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首页> 外文会议>International Conference on ITS(Intelligent Transport Systems Standardization) Telecommunications Proceedings(ITST2006); 20060621-23; Chengdu(CN) >A Roadside Downlink Wireless Transmission Scheme Using OFDM and Virtual MIMO
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A Roadside Downlink Wireless Transmission Scheme Using OFDM and Virtual MIMO

机译：使用OFDM和虚拟MIMO的路边下行无线传输方案

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摘要

In this paper, a downlink wireless transmission scheme is proposed for roadside deployment. The scheme is based on Orthogonal Frequency-Division Multiplexing (OFDM) technology, and it also employs virtual Multiple Input Multiple Output (MIMO) to further improve system capacity. In the "virtual" MIMO scheme proposed in this paper, signals can be sent from two base stations (BS) to one user, which creates a virtual MIMO system that may offer additional capacity gains in fading channels. This scheme is especially fit for the bi-sectional BSs with zonal coverage along roadside. Simulation results show that the proposed scheme can support both high and low speed users on road, and achieve a high system capacity gain especially in the cell edge. Within this scheme, the OFDM symbols are characterized into two groups: localized resource group (LRG), which is continuous in time-frequency (TF) domain; and distributed resource group (DRG) which is TF discrete. As LRG is fit for low-speed users to utilize the slowly varying channel while DRG is fit for high-speed users with rapid varying channels, the combination of them makes the allocation of OFDM subchannel more elastic to support users with different speed.
机译：本文提出了一种下行无线传输方案，用于路边部署。该方案基于正交频分复用（OFDM）技术，并且还采用虚拟多输入多输出（MIMO）来进一步提高系统容量。在本文提出的“虚拟” MIMO方案中，可以将信号从两个基站（BS）发送到一个用户，这将创建一个虚拟MIMO系统，该系统可以在衰落信道中提供额外的容量增益。该方案特别适用于路边区域覆盖的两部分式BS。仿真结果表明，该方案可以同时支持高速和低速用户，尤其是在小区边缘，可以实现较高的系统容量增益。在此方案中，OFDM符号分为两类：局部资源组（LRG），在时频（TF）域中是连续的；以及TF离散的分布式资源组（DRG）。由于LRG适合低速用户使用缓慢变化的信道，而DRG适合具有快速变化信道的高速用户，它们的组合使OFDM子信道的分配更具弹性，以支持不同速度的用户。

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