摘要
正交频分复用多址接入(OFDMA)是以正交频分复用技术(OFDM)为基础的多用户接入技术,作为IEEE802.16e的主流技术,必将推动整个蜂窝移动通信的发展。在OFDMA系统中,同步误差对系统性能具有重要的影响,不仅仅会破坏子载波之间的正交性,造成信道间干扰(ICI)和符号间干扰(ISI),而且还会引入多址干扰(MAI)。为了最大限度地消除同步误差对通信系统性能的影响,文中提出一种时域新型同步算法,对多用户OFDMA系统上行的时偏和频偏进行联合估计。分析与仿真结果表明,该方法同步精度优于传统的单独考虑频偏或者时偏的估计方法,且在与传统估计方法保持相同性能时还保持了较低的复杂度,有效地提高了系统性能。
Orthogonal frequency division multiple access ( OFDMA) which is a technology of multi-user access based on OFDM, as IEEES02 16e mainstream technology, will promote the development of the cellular mobile communications. In OFDMA system,the syn- chronization errors play an important role,they not only destroy the orthogonality among subcarriers,resulting in ICI and ISI,but also in- troduce multi-access interference (MAI). To eliminate the synchronization error's impact on system performance,propose a novel meth- od to estimate jointly time offsets (TOs) and cartier frequency offsets { CFOs) in the time-domain for multi-user in the OFDMA up- link. The method is shown to offer good accuracy, while maintaining a reasonable complexity compared to conventional estimation schemes and it improves the system performance effectively.
出处
《计算机技术与发展》
2012年第7期102-105,共4页
Computer Technology and Development
基金
江苏省普通高校研究生科研创新基金(CXLX11_0400)