Average BER performance of rectangular QAM-UWOC over strong oceanic turbulence channels with pointing error

2020 ◽  
Vol 476 ◽  
pp. 126362
Author(s):  
Yuqing Fu ◽  
Qi Duan ◽  
Chengti Huang ◽  
Yongzhao Du ◽  
Lin Zhou
Keyword(s):  
Pointing Error ◽  
Oceanic Turbulence ◽  
Average Ber ◽  
Ber Performance

Impact of Pointing Error on the BER Performance of an OFDM Optical Wireless Communication Link over Turbulent Condition

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Bobby Barua ◽  
S. P. Majumder
Keyword(s):  
Noise Analysis ◽  
Data Rate ◽  
Channel Noise ◽  
Communication Link ◽  
Optical Wireless ◽  
Power Penalty ◽  
Major Power ◽  
Pointing Error ◽  
Turbulent Condition ◽  
Ber Performance

AbstractAn analytical approach is developed in this paper to evaluate the bit error rate (BER) performance of an optical wireless (OW) communication system with multiplexing of the RF orthogonal frequency division (OFDM) over turbulent condition taking into account the effect of pointing error. The received signal is detected through direct detection receiver followed by RF synchronous demodulation including the effect of OW channel and different form of noises such as receiver thermal noise, background channel noise and photo detector shot noise. Analysis is developed for an OFDM system over the OW channel, taking into account the effect of pointing error between the transmitter and the receiver in turbulent condition and the analysis reveals that the OFDM OW system is less affected by pointing error with deference to the major power penalty at BER performance. For instance, power penalty at BER 10−9 is found to be 3 dB for 256 OFDM subcarriers with 9 millidegree displacement angle at a data rate of 10 Gbps under turbulent condition. It is found that the system is more influenced by the atmospheric turbulence at a higher data rate.

Effect of adverse weather conditions and pointing error on the performance of 2-D WH/TS OCDMA over FSO link

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Bithi Mitra ◽  
Md. Jahedul Islam
Keyword(s):  
Free Space ◽  
Atmospheric Condition ◽  
Optical Power ◽  
Weather Conditions ◽  
Free Space Optical ◽  
Central Wavelength ◽  
Pointing Error ◽  
Adverse Weather ◽  
Code Division Multiple ◽  
Ber Performance

AbstractIn this paper, the performance of two-dimensional (2-D) wavelength-hopping/time-spreading (WH/TS) optical code division multiple access (OCDMA) system over free space optical (FSO) channel is analyzed in the presence of pointing error and different weather conditions. Prime code scheme is employed for both wavelength-hopping and time-spreading to address user code-matrix. The operating central wavelength of 1550 nm is considered to demonstrate the bit error rate (BER) performance of the proposed system as a function of various system parameters. The required optical power of the proposed system is determined to maintain a BER value of 10−9. The numerical evaluation interprets that the BER performance is highly dependent on transmission length, transmitted power, pointing error angle as well as the number of simultaneous user. It is also observed that the 2-D OCDMA system over free space needs minimum required optical power in case of rainy atmospheric condition, but it is maximum for foggy atmospheric condition.

Signal to Leakage and Noise Ratio Based Beamforming and User Scheduling for TD-LTE-A Systems

2013 ◽  
Vol 760-762 ◽  
pp. 551-555
Author(s):  
Xuan Li Wu ◽  
Ming Xin Luo ◽  
Lun Kuan Sun ◽  
Nan Nan Fu
Keyword(s):  
User Scheduling ◽  
Sum Capacity ◽  
Scheduling Strategy ◽  
Channel Interference ◽  
Average Ber ◽  
Noise Ratio ◽  
Downlink Signal ◽  
Beamforming Algorithm ◽  
Maximum Minimum ◽  
Ber Performance

In TD-LTE-A downlink, signal to leakage and noise ratio (SLNR) based beamforming can eliminate the co-channel interference and noise for multi-user MIMO mode effectively and can be realized more easily than the traditional ideal SINR based algorithms. Moreover, user scheduling can be combined with the SLNR based beamforming algorithm to obtain a better performance. Hence, in this paper, SLNR based beamforming is firstly compared with traditional beamforming algorithms, and then, a suboptimal maximum minimum SLNR (MMSLNR) scheduling strategy is proposed to improve the average BER performance and sum capacity of TD-LTE-A system and decrease the scheduling complexity as well.

An Approximation of the Average BER Performance of Multi-Hop AF Relaying Systems with Fixed Gain

2009 ◽  
Vol E92-B (10) ◽  
pp. 3280-3284
Author(s):  
JunKyoung LEE ◽  
SeungHun JANG ◽  
JangHoon YANG ◽  
DongKu KIM
Keyword(s):  
Average Ber ◽  
Relaying Systems ◽  
Af Relaying ◽  
Ber Performance

Effect of Pointing Error on BER Performance of a Multi-wavelength OCDMA FSO System with SIK Dual Detector Receiver

2019 ◽  
Vol 40 (3) ◽  
pp. 247-253
Author(s):  
A. K. M. Nazrul Islam ◽  
S. P. Majumder
Keyword(s):  
Standard Deviation ◽  
Direct Detection ◽  
Code Length ◽  
Free Space Optical ◽  
Pointing Error ◽  
Multi Wavelength ◽  
Dual Detector ◽  
Multi Access ◽  
Code Division Multiple ◽  
Ber Performance

Abstract A novel analytical approach is presented to evaluate the bit error rate (BER) performance of a multi-wavelength optical code division multiple access (MW-OCDMA) free space optical (FSO) system using optical domain encoder and sequence inverse keying (SIK) balanced photodetector direct detection receiver taking the effect of pointing errors into considerations. The analysis is carried out to find the expression for the signal, multi-access interference (MAI) and crosstalk at the output of the SIK receiver in presence of pointing error. The BER performance results are evaluated for different values of standard deviation of pointing error, code length, number of simultaneous user and other system parameters. It is found that, MW-OCDMA system offers improved BER performance over single wavelength OCDMA FSO system. However, the performance of an MW-OCDMA system is degraded due to the effect of pointing error between the laser transmitter and optical receiver and the system suffers significant power penalty at a given BER of 10−9. The penalty is found to be 11.0 dB, 24.0 dB and 30 dB for jitter standard deviation of 1.3, 1.8 and 2.5 respectively when code length is 512 and number of user is 8 for number of wavelength 8. Further, the penalty can be greatly reduced by increasing the code length for a given number of user and number of wavelength.

scholarly journals Impact of angular pointing error on BER performance of underwater optical wireless links

2020 ◽  
Vol 28 (23) ◽  
pp. 34606
Author(s):  
Rubén Boluda-Ruiz ◽  
Antonio García-Zambrana ◽  
Beatriz Castillo-Vázquez ◽  
Steve Hranilovic
Keyword(s):  
Optical Wireless ◽  
Pointing Error ◽  
Wireless Links ◽  
Ber Performance
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