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首页> 外文期刊>WSEAS Transactions on Communications >Synchronization and Cell Search Algorithms in 3GPP Long Term Evolution Systems (FDD mode)
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Synchronization and Cell Search Algorithms in 3GPP Long Term Evolution Systems (FDD mode)

机译：3GPP长期演进系统（FDD模式）中的同步和小区搜索算法

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摘要

In this paper initial downlink synchronization (sync) and cell identification algorithms for the 3rd generation partnership project (3GPP) long term evolution (LTE) systems are presented. The frequency division duplex (FDD) mode is used in the downlink radio frame structure. A user equipment digital receiver architecture is proposed. The orthogonality of signals in orthogonal frequency division multiplexing (OFDM) may be lost due to some impairments such as frequency, time, and phase offsets. Therefore, major parts of this research are involved in restoring the orthogonality at the user equipment (UE) by using some techniques to estimate the sync parameters, and to detect cell identity among candidate cells based on sync signals. A Farrow structure interpolator is used to compensate the fractional timing offset. Both inter site synchronous and inter site asynchronous networks are presented. Computer simulations are used to demonstrate the performance of the proposed schemes with multipath Rayleigh fading channel, frequency offsets, timing offsets, and additive white Gaussian noise (AWGN). Results show high probability of cell identification in a very short time 20 ms in both multi cell model scenarios, especially when multiple input multiple output (MIMO) technique, oversampling at the UE, and high order Farrow structure interpolator are used.
机译：本文介绍了第三代合作伙伴计划（3GPP）长期演进（LTE）系统的初始下行链路同步（sync）和小区识别算法。在下行链路无线电帧结构中使用频分双工（FDD）模式。提出了一种用户设备数字接收机架构。由于诸如频率，时间和相位偏移之类的某些损害，正交频分复用（OFDM）中的信号正交性可能会丢失。因此，该研究的主要部分涉及通过使用一些技术来估计用户参数（UE）的正交性，以估计同步参数，并基于同步信号来检测候选小区之间的小区标识。 Farrow结构插值器用于补偿分数定时偏移。介绍了站点间同步和站点间异步网络。使用计算机仿真来证明所提出的方案在多径瑞利衰落信道，频率偏移，时序偏移和加性高斯白噪声（AWGN）下的性能。结果表明，在两种多小区模型场景中，在非常短的20 ms时间内，小区识别的可能性都很高，尤其是当使用多输入多输出（MIMO）技术，UE处的过采样和高阶Farrow结构插值器时。

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