一種低峰均功率比的數(shù)字梳狀譜模塊設(shè)計
電子技術(shù)應(yīng)用
秘志賀,鄭宏斌
中國電子科技集團公司第十三研究所
摘要: 為了提高多通道接收機的通道間誤差校準(zhǔn)效率,,設(shè)計并實現(xiàn)了一種低峰均功率比的數(shù)字梳狀譜校準(zhǔn)源模塊。該模塊基于FPGA+DAC的硬件結(jié)構(gòu),,采用軟件DDS原理方式來產(chǎn)生梳狀譜信號,。為了降低梳狀譜信號的峰均功率比,利用遺傳算法對信號的各個子載波的初始相位進(jìn)行了優(yōu)化,,計算出一組優(yōu)于代數(shù)次優(yōu)解的初始相位組合,,將峰均功率比從次優(yōu)解的4.98 dB降低到了3.98 dB,同時提高了梳狀譜信號的子載波功率和帶外雜散抑制,,優(yōu)化了梳狀譜模塊的信號質(zhì)量,。該模塊在梳狀譜信號輸出范圍170 MHz~230 MHz,,頻譜間隔1 MHz情況下,子載波功率為-35.5 dBm,,帶外雜散抑制為64 dBc,,完全滿足校準(zhǔn)源指標(biāo)要求。
中圖分類號:TN79 文獻(xiàn)標(biāo)志碼:A DOI: 10.16157/j.issn.0258-7998.234500
中文引用格式: 秘志賀,,鄭宏斌. 一種低峰均功率比的數(shù)字梳狀譜模塊設(shè)計[J]. 電子技術(shù)應(yīng)用,,2024,50(5):13-18.
英文引用格式: Mi Zhihe,,Zheng Hongbin. Design of a digital comb spectrum module with low peak to average power ratio[J]. Application of Electronic Technique,,2024,50(5):13-18.
中文引用格式: 秘志賀,,鄭宏斌. 一種低峰均功率比的數(shù)字梳狀譜模塊設(shè)計[J]. 電子技術(shù)應(yīng)用,,2024,50(5):13-18.
英文引用格式: Mi Zhihe,,Zheng Hongbin. Design of a digital comb spectrum module with low peak to average power ratio[J]. Application of Electronic Technique,,2024,50(5):13-18.
Design of a digital comb spectrum module with low peak to average power ratio
Mi Zhihe,,Zheng Hongbin
The 13th Research Institute,, CETC
Abstract: In order to improve the calibration efficiency of inter-channel error of multi-channel receiver,a digital comb spectrum calibration source module with low peak to average power ratio(PAPR) is designed and implemented. This module is based on the hardware structure of FPGA+DAC and uses the DDS principle to generate comb spectrum signal. In order to reduce the PAPR of the comb spectrum signal, the genetic algorithm is used to optimize the initial phase of each subcarrier of the signal, and a group of initial phase combination which is better than the algebraic suboptimal solution is calculated. The PAPR is reduced from 4.98 dB of the suboptimal solution to 3.98 dB, and the subcarrier power and outside pass-band spur suppression of the comb spectrum signal are improved, optimizing the signal quality of the comb spectrum module. When the output range of the comb spectrum signal is170 MHz ~230 MHz with the spectrum interval of 1 MHz, the subcarrier power is -35.5 dBm and the outside pass-band spur suppression is 64 dBc, which fully meets the requirements of the calibration source.
Key words : comb spectrum,;genetic algorithm,;peak to average power ratio;FPGA
引言
多通道機接收機常常采用微波校正源對接收機進(jìn)行校準(zhǔn)以消除通道間的相位和幅度等誤差,。常用的校準(zhǔn)信號形式有單載波,、梳狀譜等[1],單載波形式的校正源在同一時刻只能輸出一個頻率點,,這使得多通道接收機的校正時間較長,,影響接收機的工作實時性[2]。為了縮短接收機通道校準(zhǔn)的時間,,提高接收機的工作效率,,可以采用梳狀譜形式的校正源,可以同時輸出多根譜線,,大大提高校準(zhǔn)效率,。
經(jīng)典的梳狀譜發(fā)生器一般以阻容等非線性器件為基礎(chǔ),利用非線性特性實現(xiàn)一定周期的脈沖信號輸出從而獲得各次諧波的梳狀譜信號[3],。但基于常規(guī)的非線性模擬器件難以做到高平坦度,、窄步進(jìn)等指標(biāo),且具有調(diào)試復(fù)雜,、移植性差,、頻譜間隔不可調(diào)等缺點[4]。相比基于軟件無線電形式的數(shù)字梳狀譜結(jié)構(gòu)簡單且能夠通過軟件方便靈活地對譜線數(shù)量和譜線間隔等進(jìn)行設(shè)置,,根據(jù)需求生成譜線,,更容易滿足指標(biāo)要求。
本文詳細(xì)內(nèi)容請下載:
http://forexkbc.com/resource/share/2000005980
作者信息:
秘志賀,,鄭宏斌
(中國電子科技集團公司第十三研究所,,河北 石家莊 050051)
此內(nèi)容為AET網(wǎng)站原創(chuàng),,未經(jīng)授權(quán)禁止轉(zhuǎn)載。