scholarly journals Accurate and spectral efficient channel estimation using inter-block precoding and superimposed pilots in optical OFDM systems

2017 ◽  
Vol 25 (19) ◽  
pp. 22228 ◽  
Author(s):  
Changjian Guo ◽  
Yicheng Zheng ◽  
Han Zhang
Keyword(s):  
Channel Estimation ◽  
Ofdm Systems ◽  
Optical Ofdm

Chaotic-Sequence-Based Channel Estimation Algorithm for Secure Optical OFDM Systems

2014 ◽  
Vol 602-605 ◽  
pp. 3165-3168 ◽  
Author(s):  
Han Dong Wang ◽  
Li Qun Huang ◽  
Feng Yao
Keyword(s):  
Channel Estimation ◽  
Binary Sequence ◽  
Estimation Algorithm ◽  
Original Data ◽  
Chaotic Sequence ◽  
New Method ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Optical Ofdm ◽  
Very High

In this paper, in order to improve the security of optical OFDM system, we propose a new method to generate the pilot sequence of channel estimation using chaotic sequence. Firstly, we assign initial values to chaotic system, and calculate a chaotic sequence through an iteration method, then converting it into a binary sequence as the pilot of a DFT-based channel estimation algorithm. When the receiving end doesn’t know the chaotic-sequence-based pilot, the system will have very high BER, and can not restore the original data, which indicate that the new method provides a certain degree of security for optical OFDM systems without increasing the system complexity.

Channel Estimation and Symbol Detection with ICI Cancellation Based on Superimposed Training for OFDM Systems

2012 ◽  
Vol E95.B (9) ◽  
pp. 2926-2930
Author(s):  
Qinjuan ZHANG ◽  
Muqing WU ◽  
Qilin GUO ◽  
Rui ZHANG ◽  
Chao Yi ZHANG
Keyword(s):  
Channel Estimation ◽  
Ofdm Systems ◽  
Superimposed Training ◽  
Symbol Detection ◽  
Ici Cancellation
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