路明丽,于宏毅,仵国锋.可见光通信单极性非对称限幅光OFDM技术研究[J].光电子激光,2017,28(9):972~977 |
可见光通信单极性非对称限幅光OFDM技术研究 |
Research on unipolar asymmetrically clipped optical OFDM technique in visible li ght communication |
投稿时间:2017-01-16 |
DOI: |
中文关键词: 可见光通信(VLC) 单极性正交频分复用(U-OFDM) 非对称限幅光OFDM(ACO-OFDM) 误 比特率(BER) 峰均比(PAPR) |
英文关键词:visible light communication (VLC) unipolar orthogonal frequency division multip lexing (U-OFDM) asymmetrically clipped optical OFDM (ACO-OFDM) bit error rat io (BER) peak-to-average power ratio (PAP R) |
基金项目:国家自然科学基金(61671477)和广东省重大科技专项(2016B010111001)资助项目 (解放军信息工程大学,河南 郑州 450001) |
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中文摘要: |
为了提升非对称限幅光正交频分复用(ACO-OFDM )的频谱效率,提出了一种单极性非对称限幅 光OFDM(UACO-OFDM)调制技术。UACO-OFDM是由ACO-OFDM和单极性OFDM(U-OFDM)两种 光OFDM信号组成,不同长度的信号在发送端按照一定规则进行叠加。然后通过发光二极管(LED)进行 传输,在接收端只用1个光电检测器(PD)接收光信号,采用干扰消除方法依次对不同信号 进行解调。当 调制阶数相同时,UACO-OFDM的频谱效率要高于ACO-OFDM。在频谱效率相等的情况下,对 UACO-OFDM和其他传统光OFDM调制方式的误比特率(BER)和峰均比(PAPR) 性能进行对比分析。 仿真结果表明,UACO-OFDM的BER性能更优。与频 谱能量有效OFDM(SEE-OFDM)相比,当子载波 数为64时,两者的PAPR性能比较接近;当子载波数为256024时,UACO-OFDM比SEE-OFDM的PAPR分别低2dB和5dB以上。 |
英文摘要: |
In order to improve the spectral effic iency of asymmetrically clipped optical orthogonal frequency division multiplexi ng (ACO-OFDM),a unipolar asymmetrically clipped optical OFDM (UACO-OFDM) modulation scheme is proposed in this paper.The UACO-OFDM signal is composed of the ACO-OFDM and unipolar OFDM (U-OFDM) signals,and the signals with di fferent lengths are superposed according to the certain rules.Therefore,the superposed signal is tr ansmitted through the light emitting diodes (LEDs) at the transmitter,and only one photodiode (P D) receives the light signal at the receiver.The interference cancellation method is employed t o demodulate different signals successively at the receiver.When the modulation orders of eve ry system are the same, the spectral efficiency of UACO-OFDM is higher than that of ACO-OFDM.The bit error ratio (BER) and peak-to-average power ratio (PAPR) performance of UACO-OFDM and other traditional optical OFDM modulation schemes are compared and analyzed under the same spectral effici ency. The simulation results show that the BER performance of UACO-DFDM is better than those of other techniques.Compared with spectral and energy efficient OFDM (SEE-OFDM),when the subcarrier number is 64,the PAPR performances are very similar.But when the subcarrier numbers are 256and 1024, PAPR values of the UACO-OFDM are at least 2dB and 5dB bett er than that of SEE-OFDM,respectively. |
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