| With the rapid progress of core technology, the next development of LTE (Long Term Evolution) will focus on its large-scale application and industrialization. However, the existing LTE system simulator can not meet the testing requirements of LTE terminals. In order to realize comprehensive test and accelerate commercial process, it is high time to develop stable and full-featured LTE system simulator.At present, the processing rate of physical layer uplink can only reach32Mbps, far from the peak rate50Mbps. Aiming at the problem, this paper will present the optimization of simulator from two ways--performance and function.The performance improvement means to accelerate uplink data processing. Firstly, research the PUSCH (Physical Uplink Shared Channel) processing procedure and find out time consuming modules, such as de-interleaving, Turbo decoding, demodulation. Secondly, adjusting framework, improving memory allocation, arranging module pipelining is adopted to optimize PUSCH processing.As for the development of functionality, uplink frequency-hopping is replenished into the resource element mapping and the data merging is improved in retransmission module.The processing efficiency of optimized simulator has been compared with previous modules which feasibility has been confirmed. After optimization, the uplink processing rate of LTE system simulator can reach46Mbps, increasing the speed43.57%. |
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