A Channel Model for the Bit Error Rate Process in 802.15.4 LR-WPAN Wireless Channels

2008 ◽  
Author(s):  
M. U. Ilyas ◽  
H. Radha
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Wireless Channels ◽  
Channel Model ◽  
Rate Process

Improved bit error rate estimation over experimental optical wireless channels

2009 ◽  
Author(s):  
Mamdouh El Tabach ◽  
Samir Saoudi ◽  
Patrick Tortelier ◽  
Olivier Bouchet ◽  
Ramesh Pyndiah
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Wireless Channels ◽  
Optical Wireless ◽  
Rate Estimation

Bit-Error-Rate Evaluation of High-Efficiency Differential-Chaos-Shift-Keying System Over Wireless Channels

2017 ◽  
Vol 27 (01) ◽  
pp. 1850008 ◽  
Author(s):  
Nguyen Xuan Quyen
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Wireless Channels ◽  
High Efficiency ◽  
Wireless Channel ◽  
Delay Spread ◽  
Shift Keying ◽  
Chaos Shift Keying ◽  
Differential Chaos Shift Keying ◽  
Ber Performance

A high-efficiency differential-chaos-shift-keying (HE-DCSK) system has been proposed previously for the improvement of both bit-rate and bit-error-rate (BER) performance in comparison with the conventional DCSK system. This improvement made HE-DCSK be a promising solution for chaos-based communications. However, the performance of this system was just investigated under an additive white Gaussian noise (AWGN) channel. This is main motivation for our work to evaluate the performance of HE-DCSK over a typical wireless channel which is simultaneously affected by white noise, fading, multipath, and delay spread. The operation of the transmitter and receiver over the wireless channel is modeled and described. The BER performance is evaluated by theoretical analysis using Gaussian approximation and discrete integration. The numerical results obtained by Monte Carlo simulations are presented to verify the analyzed performance. Obtained results point out that the HE-DCSK system not only performs better than other DCSK-based ones under wireless channels but also can exploit the multipath characteristic to improve the performance.

scholarly journals Bit Error Rate Analysis of Different Modulation Schemes in Free Space Optics Link using Gamma-Gamma Turbulence Model

2019 ◽  
Vol 8 (4) ◽  
pp. 8292-8295
Keyword(s):  
Phase Shift ◽  
Gamma Distribution ◽  
Bit Error Rate ◽  
Error Rate ◽  
Free Space ◽  
Channel Model ◽  
Distribution Model ◽  
Phase Shift Keying ◽  
Free Space Optical ◽  
Shift Keying

Free Space Optical (FSO) link using gamma-gamma channel model has been studied in this paper. Comparison of the probability density function of gamma-gamma distribution under weak and strong turbulence regime has been performed. Performance of Bit error rate (BER) using different subcarrier-intensity modulation (SIM) schemes such as binary phase shift keying (BPSK), M-ary phase shift keying (M-PSK) and quadrature amplitude modulation (QAM) have been also investigated. Using MATLAB software, the BER is plotted with respect to normalized signal to noise ratio (SNR) and the link distance. All the analysis has been done using the Gamma-Gamma distribution model. In this work we found that the effectiveness of each modulation technique depends on the environment.

scholarly journals Modeling and Performance Optimization of Unmanned Aerial Vehicle Channels in Urban Emergency Management

2021 ◽  
Vol 10 (7) ◽  
pp. 478
Author(s):  
Bing Han ◽  
Danyang Qin ◽  
Ping Zheng ◽  
Lin Ma ◽  
Merhawit Berhane Teklu
Keyword(s):  
Emergency Management ◽  
Bit Error Rate ◽  
Error Rate ◽  
Performance Optimization ◽  
Information Exchange ◽  
Channel Model ◽  
Single Channel ◽  
Smart Cities ◽  
Small Scale ◽  
Low Altitude

With the development of smart cities, the use of unmanned aerial vehicles (UAVs) for interactive information exchange between air and ground can provide effective support for the deployment of emergency work. However, the existing UAV air-to-ground channels often use a single channel model. Considering that the density and distribution of obstructions on information transmission paths at different heights are different, only using a single channel model greatly affects the reliability of communications. Aiming at addressing the different channel characteristics of air-to-ground channels at different heights, a height-based adaptive SUUL-SULA channel model is proposed in this paper. Firstly, in the ultra-low altitude environment, the influence of large-scale fading and small-scale fading on the envelope of the received signal is discussed based on the classic LOO model, and the probability density function and bit error rate model of the received signal are derived. Secondly, a SULA channel model based on Jakes’ model is proposed in the low-altitude environment. The uniform circular array beamforming technology is adopted to realize the design of the Doppler frequency shift compensation algorithm. Finally, the simulation results show that the SUUL-SULA model effectively reduces the bit error rate of the system and improves the reliability of communication. Therefore, this model can provide effective physical support for the application of UAV in smart city emergency management.

scholarly journals A Time-Varying Filter for Doppler Compensation Applied to Underwater Acoustic OFDM

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 105 ◽  
Author(s):  
Habib Roudsari Mirhedayati ◽  
Jean-François Bousquet
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Doppler Effect ◽  
Orthogonal Frequency Division Multiplexing ◽  
Channel Model ◽  
Time Varying ◽  
Ofdm Symbol ◽  
Low Snr ◽  
Time Scaling ◽  
Doppler Compensation

This paper describes a Doppler compensation algorithm to improve the reliability of orthogonal frequency division multiplexing (OFDM). To compensate for the time-varying Doppler effect in a mobile deployment scenario, first the time-scaling factor over a wideband channel is estimated using pilot tones inserted in each OFDM symbol. Then, using a time-varying resampling technique, the Doppler effect is compensated during the reception of each OFDM symbol in the frame. To predict the performance of the system in relatively shallow waters, a software channel model is developed that is able to simulate a wide variety of dynamic shallow water deployment scenario. The performance of the algorithm was tested for two extreme frequency ranges during sea trials, the first at 2 kHz for a long-range application, and the second at 125 kHz for a short range telemetry link. For the 2-kHz system, a 16-bps mobile link in which the platform was moving at 1 m/s was demonstrated to have a bit error rate on the order of 10 − 3 , while, for the 125-kHz telemetry application, a 2000-bps link was enabled with a bit error rate of 0.03 at a low SNR equal to 5.5 dB.

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