Channel-independent synchronization of orthogonal frequency division multiple access systems

被引：139

作者：

Barbarossa, S ^{[1
]}

Pompili, M

Giannakis, GB

机构：

[1] Univ Roma La Sapienza, INFOCOM Dept, I-00184 Rome, Italy

[2] Marconi Mobile, I-00040 Rome, Italy

[3] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

来源：

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS | 2002年 / 20卷 / 02期

基金：

美国国家科学基金会;

关键词：

multicarrier systems; multiple access; synchronization;

D O I：

10.1109/49.983375

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We develop synchronization algorithms for both the downlink and the uplink of quasi-synchronous and asynchronous orthogonal frequency division multiple access systems. Unlike existing alternatives, the proposed time- and carrier-offset estimators do not require the transmission of known sequences and exhibit performance independent of the underlying channel zero locations. The only necessary assumption is that there are virtual subcarriers which are not occupied by any user. We derive a closed-form variance expression for the carrier-offset estimator at high signal-to-noise ratio (SNR), as a function of the number of active users and the SNR. We compare our method with alternative ones and validate our theoretical derivations with simulation results.

引用

页码：474 / 486

页数：13

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