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A single frequency OFDM communication system selects from two modulation schemes dependent on the presence of signal to be transmitted locally.

机译:单频OFDM通信系统取决于要本地传输的信号的存在,从两种调制方案中进行选择。

摘要

A single frequency communications system (e.g. DVB, NGH) comprising a plurality of base stations (BS) each comprising an OFDM transmitter comprising: a first input (e.g. a national television transmission) from a first data pipe 82; a second input (e.g. a local television transmission) from a local service insertion data pipe 84; and a modulator which modulates the sub-carrier signals of OFDM symbols with either the data from the first data pipe y0y1y2y3, using a lower order modulation scheme 94 (e.g. M-QAM), or the data form the first data pipe and the local service insertion data pipe h0h1, using a higher order modulation scheme 96 (e.g. at least 2M-QAM). A sub-set of BSs transmit data from the first data pipe and the local insertion pipe and another sub-set of BSs transmit data from the first data pipe only. Clusters may be formed of predetermined numbers of BSs each BS being assigned to one of a corresponding number of TDM frames.
机译:包括多个基站(BS)的单频通信系统(例如DVB,NGH),每个基站包括OFDM发射机,该OFDM发射机包括:来自第一数据管道82的第一输入(例如国家电视传输);以及来自本地服务插入数据管道84的第二输入(例如本地电视传输);调制器,其使用来自第一数据管道y0y1y2y3的数据,使用低阶调制方案94(例如M-QAM),或来自第一数据管道和本地服务的数据,来调制OFDM符号的子载波信号使用更高阶的调制方案96(例如至少2M-QAM)插入数据管道h0h1。 BS的子集从第一数据管道和本地插入管道发送数据,而BS的另一个子集仅从第一数据管道发送数据。群集可以由预定数量的BS形成,每个BS被分配给对应数量的TDM帧之一。

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