Research And Implement Of PUCCH Based On CA Technique In TD-LTE-A

The past two decades have witnessed incredible advancement of cellular communication, a rapid growth in the number of subscribers and new technologies. With the increasing demand for high-quality wireless multimedia services, the radio access technologies continue to advance with faster pace toward the next generation of system. ITU(International Telecommunication Union) unified the fourth generation cellular communication standard into IMT-Advanced. TD-LTE-A submitted by 3GPP with carrier aggregation enables operators to maximally and optimally utilize their available spectrum resources for increased data rates and user experience while reducing their incurred opex and capex.This thesis is based on “Experiment Equipment Development of TD-LTE-A System”, which is a major project of the National Science and Technology. The main focus of this dissertation is about CA Technique. The main contributions are organized as follows:Firstly, presents PUCCH(Physical Uplink Control Channel) based on CA Technique in TD-LTE-A system. Taking the PUCCH format 3 as an example, this new format of PUCCH for supporting CA is introduced in detail from both the processes and modules.Secondly, through the MATLAB simulation found that. Due to CA technology is introduced, causing high PAPR(Peak of Average Power Ratio), seriously affected the performance of the communication system. In view of this shortcoming, on the basis of studying the existing algorithm for reducing the PAPR, combining the characteristics of FFT, we propose an improved PTS(Partial Transmit Sequences) algorithm, it's easy to implement and low complexity. Through the simulation show that the improved algorithm can effectively improve the performance of the system. The design and realization of this algorithm on C6455 DSP chip has been introduced. The storage space and required running period of the realization process show that the realization scheme in this thesis can meet requirement of the project.Finally, combining HARQ technique principle, the feedback mode of HARQ information under carrier aggregation is studied. More focused on the HARQ feedback mode when the Component Carrier is more. Based on how to reduce the delay of HARQ feedback, improves the existing method of HARQ feedback, reduce the delay of HARQ feedback about 23.1%.