利用CAZAC序列的OFDM頻率同步方法
New Frequency Offset Estimation Methods for OFDM Systems by Using CAZAC Sequence
-
摘要: 頻率偏移估計是OFDM (Orthogonal Frequency Division Multiplexing)的關(guān)鍵技術(shù)。該文提出了在一個OFDM符號內(nèi)利用兩個重復(fù)的CAZAC (Constant Amplitude Zero Auto Correlation)序列進行頻率偏移估計的新方法，估計范圍可達整個OFDM帶寬。用于同步的訓(xùn)練序列還可用于信道估計和均衡，這將提高系統(tǒng)的數(shù)據(jù)傳輸效率。此算法同步精度達到了Schmidl提出的Cramer-Rao bound，有效性在AWGN和Rayleigh多徑信道下得到了驗證。
-
關(guān)鍵詞:
- OFDM;頻率同步; CAZAC序列; 多徑衰落信道
Abstract: In this paper a new method for frequency offset estimation is proposed where the training sequence is composed of two Constant Amplitude Zero Auto Correlation (CAZAC) sequences in one OFDM symbol and the frequency offset up to OFDM bandwidth can be detected. The training sequence also can be used for channel estimation and equalization. This will enhance the efficiency of data transmission. Cramer-Rao bound can be reached in the estimation. The valid of the algorithm is verified in AWGN channel and Rayleigh channel. -
ETS 300 401 Second Edition, Radio broadcasting systems; Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers [S]. 1997.[3]Reimers U. DVB-T: the COFDM-based system for terrestrial television [J].Electronics Communication Engineerig Journal.1997, 9(1):2832-[8]嚴春林, 李少謙, 唐友喜, 房家奕, 羅霄. 利用重復(fù)序列和循環(huán)前綴的OFDM頻率同步新方法. 電波科學(xué)學(xué)報，2005, 20(6):[13]Tureli U, Liu H, Zoltowski M D. OFDM blind carrier estimation: ESPRIT [J].IEEE Trans. on Communications.2000, 48(9):1459-[14]Morelli M, Mengali U. An improved frequency offset estimator for OFDM applications[J].IEEE Communications Letters.1999, 3(3):75-[16]Bomer L, Antweiler M. Perfect N-phase sequences and arrays[J].IEEE J. on Select. Areas Commun.1992, 10(4):782-[18]Tellambura, C, Parker M G, Guo Y J, Shepherd S J, Barton S K. Optimal sequences for channel estimation using discrete Fourier transform techniques[J].IEEE Trans. on Communications.1999, 47(2):230-[21]Kim Yun Hee, Song Iickho, Yoon Seokho, Park So Ryoung. An efficient frequency offset estimator for OFDM systems and its performance characteristics[J].IEEE Trans. on Vehicular Technology.2001, 50(5):1307- -
計量
- 文章訪問數(shù): 2706
- HTML全文瀏覽量: 120
- PDF下載量: 2181
- 被引次數(shù): 0
下載:
