scholarly journals 60GHz Reverse Modulation Fiber-Wireless System with Two Jointed DSP Algorithms

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Long Chen ◽  
Ziwei He ◽  
Lv Zhao ◽  
Bin Zhong
Keyword(s):  
Forward Error Correction ◽  
Average Power ◽  
Power Ratio ◽  
Soft Decision ◽  
Transmission Performance ◽  
Wireless System ◽  
Ofdm Signal ◽  
Channel Frequency Response ◽  
Forward Error ◽  
First Time

In this paper, we propose a reverse modulation fiber-wireless system with two jointed DSP algorithms. The signal in the system is OFDM modulated millimeter wave (mm-wave) at 60GHz. In order to improve transmission of this system, the discrete Fourier transform spread (DFT-Spread) technology and the averaging of the channel frequency response (H-averaging) technology are applied. The DFT-Spread technology helps to reduce the peak-to-average power ratio (PAPR) of the OFDM signal, and the H-averaging technology helps to optimize channel estimation. This is the first time that the two kinds of technology were used together in this reverse modulation system. According to the simulation, the 22Gbit/s 16QAM-OFDM at 60GHz can be generated and transmitted for 90km fiber transmission under the soft decision forward error correction (SD-FEC) threshold 3.8×10-3. The results show that the two jointed DSP algorithms can improve the reverse modulation system transmission performance obviously.

Soft-Decision-Based Forward Error Correction for 100 Gb/s Transport Systems

2010 ◽  
Vol 16 (5) ◽  
pp. 1258-1267 ◽  
Author(s):  
Kiyoshi Onohara ◽  
Takashi Sugihara ◽  
Yoshiaki Konishi ◽  
Yoshikuni Miyata ◽  
Tomoka Inoue ◽  
...  
Keyword(s):  
Error Correction ◽  
Forward Error Correction ◽  
Transport Systems ◽  
Soft Decision ◽  
Forward Error

scholarly journals Transform Methods for the Reduction of the Peak to Average Power Ratio for the OFDM Signal

2017 ◽  
Vol 2017 ◽  
pp. 1-17
Author(s):  
Rajendra Kumar ◽  
Vuttipol Santitewagul
Keyword(s):  
Average Power ◽  
Bandwidth Efficiency ◽  
Power Ratio ◽  
Ofdm System ◽  
Single Carrier ◽  
Ofdm Signal ◽  
Qam Modulation ◽  
Computational Requirement ◽  
Power Ratio Reduction ◽  
Ratio Reduction

The paper presents multitransform OFDM-OP system for an effective PAPR (peak to average power ratio) reduction that has a reasonable computational requirement, does not introduce any distortion, needs relatively insignificant decrease in the bandwidth efficiency, and provides a PAPR very close to that for the single carrier modulation systems thus effectively eliminating any PAPR penalty incurred by the multicarrier OFDM system. The PAPR system consists of a bank of multiple orthonormal transforms and a minimum PAPR evaluation unit for finding the optimum transform index. The paper also presents a hybrid OFDM-OP-DSI system comprised of the multiple transforms and a novel dummy symbol insertion. The PAPR reduction performance of the presented systems is compared with those of the various other transform techniques of the literature. Various simulations on the presented systems show that these can achieve a PAPR that is very close to that of a single carrier system for QAM modulation with the order of modulation selected to be 16, 64, and 256.

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