Performance Enhancement of OFDM System in Indoor Wireless Channels Using Loading Algorithm

2009 ◽  
Author(s):  
Ahmed J. Jameel ◽  
Hadeel Adnan ◽  
Abir J. Hussain ◽  
Bi Guangguo
Keyword(s):  
Wireless Channels ◽  
Performance Enhancement ◽  
Ofdm System ◽  
Indoor Wireless

scholarly journals Performance Enhancement of Coherent Optical OFDM System Using LMS Algorithm

2020 ◽  
Vol 1 ◽  
pp. 1-5
Author(s):  
Manisha Bharti
Keyword(s):  
Phase Noise ◽  
Bit Error Rate ◽  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Performance Enhancement ◽  
Lms Algorithm ◽  
Frame Structure ◽  
Least Mean Square ◽  
Ofdm Systems ◽  
Ofdm System

Instability of the local oscillator causes phase noise – a phenomenon that is a disadvantage and is considered to be a major obstacle in the functioning of coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. An attempt has been made in this paper to reduce the effects of common phase errors generated by phase noise. In this paper, a least mean square (LMS) based algorithm is proposed for estimation of phase noise. Using this proposed algorithm, the major problem of phase ambiguity caused by cycle slip is avoided and the bit error rate is greatly improved. Further, there is no requirement for modifying the frame structure of OFDM using this algorithm. A CO-OFDM system with the 8-PSK technique is used to implement the algorithm concerned. Furthermore, the algorithm, using the 8-PSK modulation technique, is analyzed and compared with the existing QPSK technique and with other algorithms. The investigations reveal that 8-PSK outperforms existing LMS algorithms using other techniques and significantly reduces the bit error rate.

Robust MIMO-OFDM System for Frequency-Selective Mobile Wireless Channels

2015 ◽  
Vol 64 (5) ◽  
pp. 1739-1749 ◽  
Author(s):  
Arafat Al-Dweik ◽  
Fatma Kalbat ◽  
Sami Muhaidat ◽  
Oscar Filio ◽  
Shirook M. Ali
Keyword(s):  
Wireless Channels ◽  
Ofdm System ◽  
Mobile Wireless ◽  
Mimo Ofdm ◽  
Frequency Selective
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