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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39592 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Nasiri Kenari, Masoumh
- Abstract:
- In recent years, Network Coding has received a great attention as an effective approach to increase the network throughput. Due to its promising advantages, in this thesis, we consider cooperative protocols based on Network Coding in two basic channels, namely MAC and MARC. We propose three cooperative transmission protocols for these channels along with their proper receivers at the destination node. The first one is for a typical two-user MAC, in which direct conventional network coding (i.e., XORing the packets of the users) is used. The proposed protocol requires the transmission of only one additional (repeated) packet for any arbitrary number of information packets transmitted by the users. We show that the protocol provides a second order of diversity for both of the transmitters without any increase in the number of antennas. A similar structure is proposed for a typical two-user MARC, which also achieves a second order of diversity without any increase in the total transmitted power compared to conventional MARC. Using distributed V-BLAST concept, we consider an analogue implementation of network coding for MARC, and then by using nulling detection method we propose an algorithm for detection in final destination node. We evaluate the performance of the proposed protocol analytically. Using the analytical results, we show that this scheme achieves full diversity order of two for both of the users. The analytical evaluations are then confirmed by simulation. It should be noticed that for performing analogue network coding in MARC, the relay node must consume more power for its cooperation. All of the proposed protocols can achieve the same diversity order of two for more than two users either in MAC or in MARC.
- Keywords:
- Network Coding ; Cooperative Diversity ; Multiple Access ; Multiple Access Relay Channel (MARC) ; Vertical-Bell Laboratories Layered Space Time (V-BLAST)
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