Essay about What´s Cooperative Space-time Coding - 889 Words

Literature Survey: Cooperative diversity for a simple three-terminal relay channel was first introduced in [12]. Later, in [1], several improvements were made in capacity bounds and cooperative schemes, such as decode-and-forward, were introduced. Modifications to amplify-and-forward scheme were proposed in [13-16]. Based on these, more relaying schemes were introduced in [17-24]. The performance and other characteristics of the aforementioned schemes in several environments were studied in [17-27]. Extensions to a multi-terminal, multihop network were made in [13-17], where a clustered model and ad hoc network architecture were studied and useful results for transmit and receive diversity gains and relaying strategies were obtained.†¦show more content†¦Multiple-input multiple-output (MIMO) [2, 3, 30, 31] systems were introduced in order to enhance the performance of the wireless communications systems to provide robustness, high data rates, and reliability by overcoming th e channel fading with the use of multiple antennas. A MIMO system offers redundancy through the multiple independent channels, which are created between the transmitting and the receiving antennas of the system. Using multiple-input multiple output systems, significant improvements are made in the coverage ranges of the communication systems and the data throughput without the need for additional transmission power or bandwidth expansion. Cooperative diversity can also be used to increase the coverage area (e.g., cellular networks) as was investigated in [2] For decode and forward if no MRC is deployed then the optimum location is midway between the source and the destination, but if MRC is used then the optimum location is towards the source as derived in [2]. A distributed relay assignment algorithm was also given in [2]. It also addresses the problem of relay–source assignment. The optimum locations of relay for decode and forward and amplify and forward have also been proposed by the author. Simon, Marvin K et al., in [3] presented a unified approach to evaluating the error rate performance of digital communication system over fading channels. The classical relay channel was introduced by Van der Meulen [4] models a three terminalShow MoreRelatedSecurity Analysis Of A Protocol For Pollution Attack Detection1459 Words   |  6 PagesAttack Detection† is based on the concept of network coding. 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