scholarly journals Comparative Study of Bit Error Rate with Channel Estimation in OFDM System for M-ary Different Modulation Techniques

2014 ◽  
Vol 95 (8) ◽  
pp. 46-50
Author(s):  
Brijesh KumarPatel ◽  
Jatin Agarwal
Keyword(s):  
Channel Estimation ◽  
Comparative Study ◽  
Bit Error Rate ◽  
Error Rate ◽  
Ofdm System ◽  
Modulation Techniques

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.

scholarly journals A Generalized Bit Error Rate Evaluation for Index Modulation Based OFDM System

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 70082-70094 ◽  
Author(s):  
Mahmoud Abdullahi ◽  
Aijun Cao ◽  
Adnan Zafar ◽  
Pei Xiao ◽  
Ibrahim A. Hemadeh
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Ofdm System ◽  
Rate Evaluation ◽  
Index Modulation
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