【摘要】：研究適用于無(wú)線信道測(cè)量的定時(shí)偏移和信道聯(lián)合估計(jì)方法.發(fā)射機(jī)發(fā)送具有循環(huán)前綴結(jié)構(gòu)的導(dǎo)頻信號(hào)段.接收機(jī)根據(jù)粗同步信號(hào)確定快速傅里葉變換的窗口起始位置.利用改進(jìn)時(shí)域最小二乘信道估計(jì)和變換域?yàn)V波,獲得高精度的信道估計(jì)值.對(duì)頻域接收導(dǎo)頻信號(hào)段的定時(shí)偏移進(jìn)行精細(xì)估計(jì),對(duì)定時(shí)偏移量進(jìn)行濾波并累加.最后,對(duì)頻域接收導(dǎo)頻信號(hào)段進(jìn)行定時(shí)偏移補(bǔ)償.信道估計(jì)器、定時(shí)延遲偏移精細(xì)估計(jì)器與補(bǔ)償單元三者構(gòu)成迭代相干延遲鎖定環(huán)路.仿真結(jié)果表明:采用迭代相干聯(lián)合估計(jì)方法進(jìn)行精細(xì)定時(shí)延遲估計(jì)的性能明顯優(yōu)于非相干方法.
[Abstract]:The timing offset and joint channel estimation methods for wireless channel measurement are studied. The transmitter transmits a pilot signal segment with a cyclic prefix structure. The receiver determines the starting position of the fast Fourier transform window according to the coarse synchronous signal. The improved time-domain least squares channel estimation and transform domain filtering are used to obtain high-precision channel estimation. The timing offset of the received pilot signal segment in the frequency domain is precisely estimated, and the timing offset is filtered and accumulated. Finally, the timing offset compensation is carried out for the frequency domain received pilot signal segment. Channel estimator, timing delay offset fine estimator and compensation unit constitute iterative coherent delay locking loop. The simulation results show that the performance of the iterative coherent joint estimation method for fine timing delay estimation is obviously better than that of the non-coherent method.
【作者單位】： 東南大學(xué)毫米波國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(61132003) 國(guó)家重點(diǎn)基礎(chǔ)研究(973)計(jì)劃(2013CB329002) 江蘇省自然科學(xué)基金(BK2011019,BK20130631) 國(guó)家科技重大專(zhuān)項(xiàng)(2014ZX03004006-005)
【分類(lèi)號(hào)】：TN92

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