OFDM系統(tǒng)中基于符號(hào)間相位差分調(diào)制的頻偏估計(jì)模糊度校正算法
Frequency Ambiguity Resolution Algorithm for OFDM Systems Based on Phase Differential Modulation between Adjacent Symbols
-
摘要: OFDM系統(tǒng)的性能對(duì)頻率偏移非常敏感。該文針對(duì)OFDM系統(tǒng)頻偏估計(jì)中所產(chǎn)生的模糊度問(wèn)題提出了一種基于符號(hào)間相位差分調(diào)制的頻偏估計(jì)模糊度校正算法。它通過(guò)在相鄰OFDM符號(hào)中相同子載波間進(jìn)行相位差分調(diào)制來(lái)校正頻偏估計(jì)模糊度。文中從理論上給出并證明了算法具有唯 可辨識(shí)性的充分條件,并分析比較了算法的復(fù)雜度和定時(shí)誤差對(duì)算法性能的影響。理論分析和仿真結(jié)果表明,在性能相近的前提下,該文提出的頻偏估計(jì)模糊度校正算法具有運(yùn)算量小和對(duì)定時(shí)誤差不敏感的優(yōu)點(diǎn)。
-
關(guān)鍵詞:
- OFDM; 相位差分調(diào)制; 頻偏估計(jì)模糊度校正
Abstract: OFDM systems are sensitive to the frequency offset. In this paper, a novel frequency ambiguity resolution algorithm in OFDM systems based on phase differential modulation between adjacent symbols is proposed to correct the frequency ambiguity. The sufficient condition for the proposed algorithm to achieve unique identifiability is deduced. Moreover, the computational complexity of the proposed algorithm and the sensitivity of the proposed algorithm to the timing error are also analyzed in the paper. Theoretical analysis and computer simulations show that the proposed algorithm has the low complexity advantage over conventional algorithm while maintaining approximately the same performance. -
Binghrm J. Multicarrier modulation for data transmission: An idea whose time has come[J].IEEE Communications Magazine.1990, 28(5):5-[2]Speth M, Fechtel S A, Fock G, et al.. Optimun receiver design for wireless broad-band systems using OFDM-Part Ⅰ[J].IEEE Trans.on Communications.1999, 47(11):1668-[3]Speth M, Fechtel S A, Fock G, et al.. Optimun receiver design for OFDM-based broadband transmission-Part□[J].IEEE Trans. on Communications.2001, 49(4):571-[4]Morelli M, DAndrea A N, Mengali U. Frequency ambiguity resolution in OFDM systems[J].IEEE Communications Letters.2000, 4(4):134-[5]Moose P H. A technique for orthogonal frequency division multiplexing frequency offset correction[J].IEEE Trans. on Communications.1994, 42(10):2908-[6]Bang K, Cho N, Cho J, et al.. A coarse frequency offset estimation in an OFDM system using the concept of the coherence phase bandwidth[J].IEEE Trans. on Communications.2001, 49(8):1320-[7]Schmidl T M, Cox D C. Robust frequency and timing synchronization for OFDM[J].IEEE Trans. on Communications.1997, 45(12):1613-[8]Seo B S, Kim S C, P ark J. Fast coarse estimator of carrier frequency offset for OFDM systems[J].Electronics Letters.2002,38(12):1520- -
計(jì)量
- 文章訪問(wèn)數(shù): 2373
- HTML全文瀏覽量: 132
- PDF下載量: 751
- 被引次數(shù): 0
下載:
