Handover Performance Analysis in Mobile Systems with Adaptive Modulation and Coding

2010 ◽  
Author(s):  
Adriana Kalaydzhieva ◽  
Boris Tsankov
Keyword(s):  
Performance Analysis ◽  
Adaptive Modulation ◽  
Mobile Systems ◽  
Adaptive Modulation And Coding ◽  
Handover Performance

scholarly journals A New Wireless Generation Technology for Video Streaming

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Sarmad K. Ibrahim ◽  
Nasser N. Khamiss
Keyword(s):  
Video Coding ◽  
Video Streaming ◽  
High Efficiency ◽  
Data Transfer ◽  
Adaptive Modulation ◽  
Video Data ◽  
Mobile Systems ◽  
Adaptive Modulation And Coding ◽  
Generation Model ◽  
High Efficiency Video Coding

With the exponential rise in the volumes of video traffic in cellular networks, there is an urgent need for improving the quality of video delivery. This research proposes a mobile generation model based on the updated technologies of the fourth- and fifth-generation mobile systems, which is called Proposed Generation (Pro-G). This model uses wider bandwidth and advanced adaptive modulation and coding. It also incorporates the method of the adaptive video streaming of multiple video data rates by using the transcoding technique, which is called H.265 proposed (H.265 pro). Thus, both methods are tested to provide a large number of users of video/data application with more speed and best quality. A comparison with 4G technology is done to assign the development regarding number of users with data rate. The suggested video coding shows how much the overall system is more reliable over the congested channel than conventional video coding technologies such as high-efficiency video coding (HEVC/H.265) and advanced video coding (AVC/H.264). The results showed that the proposed method of transmitting wireless data is better than the LTE-ADV method. In this method, the rate of data transfer increases by 29% compared with LTE-ADV, while the bit rate saving was increased to 13% in the proposed video coding compared with that in the H.265.

scholarly journals Performance Analysis of MRC Receivers with Adaptive Modulation and Coding in Rayleigh Fading Correlated Channels with Imperfect CSIT

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Ramiro Sámano-Robles ◽  
Egons Lavendelis ◽  
Eduardo Tovar
Keyword(s):  
Performance Analysis ◽  
Rayleigh Fading ◽  
Signal To Noise Ratio ◽  
Adaptive Modulation ◽  
Adaptive Modulation And Coding ◽  
Common Belief ◽  
Spatially Correlated ◽  
Maximum Ratio Combining ◽  
Correlated Channels ◽  
Trigger Decision

This paper addresses the performance analysis of an adaptive wireless link with one antenna transmitter and a multiple antenna maximum-ratio combining (MRC) receiver. Two main assumptions are used in this paper: (1) Rayleigh fading correlated channels (i.e., MRC branch correlation) and (2) imperfect (outdated) channel state information at the transmitter (CSIT) side. The main contribution of this work lies in the derivation of analytic expressions (in terms of a series expansion) of the statistics of correct packet reception conditional on the decisions made by the transmitter based on outdated CSIT. The novelty of this derivation is the joint modelling of spatially correlated branches, imperfect CSIT, and adaptive modulation based on threshold-trigger decision. Contrary to common belief, the results presented here suggest that spatial correlation not always affects the performance of the MRC receiver: at low signal-to-noise ratio (SNR), correlation can improve performance rather than degrading it. In contrast, at high SNR, correlation is found to always degrade performance. At high SNR, correlation tends to worse the degrading effects of imperfect CSIT, particularly when the number of antennas increases. Imperfect CSIT causes errors in the assignment of MCSs, thus reducing throughput performance. These errors become more evident in the high SNR regime, particularly when the values of branch correlation and the number of antennas increase.

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