒng)的間接學(xué)習(xí)結(jié)構(gòu)對(duì)功放進(jìn)行數(shù)字預(yù)失真以實(shí)現(xiàn)行波管的線性化。為了驗(yàn)證該方法，利用20 MHz LTE信號(hào)驅(qū)動(dòng)一只55 W的X波段行波管放大器(TWTA)。數(shù)字預(yù)失真反饋回路的ADC采樣率從61.44 Msps降低至6.144 Msps和3.072 Msps，但線性化效果變化不大，表明欠采樣方法是有效的。
- 行波管放大器 /
- 循環(huán)平穩(wěn) /
- 欠采樣 /
- 數(shù)字預(yù)失真 /
- 線性化
Abstract:
In order to reduce the sampling rate of the Traveling Wave Tube (TWT) of the Analog to Digital Converter (ADC) in the feedback loop of Digital PreDistortion (DPD), the nonlinear parameters of the power amplifier model are proved to be estimated with the undersampled output signal based on the cyclostationary of digital modulation signal. The output signal similar to high sampling rate can be obtained by combining the nonlinear parameters of the power amplifier model with the input signal. The DPD of the power amplifier is implemented through indirect learning architecture. To validate the method, a 55 W X-band Traveling Wave Tube Amplifier (TWTA) is driven by a 20 MHz LTE signal. The sampling rate of ADC in the DPD feedback loop is reduced from 61.44 Msps to 6.144 Msps and 3.072 Msps, but the linearization effect has little change, which shows the validation of the undersampling method.
- Traveling Wave Tube-Amplifier (TWTA) /
- Cyclostationary /
- Low sampling frequency /
- Digital PreDistortion (DPD) /
- Linearization

HTML全文

圖 1 實(shí)驗(yàn)電路框圖

下載: 全尺寸圖片幻燈片

圖 2 不同采樣率下的預(yù)失真輸出頻譜

下載: 全尺寸圖片幻燈片

表 1 不同采樣率下預(yù)失真的鄰近信道功率比

預(yù)失真采樣率(Msps)	ACPR-/+20 MHz(dBc)	ACPR-/+40 MHz(dBc)
無預(yù)失真	–19.24/–19.94	–37.84/–39.34
61.44	–47.42/–47.78	–49.30/49.00
6.144	–47.07/–47.55	–48.72/–48.15
3.072	–46.87/–46.40	–48.06/–48.40

下載: 導(dǎo)出CSV

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