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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

蘭榕, 胡欣, 鄒峰, 王剛, 羅積潤. 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[J]. 電子與信息學(xué)報(bào), 2020, 42(5): 1274-1280. doi: 10.11999/JEIT190105
引用本文: 蘭榕, 胡欣, 鄒峰, 王剛, 羅積潤. 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[J]. 電子與信息學(xué)報(bào), 2020, 42(5): 1274-1280. doi: 10.11999/JEIT190105
Rong LAN, Xin HU, Feng ZOU, Gang WANG, Jirun LUO. Research of Low Sampling Frequency Broadband Digital Predistortion with Cyclostationary Characteristics[J]. Journal of Electronics & Information Technology, 2020, 42(5): 1274-1280. doi: 10.11999/JEIT190105
Citation: Rong LAN, Xin HU, Feng ZOU, Gang WANG, Jirun LUO. Research of Low Sampling Frequency Broadband Digital Predistortion with Cyclostationary Characteristics[J]. Journal of Electronics & Information Technology, 2020, 42(5): 1274-1280. 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
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

Research of Low Sampling Frequency Broadband Digital Predistortion with Cyclostationary Characteristics

  • 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。

  • 圖  1  實(shí)驗(yàn)電路框圖

    圖  2  不同采樣率下的預(yù)失真輸出頻譜

    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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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

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