可見光多維無載波幅度相位調(diào)制系統(tǒng)

王旭東; 崔玉; 吳楠

doi:10.11999/JEIT170276

可見光多維無載波幅度相位調(diào)制系統(tǒng)

doi: 10.11999/JEIT170276

基金項(xiàng)目:

國家自然科學(xué)基金(61371091)

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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-03-31
- 修回日期: 2017-09-11
- 刊出日期: 2017-12-19

Multi-dimensional Carrierless Amplitude and Phase Modulation for Visible Light Communication System

Funds:

The National Natural Science Foundation of China (61371091)

摘要

摘要: 針對(duì)室內(nèi)可見光通信調(diào)制技術(shù)和多用戶接入問題，該文基于直流偏置和極性編碼信號(hào)單極化思想提出兩種系統(tǒng)復(fù)雜度低、頻帶利用率高的可見光多維無載波幅度相位(DCO-MCAP, U-MCAP)調(diào)制方案。首先利用最大最小優(yōu)化算法構(gòu)建無頻譜泄漏的頻域目標(biāo)方程，采用完全重建(PR)條件作為非線性約束方程，求取時(shí)域正交的多維CAP濾波器組，然后分別采用添加直流偏置和零值位置極性編碼實(shí)現(xiàn)信號(hào)單極性，以滿足可見光通信強(qiáng)度調(diào)制/直接檢測的要求。基于朗伯輻射模型，可見光背景噪聲建模為加性高斯白噪聲(AWGN)，推導(dǎo)了DCO- CAP/MCAP, U-CAP/MCAP 4種調(diào)制方案的誤符號(hào)率理論解，仿真驗(yàn)證了其準(zhǔn)確性。在5 m5 m3 m的室內(nèi)場景下，仿真對(duì)比分析了2維、3維、4維可見光CAP調(diào)制系統(tǒng)的頻帶利用率、誤碼率等性能。結(jié)果表明，相同星座尺寸時(shí)，多維CAP調(diào)制的誤碼性能明顯優(yōu)于傳統(tǒng)2維；相同頻帶利用率時(shí)，3種維度系統(tǒng)誤碼性能相近，可見光多維CAP調(diào)制為多用戶接入提供可能性。此外，討論了信道參數(shù)對(duì)可見光CAP系統(tǒng)的影響，發(fā)射機(jī)輻射角與收發(fā)信機(jī)之間距離都與信噪比損失呈現(xiàn)出正相關(guān)性。
- 可見光通信 /
- 多維無載波幅度相位調(diào)制 /
- 完全重建 /
- 頻帶利用率 /
- 誤符號(hào)速率
Abstract: Considering the modulation technique and multiple-access topology for indoor Visible Light Communication (VLC), two Multi-dimensional Carrierless Amplitude and Phase (Multi-CAP) modulation schemes are proposed in this paper, namely, DC biased Optical Multi-CAP (DCO-MCAP) and Unipolar optical Multi-CAP (U-MCAP). The design object is modeled as a mini-max optimization problem with a non-constraint condition named Perfect Reconstruction (PR), which can be solved by the quadratic programming algorithm. Only real and unipolar signals can be intensity modulated, therefore several modifications are performed in CAP VLC systems accordingly. A DC bias added to the signal and a pair of new samples including a zero padding to mark signal polarity are adopted to obtain unipolar signal respectively. According to Lambertian reflection model and considering light of sight link corrupted by Additive White Gaussian Noise (AWGN), the theoretical Symbol Error Rate (SER) of DCO-CAP/MCAP and U-CAP/MCAP are derived and corroborated by Monte Carlo simulations. Meanwhile, the performance of three kinds of dimensional (2D, 3D, 4D) optical CAP systems are analyzed and compared in the room in size of 5 m5 m3 m. The numerical results show that the error performance of optical Multi-CAP is superior to that of traditional two dimensional optical CAP with the same constellation, and the multi-CAP (3D or 4D) scheme can not only achieve approximate SER performance with respect to the same bandwidth efficiency, but also enable multiple access in VLC system. In addition, the effects of channel parameters on the system performance are evaluated which shows that the loss of SNR obviously presents positive relation with the increase of the radiation angle or the distance between the transmitter and the receiver.
- Visible Light Communication (VLC) /
- Multi-dimensional Carrierless Amplitude and Phase (Multi-CAP) modulation /
- Perfect Reconstruction (PR) /
- Bandwidth efficiency /
- Symbol Error Rate (SER)

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參考文獻(xiàn)(22)

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