Improving the performance of non-DC-biased optical OFDM with lazy lifting wavelet transform
[ X ]
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In recent years, the lifting wavelet transform (LWT) has been used in image and signal processing applications to overcome many of the shortcomings of the classical discrete wavelet transform (DWT). The LWT is a simplified and most efficient version of the classical discrete wavelet transform. To address the issue of energy inefficiency in the direct current-biased optical OFDM (DCO-OFDM) waveform, the literature proposes the use of the non-direct current-biased optical OFDM (NDC-O-OFDM) waveform, which does not require the addition of DC bias. Firstly, this paper proposes improving the performance of the NDC-O-OFDM waveform by combining it with the LWT using the lazy wavelet (LLWT). However, the literature proposes the use of the generalized LED index modulation OFDM (GLIM-OFDM) waveform as a solution to the spectrum inefficiency problem of the NDC-O-OFDM waveform. As a second contribution, this paper presents the combination of the GLIM-OFDM waveform with the LLWT transform to enhance the performance of the GLIM-OFDM waveform. Numerical simulations were performed to evaluate the performance of the proposed LLWT-NDC-O-OFDM and LLWT-GLIM-OFDM waveforms in terms of bit error rate (BER) in 2 x 2 and 4 x 4 optical MIMO channel environments. The results show that the proposed waveforms provide a gain of approximately 6.5 dB over both the NDC-O-OFDM and GLIM-OFDM waveforms, and a gain of 13.5 dB over the DCO-OFDM waveform, while maintaining the same BER requirement of 1E-4 and modulation order of BPSK in both 2 x 2 and 4 x 4 optical MIMO channel scenarios. Thus, despite some increase in computational complexity due to LWT implementation, a spectrum and energy efficient high performance optical OFDM waveform is achieved with the proposed LLWT transform in this work.
Açıklama
Anahtar Kelimeler
Optical OFDM, DCO-OFDM, NDC-O-OFDM, GLIM-OFDM, Lifting wavelet transform, Energy efficiency
Kaynak
Photonic Network Communications
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
47
Sayı
3
