Global ETD Search

1	Achievable Rate and Capacity of Amplify-and-Forward Multi-Relay Networks with Channel State Information Tran, Tuyen X. 20 September 2013 (has links) No description available. Electrical Engineering Achievable rate channel state information distributed water filling ergodic capacity multiple relays non orthogonal amplify and forward power adaptation relay channel
2	Cooperative Communication Protocols : Diversity-Multiplexing Gain Tradeoff And Code Constructions Vinodh, K 07 1900 (has links) Cooperative relay communication is a promising means of wireless communication in which cooperation is used to create a virtual transmit array between the source and the destination, thereby providing spatial diversity for combating the fading channel. In this thesis we develop cooperative communication protocols namely the orthogonal amplify-and-forward (OAF), non-orthogonal and orthogonal selection decode-and-forward (NSDF and OSDF) protocols. The diversity-multiplexing gain tradeoff (DMT) of the three protocols is determined and DMT-optimal distributed space-time code constructions are provided. The code construction is based on Cyclic Division Algebras. The codes constructed are sphere decodable and in some instances incur minimum possible delay. Included in our results is the perhaps surprising finding that the OAF and NAF protocols have identical DMT when the time durations of the broadcast and cooperative phases are optimally chosen to suit the respective protocol. Two variants of the NSDF protocol are considered: fixed-NSDF and variable-NSDF protocol. In the variable-NSDF protocol, the fraction of time occupied by the broadcast phase is allowed to vary with multiplexing gain. In the two-relay case, the variable-NSDF protocol is shown to improve on the DMT of the best previously-known static protocol for higher values of multiplexing gain. Our results also establish that the fixed-NSDF protocol has a better DMT than the NAF protocol for any number of relays. Coding Theory Computer Communication Protocols Cyclic Division Algebras Cyclic Division Algebra Codes Diversity-Mulplexing Gain Tradeoff (DMT) Cooperative Communication Protocols Communications Engineering
3	Precoder Design Based on Mutual Information for Non-orthogonal Amplify and Forward Wireless Relay Networks Syed, Tamseel Mahmood 09 June 2014 (has links) No description available. Computer Engineering Design Electrical Engineering Engineering Literature Systems Design Systems Science Theoretical Mathematics Cooperative Communication wireless network reliability data-rate NAF space-time code non-orthogonal amplify and forward information theory mutual information PEP precoder SNR closed form symbol grouping receiver complexity Tamseel Syed

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