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On the Algorithms and Implementation of IEEE802.16d OFDM Synchronization and Channel Estimation

Author: SunHu
Tutor: ZhangChaoYang
School: Zhejiang University
Course: Information and Communication Engineering
Keywords: IEEE 802.16d OFDM Timing synchronization Carrier frequency offset synchronization Sampling frequency offset tracking Channel estimation DSP
CLC: TN919.3
Type: Master's thesis
Year: 2006
Downloads: 368
Quote: 9
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Abstract


With the rapid development of the Internet and the rapid growth of the demand for personal communications , global communications increasingly \IEEE802.16 d / e standards as broadband access solutions -oriented wireless metropolitan area network (WMAN) , with excellent performance and broad market prospects , attracting much attention . Easy to achieve cost for fixed broadband access IEEE802.16d OFDM system has become the first : first to promote the application of commercial standards . This paper focuses on the physical layer of IEEE802.16d OFDM system synchronization and channel estimation technology research , and AD 's DSP chip TS201 partial synchronization algorithm . This paper first introduces the development and current status of the WiMAX technology and analysis summarizes the advantages and disadvantages of OFDM modulation technique commonly used in WiMAX systems . The second chapter is one of the core content of the full text of theoretical studies , the main receiver synchronization . First transmitting side process according to the logistics system IEEE802.16d OFDM layer structures baseband simulation link analyzes the synchronization error of the received signal and the frequency word and the guide according to the preamble of the system structure , and then according to a simplified OFDM system model proposed the timing synchronization , carrier frequency offset estimation and sampling frequency offset tracking method . Chapter apply to research IEEE802.16d OFDM system channel estimation techniques . By directly using the long preamble to do channel estimation , the pilot is mainly used to track the residual carrier frequency offset and sampling frequency offset , the simulation results show that this method can achieve good results in AWGN and SUI channel . Decision feedback channel estimation method in IEEE802.16d OFDM system , the simulation results show that the method can be enhanced mobile performance to some extent . Finally, given the timing synchronization algorithm , time-domain fractional frequency offset estimate unbiased estimate of the integer frequency and frequency-domain implementations of the algorithm on the AD 's DSP chip TS201 specific description of the implementation of the optimization program .

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