DSP Implementation Of LTE Uplink Physical Layer Receiver

With the widely development of3G technology, people can easily contactnetwork, social media. People’s requirements for the data transmission speed aregrowing. LTE is the new wireless technology which is put forward by the3GPP. Itis more effic ient than3G in spectrum utilization. It can provide higher datatransmission speed than3G. Some time later, LTE will be widely developed. But thecarrier frequency of LTE is very high, its penetration is limited. Hence, the qualityof signal is not well inside. The Small Cell is put forward to solve this problem. TheSmall Cell can provide good signa l. Besides, it is very cheap and convenient. It willplay an important role in LTE.This paper researches the uplink physical channel of TD-LTE Small Cell.Introduce the system structure of TD-LTE’s physical layer. The generation methodof SC-FDMA signal is introduced in the paper. What is more, this paper introducesthe physical layer receiver how to receive data. The whole process of receiving canbe divided into nine modules. Remove cycle prefix module, Remove phase rotationmodule, FFT module, Dexplace module, Deremap ing module, Channel estimationmodule, Channel equalization module, IDFT module, Deqam module. The FFTmodule is based on the4-pt FFT and2-pt FFT. The algorithm of channel estimationis ZF or MMSE. The algorithm of deqam is soft demodulation.Finally, this project uses the special DSP chip to implement the receiver.Besides, it uses the scalar instructions, vector instructions, and parallel instructionsto increase the computational speed of DSP. Optimizing some receiver modulesincrease the processing speed of system. Building the floating-point data model inVC compares with the results of DSP system to improve the way of fixed-point. Atlast, the paper verifies the performance of the PUSCH receiver and calculates theBLER by whole link simulation.