OFDM定時同步并行算法研究與實現(xiàn)
[Abstract]:In the field of wireless communication, orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology has been widely used because of its strong anti-fading ability, strong anti-symbol interference ability, high spectral efficiency and so on. However, OFDM technology also has inherent limitations, mainly because OFDM system is sensitive to synchronization error. Without accurate synchronization algorithm, reliable data transmission can not be guaranteed. Synchronization technology is directly related to the performance of communication system, and OFDM timing synchronization is the premise of all other synchronization. So how to realize timing synchronization has already become an important problem in this field. With the increasing workload of data storage, transmission and processing, how to improve the speed of timing synchronization algorithm is becoming one of the hot issues in wireless communication systems. The rapid development of graphics processor (Graphics Processing Unit, GPU) has brought a new solution to this problem. Because the computing power and memory bandwidth of GPU has reached 100 times or even more than that of CPU (Central Processing Unit, CPU) in the same period, GPU provides an efficient platform for high performance computing. However, due to the limitation of GPU hardware structure, it is very difficult for programmers to utilize the resources of GPU effectively for general computation. Nvidia (NVIDIA) 's unified computing device architecture, (Compute Unified Device Architecture, CUDA), has changed the situation. CUDA can use GPU's powerful computing power to do general computing, and it is based on C language. Make it very easy for programmers to develop programs on GPU. This paper discusses how to realize the parallelization of timing synchronization algorithm using CUDA architecture and improve the speed of the algorithm. The main works are as follows: (1) the timing synchronous serial algorithm based on cyclic prefix is implemented on CPU. (2) the parallel parts of the serial algorithm are summarized and rewritten, and then executed on GPU. (3) using Matlab to write timing synchronization program to verify the correctness of the simulation results of serial algorithm and parallel algorithm, and compare the time of serial algorithm and parallel algorithm execution. The results show that the parallel algorithm based on GPU consumes much less time than the serial algorithm based on CPU. (4) finally, according to the results, the bottleneck of parallel computing on GPU is pointed out, and some corresponding optimization strategies are given.
【學(xué)位授予單位】:東北大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN929.53
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