基于采樣點(diǎn)選擇和矢量旋轉(zhuǎn)的多載波CDMA定時(shí)跟蹤方案
A Reduced Complexity Timing Tracking Scheme for Multi-Carrier CDMA Signals Based on Samples Selecting and Vector Rotation
-
摘要: 針對(duì)多載波CDMA系統(tǒng)的特點(diǎn)，該文提出一種基于采樣點(diǎn)選擇和矢量旋轉(zhuǎn)的全數(shù)字定時(shí)跟蹤方案。該方案充分利用準(zhǔn)時(shí)路復(fù)相關(guān)矢量信息，通過矢量旋轉(zhuǎn)得到非相干定時(shí)誤差檢測(cè)量，進(jìn)行定時(shí)跟蹤調(diào)整。理論分析和數(shù)值結(jié)果表明，該方案較傳統(tǒng)的延遲鎖定跟蹤方案明顯降低了實(shí)現(xiàn)復(fù)雜度，而且性能有所提高。
-
關(guān)鍵詞:
- 多載波CDMA;延遲鎖相環(huán);矢量旋轉(zhuǎn);采樣點(diǎn)選擇
Abstract: A reduced-complexity all-digital timing tracking scheme suited for multi-carrier CDMA signals is proposed and studied. Based on samples selecting and vector rotation of correlation output vector at only on time channel, timing error detection statistics are approximately acquired and timing adjustment are carried out. Theoretical and numerical results show that the new scheme has an improved performance and remarkable complexity simplicity as compared with the classical digital delay-locked loop. -
Hara S, Prasad R. Overview of multicarrier CDMA. IEEE Communication Magazine, 1997, 35(12): 126-133.[2]Kondo S, Milstein L B. Performance of multicarrier DS CDMA systems[J].IEEE Trans. on Communications.1996, 44(2):238-246[3]Schmidl T M, Cox D C. Robust frequency and timing synchronization for OFDM[J].IEEE Trans. on Communications.1997, 45(12):1613-1621[4]Minn H, Zeng M, et al.. On timing offset estimation for OFDM systems[J].IEEE Communications Letters.2000, 4(7):242-244[5]曹葉文, 項(xiàng)海格. 多載波頻率分集擴(kuò)展頻譜通信的同步原理分析. 通信學(xué)報(bào), 1997, 18(1): 34-39.[6]汪曉陽, 張朝陽等. 利用采樣點(diǎn)選擇法實(shí)現(xiàn)DS-CDMA中頻接收機(jī)的碼片同步. 電路與系統(tǒng)學(xué)報(bào), 2000, 5(1): 95-99.[7]Gaudenzi R D, Luise M. A digital chip timing recovery loop for band-limited direct sequence spread spectrum signals[J].IEEE Trans. on Communications.1993, 41(11):1760-1769 -
計(jì)量
- 文章訪問數(shù): 2195
- HTML全文瀏覽量: 79
- PDF下載量: 657
- 被引次數(shù): 0
下載:
