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Transmission delay control for single frequency OFDM multi-base-station in a cell using position information

机译:使用位置信息的小区中单频OFDM多基站的传输延迟控制

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In this paper, a system with "multi-base-station in a cell" using single frequency network (SFN) orthogonal frequency division multiplex (OFDM) is proposed as a basic concept of the 4th generation mobile system (4G). The proposed system image consists of several cells in a larger cell and it works as follows: first, a sub-base station (S-BS) is set to transmit partially at the place where the received signal power is below the desired one, because of increase of path loss while operating at high frequency, and under shadowing; secondly, base stations (BSs) and S-BSs transmit the same information at the same time by SFN-OFDM, so paths having in good condition may exist. However, at a receiver the timing offset in arrival between paths of BSs and S-BSs leads to inter-symbol interference (ISI) which is the largest considerable problem. So a "transmission delay control" scheme using position information from the Global Positioning System (GPS) is also proposed. We discuss the usefulness of the proposed system against path loss increase and shadowing, and furthermore confirm that the proposed scheme is effective in operation at high speed rate.
机译:在本文中,提出了一种使用单频网(SFN)正交频分复用(OFDM)的“小区中的多基站”系统,作为第四代移动系统(4G)的基本概念。提议的系统映像由一个较大的小区中的几个小区组成,其工作方式如下:首先,将子基站(S-BS)设置为在接收信号功率低于所需信号功率的地方部分发射,因为在高频和遮蔽下工作时路径损耗的增加;其次,基站(BS)和S-BS通过SFN-OFDM同时发送相同的信息,因此可能存在状况良好的路径。然而,在接收机处,BS和S-BS的路径之间到达的定时偏移导致符号间干扰(ISI),这是最大的重大问题。因此,还提出了一种使用来自全球定位系统(GPS)的位置信息的“传输延迟控制”方案。我们讨论了所提出的系统对抗路径损耗增加和遮蔽的有用性,并且进一步证实了所提出的方案在高速运行下是有效的。

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