Transmission and reception of Quad-Carrier QPSK-OFDM signal with blind equalization and overhead-free operation

Abstract

. (2013). Transmission and reception of quad-carrier QPSK-OFDM signal with blind equalization and overhead-free operation. Optics Express, 21(25), 30999-31005. DOI: 10.1364/OE.21.030999 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Lingle, and B. Zhu, "64-Tb/s, 8 b/s/Hz, PDM-36QAM transmission over 320 km using both pre-and posttransmission digital signal processing," J.

Transmission and reception of PDM dual-subcarrier coherent 16QAM-OFDM signals

“…Frequency domain equalization (FDE) is simple and effective, but it needs overheads (TSs and pilot tones) during equalization which leads to the SE degradation. Few subcarriers OFDM (dual-subcarrier and quad-subcarrier) transmission and reception was proposed in our previous work [10,11] to avoid overhead during equalization. Compared to conventional OFDM with a large number of subcarriers, an unbeatable advantage of OFDM with a small number of subcarriers is that the peak-toaverage power ratio (PAPR) is quite low [10][11][12][13].…”

“…Second, the SE is significantly reduced as the pilot tones should be inserted in every OFDM symbol with few subcarriers. Fortunately, we found that the Quadrature Phase Shift Keyed (QPSK) OFDM signal with dual-subcarrier and quad-subcarrier are 9QAM [10] and 25QAM [11] in the time domain, respectively. With these special properties, QPSK-OFDM signal with dual-subcarrier and quad-subcarrier can be equalized in the time domain with cascaded multimodulus algorithm (CMMA) equalization method.…”