scholarly journals A Simplified Model of Bit Error Rate Calculation

2015 ◽  
Vol 9 (1) ◽  
pp. 41
Author(s):  
Saed Ali Thuneibat ◽  
Huthaifa Al_Issa ◽  
Abdallah Ijjeh
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Communication Systems ◽  
Digital Communication ◽  
Computing Time ◽  
Proposed Model ◽  
Rate Calculation ◽  
Digital Communication Systems ◽  
Key Parameter

<p>The Bit Error Rate (BER) is a key parameter of the Quality of Service (QoS) for engineers and designers of digital communication systems and networks. At the present  time, a set of models and methods are exist for calculating the BER. But these methods are complex and require large computing cost.</p><p>In this paper, we provide a new model for calculating the BER. This model simplifies the procedures in the existing models and reduces the computing time. In the same time, the proposed model save the accuracy and the state consideration of existing models.</p>

scholarly journals Bit Error Rate Performance of Spread Spectrum Communication Systems for AWGN Channels

2020 ◽  
Vol 9 (3) ◽  
pp. 277-280
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Spread Spectrum ◽  
Communication Systems ◽  
Digital Communication ◽  
Additive White Gaussian Noise ◽  
Direct Sequence Spread Spectrum ◽  
Rate Performance ◽  
Direct Sequence ◽  
Spread Spectrum Systems

The digital communication technologies have gained immense significance as it provides secure and error free services. One of the major advantages of digital communication is that they are much resistant to transmitted as well as interpreted errors. For ensuring the security of data, the most suitable method is to use spread spectrum technique. The spread spectrum technique has gained immense popularity for use in various systems as the spreading of the spectral bandwidth offer many advantages, including the establishment of secure communications, increasing resistance to interference, noise rejection, and so on. The signals which are modulated by using these techniques cannot be jammed and are very hard to interfere. This paper presents the results of investigation of BPSK based direct sequence spread spectrum systems for Additive White Gaussian Noise (AWGN) and undersea channels. The bit error rate performance of BPSK based direct sequence spread spectrum systems has been simulated for the AWGN channel and the results have been plotted.

scholarly journals The analysis of truncated ARQ and HARQ schemes using transition diagrams

2020 ◽  
Vol 12 (2) ◽  
pp. 35-51
Author(s):  
Herald N. Kundaeli
Keyword(s):  
Real Time ◽  
Communication Systems ◽  
Digital Communication ◽  
New Method ◽  
Quality Of Information ◽  
Transmission Of Information ◽  
Digital Communication Systems ◽  
Efficient Transmission

In digital communication systems, ARQ and HARQ schemes are employed in order to ensure efficient transmission of information and utilisation of the channel by retransmitting information that has not being received correctly at the receiver. In some applications, however, such as real-time services, the quality of information is degraded if too many retransmission trials are employed for each unit of erroneously received information. The  retransmissions are therefore limited leading to truncated ARQ and HARQ schemes. In this study we develop a new method for deriving the  expressions for the throughput efficiencies of truncated ARQ and HARQ schemes and investigate how the efficiencies vary with the number of allowed retransmissions. Keywords: ARQ, HARQ, Throughput Efficiency, Truncated ARQ.

Picture Quality Judgments in a Digital Television System

1974 ◽  
Vol 16 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Stanley M. Soliday ◽  
James A. Gardner
Keyword(s):  
Response Surface ◽  
Communication Systems ◽  
Digital Communication ◽  
Sampling Frequency ◽  
Digital Television ◽  
Code Length ◽  
Picture Quality ◽  
Television System ◽  
Digital Communication Systems

Digital communication systems distort their signals as a consequence of the digitization process. The distortions are related to the code length and sampling frequency of the system. The present study assessed viewers' responses to these variables by using simulated digital television. To do this, 24 subjects rated the quality of pictures distorted by several combinations of the variables. A response surface generated from the ratings showed that the ratings were affected by both variables, but most profoundly by code length. Interpretation of the surface's contours from the perspective of system costs revealed that costs should be considered solely from the standpoint of code length.

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