A novel IQ imbalance and channel estimation algorithm for Alamouti OFDM systems

2013 ◽  
Author(s):  
Mohamed Marey ◽  
Moataz Shoukry Samir ◽  
Mohamed Hossam Ahmed ◽  
Hamed El-Shenawy ◽  
Adel Elhennawy
Keyword(s):  
Channel Estimation ◽  
Estimation Algorithm ◽  
Ofdm Systems ◽  
Iq Imbalance

A Sparsity Enhanced Channel Estimation Algorithm Based on Compressed Sensing in MIMO-OFDM Systems

2014 ◽  
Vol 35 (3) ◽  
pp. 665-670 ◽  
Author(s):  
Zhi-bin Xie ◽  
Tong-si Xue ◽  
Yu-bo Tian ◽  
Wei-chen Zou ◽  
Qing-hua Liu ◽  
...  
Keyword(s):  
Channel Estimation ◽  
Compressed Sensing ◽  
Estimation Algorithm ◽  
Ofdm Systems ◽  
Mimo 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.

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