一種橢圓球面波調(diào)制信號(hào)自適應(yīng)峰均比抑制方法

王紅星; 陸發(fā)平; 劉傳輝; 劉曉

doi:10.11999/JEIT160139

一種橢圓球面波調(diào)制信號(hào)自適應(yīng)峰均比抑制方法

doi: 10.11999/JEIT160139 cstr: 32379.14.JEIT160139

基金項(xiàng)目:

國家自然科學(xué)基金(60772056)，山東省泰山學(xué)者建設(shè)工程專項(xiàng)經(jīng)費(fèi)基金 (ts20081130)

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出版歷程
- 收稿日期: 2016-01-29
- 修回日期: 2016-06-29
- 刊出日期: 2017-01-19

Adaptive Peak-to-average Power Ratio Reduction Method for ProlateSpheroidal Wave Function Orthogonal Modulation Signal

Funds:

The National Natural Science Foundation of China (60772056), The Taishan Scholar Special Construction Funds Funded Project of Shandong Province (ts20081130)

摘要

摘要: 該文針對橢圓球面波(Prolate Spheroidal Wave Function, PSWF)時(shí)域正交調(diào)制信號(hào)峰均功率比過高，易受功率放大器非線性影響，造成信號(hào)失真，導(dǎo)致系統(tǒng)解調(diào)性能下降的問題，提出一種基于律壓縮的自適應(yīng)峰均比抑制方法。該方法能夠根據(jù)輸入信號(hào)自適應(yīng)調(diào)節(jié)壓縮參數(shù)，有效壓縮信號(hào)峰值，降低PSWF調(diào)制信號(hào)峰均功率比(Peak-to-Average Power Ratio, PAPR)，同時(shí)保證壓縮前后信號(hào)平均功率不變。理論論證和仿真結(jié)果表明，該方法能夠有效抑制PSWF調(diào)制信號(hào)PAPR，當(dāng)壓縮參數(shù)為1且互補(bǔ)累計(jì)分布函數(shù)CCDF為10-4時(shí)，壓縮后調(diào)制信號(hào)與原調(diào)制信號(hào)相比PAPR降低約2.1 dB；有效改善經(jīng)過功放后調(diào)制信號(hào)功率譜和系統(tǒng)在高斯白噪聲信道下的誤碼性能。
- 橢圓球面波 /
- 峰均功率比 /
- 壓擴(kuò)算法 /
- 輸入功率回退
Abstract: A new companding transform based on-law companding schemes is proposed for the reduction of Peak-to-Average Power Ratio (PAPR) of Prolate Spheroidal Wave Function (PSWF) orthogonal modulation signal, which causes serious degradation in performance when a nonlinear Power Amplifier (PA) is used. According to the input signal, the method adjusts the compression parameters automatically, which can guarantee the average signal power constant before and after compression, compression signal peak. Both the mathematical deduction and simulation results show that the proposed method can effectively reduce PAPR of PSWF orthogonal modulation signal, and effectively improve the power spectrum density of the signal and the BER performance of system under AWGN channel. The PAPR of compressed modulation signal decrease about 2.1 dB in comparison to the original modulation signal, when the parameter=1 and Complementary Cumulative Distribution Function CCDF=10-4.
- Prolate Spheroidal Wave Function (PSWF) /
- Peak-to-Average Power Ratio (PAPR) /
- Companding transform /
- Input back off

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參考文獻(xiàn)(20)

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