SYSTEM PHYSICAL LAYER PIPE FOR A DIGITAL TELEVISION SYSTEM

摘要

Methods and apparatuses are provided for transmitters and receivers for conveying and retrieving important system information carried in a multi-carrier modulation system for which the data stream is organized in multiple physical layer pipes (PLP). This is particularly important when broadcasters share the same physical channel. In one aspect of the present principles this is accomplished by assigning a PLP as a system PLP. The system PLP will carry information such as the mapping between a broadcaster and its PLPs and special messages like the Emergency Alert System and Amber Alert messages. In another aspect of the present principles, this information is carried in signaling data of the signal, instead of a PLP. In yet another aspect of the present principles, this is accomplished by a signaling parameter, which identifies the broadcaster associated with each PLP.

主权项

1. An apparatus for transmitting a multi-carrier modulated signal on a physical channel, said apparatus comprising:
a source that provides data, said data comprising
a broadcaster table identifying a plurality of broadcasters which are sharing said physical channel anda plurality of physical layer pipes (PLP) belonging to said plurality of broadcasters, wherein each physical layer pipe represents a virtual channel or service; and a multi-carrier modulator that modulates said data by allocating said data to a plurality of carriers of said physical channel in a plurality of modulation symbols.