【摘要】：為了提升非對稱限幅光正交頻分復用(ACO-OFDM)的頻譜效率,提出了一種單極性非對稱限幅光OFDM(UACO-OFDM)調(diào)制技術。UACO-OFDM是由ACO-OFDM和單極性OFDM(UOFDM)兩種光OFDM信號組成,不同長度的信號在發(fā)送端按照一定規(guī)則進行疊加。然后通過發(fā)光二極管(LED)進行傳輸,在接收端只用1個光電檢測器(PD)接收光信號,采用干擾消除方法依次對不同信號進行解調(diào)。當調(diào)制階數(shù)相同時,UACO-OFDM的頻譜效率要高于ACO-OFDM。在頻譜效率相等的情況下,對UACO-OFDM和其他傳統(tǒng)光OFDM調(diào)制方式的誤比特率(BER)和峰均比(PAPR)性能進行對比分析。仿真結(jié)果表明,UACO-OFDM的BER性能更優(yōu)。與頻譜能量有效OFDM(SEE-OFDM)相比,當子載波數(shù)為64時,兩者的PAPR性能比較接近;當子載波數(shù)為256和1 024時,UACO-OFDM比SEE-OFDM的PAPR分別低2dB和5dB以上。
[Abstract]:In order to improve the spectral efficiency of asymmetric amplitude limiting optical orthogonal frequency division multiplexing (ACO-OFDM), a unipolar asymmetric limiting optical OFDM (UACO-OFDM) modulation technique is proposed. UACO-OFDM is composed of two kinds of optical OFDM signals, ACO-OFDM and unipolar OFDM (UOFDM). Signals of different lengths are superimposed in accordance with certain rules at the sending end. Then the light emitting diode (LED) is used to transmit the optical signal, and only one photodetector (PD) is used to receive the optical signal at the receiving end. The different signals are demodulated in turn by interference cancellation method. When the modulation order is the same, the spectral efficiency of UACO-OFDM is higher than that of ACO-OFDM.. Under the condition of equal spectral efficiency, the bit error rate (BER) and peak-to-average ratio (PAPR) performance of UACO-OFDM and other conventional optical OFDM modulation methods are compared and analyzed. The simulation results show that the BER performance of UACO-OFDM is better. Compared with the spectral energy efficient OFDM (SEE-OFDM), when the number of subcarriers is 64, the performance of PAPR is close, and when the number of subcarriers is 256 and 1,024, the UACO-OFDM is lower than the PAPR of SEE-OFDM, which is more than 2dB and 5dB, respectively.
【作者單位】： 解放軍信息工程大學;
【基金】：國家自然科學基金(61671477) 廣東省重大科技專項(2016B010111001)資助項目
【分類號】：TN929.1

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