Research&Implementation On Physical Layer Downlik Control Channels In Long Term Evolution-Advanced

With the rapid development of communication technologies, the key technologies and links of LTE-A have become the global research hotspots. In the process of its commercial applications, test instruments are important points to promote terminals to be used spreadly. The functions of LTE system simulators have been unable to meet the demand of the need of test. As a result, LTE-A system simulators with more stable performance and more perfect become the main direction.Compared with LTE, the performance indexes of LTE-A have been improved greatly. To achieve these indexes, a number of new technologies are proposed. The increase of these technologies generates a lot of control informations, so that the original control channels cannot meet the requirements. To ensure the provision of physical resources, LTE-A protocols make new adjustments to the physical layer. As the support of LTE-A system simulators, the functions of physical layer will make an important impact on the performance of systems.On the foundation of studying the processes of physical downlink control channels (PCFICH, PHICH, PDCCH, EPDCCH), each module of them is researched, including the CRC, encoding, rate matching, channel multiplexing and scrambling, modulation, resourse element mapping and OFDM. After that, the design of software is made.In this paper, based on the process of downlink control channels and the design of modules, the processes of channels have been developed with C language on the existing hardware platform of LTE test instruments. It makes the control information can be sent correctly under the configurations, according to the parameters.Finally, the functions of the above four downlink contol channels get tested and the results are analyzed briefly, and the correctness of the development is proved. It realized the basic requirements for the physical layer of LTE-A in3GPP R11.