Abstract
Problem statement: Higher data transmission rate with Quality of Serv ices (QoS) guarantee is an important objective for wireless br oadband communication systems. Unlike other communication system, real-time transmission requir es high data rate and good error performance to ensure good quality of service. This study descr ibes the design problem of real-time wireless data transmission which provides higher achievable data rate with Unequal Error Protection (UEP). Approach: Real-time data stream was divided equally into two streams, High Priority (HP) and Low Priority (LP) streams depending on their requirements. We considered these two bit streams as being encoded separately by two adaptive encoders. Feedback of Channel State Information (CSI) was used in adaptive physical lay er channel for efficient use of the current available bandwidth by controlling the encoders. Hi gh code rate were used in both encoders when the channel is good while low code rate is otherwis e. The two coded data streams were superimposed together with two different adjustable levels of power to achieve the UEP at the receiver end. Results: In this proposed scheme, same design metrics, name ly, time, bandwidth and power were used to increase the transmission effici ency. Conclusion/Recommendations: Results showed that our scheme provided higher error perfor mance for HP stream compared with other schemes that transmit using one power level data st ream. The finding can be modified for studying the effects of fading on this system in fu ture research.
Highlights
Transmitting higher data rate for error-sensitive applications over error prone wireless channels is the main challenge in future wireless broadband communication systems
This study has proposed a scheme for adaptive continuous real time transmission with two stages of different error protection levels
Adaptive encoders and superposition coding are employed for this purpose
Summary
Transmitting higher data rate for error-sensitive applications over error prone wireless channels is the main challenge in future wireless broadband communication systems. Based on the feedback of the CSI, suitable codes are selected to achieve higher data rate transmission with the required level of UEP. In the given proposed scheme, we have two different stages of UEP: Firstly, the two bit streams will be encoded separately by two identical adaptive encoders and to be unequally protected against channel noise. Performance of proposed scheme: Consider application data source producing data stream with high quality requirements to be transmitted through AWGN channel. It is obvious that the average performance is very close to 4-PAM modulation with 0.5 dB gain for the HP stream
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