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UEP CodesBased Cooperative Network With Different User Priorities Approach and Their Analysis

Mohammadkhani Razlighi, Mohsen | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43702 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri-kenari, Masoumeh; Behroozi, Hamid
  7. Abstract:
  8. In recent years, coded cooperation has been considered as one of the best methods to cope with fading and at the same time to achieve channel coding gain. There is a special case of cooperative networks that provide different level of user priority. Among all methods for creating user priority our motivation is to use of UEP codes for this propose. UEP codes are a special case of channel codes that provide different level of protection for message. It means that some part of message that has more protection it has less error. First we review all type of UEP codes and compare them in term of probability of bit error on the AWGN channel. And best code will be choosing for applying to this work. Hereafter the cooperative structure for a multiple access channel with two users with different priorities and a common destination described.Where the inter user channel is ideal for this model.This idea based on fact that users have their message information in second transmission and they can use joint coding for their messages and user with higher priority encode their messages in high protection part of UEP codes . With this method not only we gain all Improvement that cause by cooperation also we have different level of protection for our users. We have outage probability and throughput analysis for these methods. It is shown that the proposed method can well establish priorities among network users to provide high quality of service for high priority users.In the end of the first part numerical result and simulation are presented.In second part a general case was considered. Inter user channel modeled with a nakagami fading model and previous protocol applied in new model and its weakness recognized. Then a new protocol declared to have performance and priority on the new model. In the end of second part we have outage probability and throughput analysis for this new protocol and it is shown that the new proposed method can well establish priorities among network users too and it provides high quality of service for high priority users as well as old protocol on the first model
  9. Keywords:
  10. Outage Probability ; Throughput ; Cooperative Network ; Cooperative Diversity ; Media Access Control (MAC)Layer ; Unequal Error Protection (UEP)Codes

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