.'s Tdd-lte Uplink Channel Detection Technology And Dsp Implementation

With the increasing of requirement in various data services, the 3G mobile communication system is losing attraction to the market. The evolution of 3G has been focused on. LTE (Long Term Evolution) is a standard that proposed by 3GPP for the next generation of mobile broadband network. By using the next generation air interface technique which is based on OFDM and MIMO, the system bandwidth and data speed are increased.As one of the most important technique for LTE, the uplink channel sounding provides precise channel messages to higher system for allocating and scheduling the frequency resource. This technique is researched and applied on DSP in this thesis.The physic layer of uplink is introduced firstly, including the structure, the time-domain and frequency-domain resources. The SC-FDMA that used for uplink transmission and the mapping of subcarriers are also analyzed. According to the spec and various resolutions, sounding reference signal (SRS) has been introduced, including the configuration in time/frequency domain, the periodicity and sounding bandwidth. Thus, the SRS sequence can be generated by using the spec and the characters such as cyclic shift. Then combining with the SC-FDMA technique, the transmitter of SRS is designed. According to the structure of transmitter, the receiver of SRS has also been designed.Because it is possible to sounding the same frequency-domain range by multiple UEs, the traditional methods of channel estimation do not adapt to this system. A new method of channel estimation based on the characters of ZC sequence and cyclic shift has been proposed and used to get the value of channel transfer function (CTF). Then, combined with the simulation of transmitter and receiver, the validity of this channel estimation is proved. Thus the full processing of uplink sounding has been completed.The receiver of SRS has been implemented on the MSC8156 and also been tested finally.