Cooperative Communication Technology Based On LDPC Code

With the increasing use of wireless devices, wireless communication problemsis increasingly prominent. Multipath fading is undoubtedly an important factor inthe development of wireless communication. Recently the rapid development ofmultiple-input and multiple-output (MIMO) technology can effectively combat theimpact of multipath fading. However, due to size,cost,facilities, and other difficultconditions influence the practical application of wireless terminal devices. Currentlycooperative communications technologies through collaborative use of wirelessdevices make the single-antenna terminals to form a virtual multiple-input andmultiple-output system, to obtain the space diversity gain.High-speed data and multimedia services will be trend of the future of wirelesscommunications, and collaborative communication is aim to improve the reliabilityof the transmission through the full utilization of network resources. The channelcoding techniques are applied to collaborative communication will make theadvantages of cooperative communication technologies further amplified. The maincontent of this paper is cooperative communication technology based on LDPCcode.First, the basic principles of construction principles and decoding method ofLDPC code will be described and we will select the most appropriate code lengthand code rate. As the current study hottest encoding LDPC codes has the advantageof approaching the Shannon limit. As a linear code, the decoding method has thepotential advantages. In this paper, we use the binary regular LDPC code as the codemethod of cooperative communication.Then we will study the basic relay cooperative communication protocols,including Amplify and Forward(AF), Decode and Forward(DF), and CodedCooperation(CC).At last we will combine LDPC code and cooperative communicationtechnology, Using Matlab simulation get the curve through the system underdifferent channel states, then we will compare that with the traditional cellular user.At last we will analysis the factors which affect the performance of the cooperativesystem.