协同通信与AF和DF中继协议详情.doc

实用文案 标准文档 Abstract Nowadays, there is a trend for communication system that the whole network system is becoming dynamic so that there are always having devices should be embedded and removed. Conventional wired communication, due to the complexity of cabling, does not adapt to the modern communication system. Wireless technique has been used widely because devices can be connected by electromagnetism wave without cabling. However, low transmitting reliablity because of inter-interference between electromagnetism waves is the key problem of wireless communication. Based on this, this thesis investigates one of the technique called cooperative communication and it cooperative protocols. Cooperative communication is a virtual multiple-input multiple-output(MIMO) system. To increase the reliability of signal transmitted without increasing the amount of communication devices, this technology tries to make each antennas have one or more partners that assist them to transmit the signal. In wireless network, the devices not only transmit their own signal but also assist their “partner” to transmit their signal for saving the cost of installation of additional antennas at both receiver and sender In this thesis, we focus on introducing three main protocols in cooperative communication: Amplify-and –Forward(AF), Decode-and-Forward(DF) and Coded Cooperation(CC). The performance and mathematical equations of AF and DF are analysed , and then MATLAB programs were created to simulate the performance of these two protocols. About the three protocols, the main procedures are also introduced. The performance comparison for AF and DF in different signal-to-noise(SNR) are demonstrated. The result presents that the DF protocols has better performance than AF. Finally, some recommendations and future work are mentioned at the end of the thesis. Table of Contents Abstract Table of contains List of figures List of abbreviations and Symbols 1 Introduction................................