Method and system for tiered digital television terrestrial...

Details Method and system for tiered digital television terrestrial... Method and system for tiered digital television terrestrial...

2005-09-13

2005-09-13

Chin, Wellington (Department: 2664)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S203000

Reexamination Certificate

active

06944120

ABSTRACT:
The invention relates to a method and system for tiered digital broadcasting. A plurality of different bit streams representing digital data targeted for different services is received from a data source. Each bit-stream of the plurality of different bit-streams is modulated on a plurality of OFDM sub-carriers. Sub-carriers of different bit streams have different spectral efficiency. The parallel OFDM sub-carriers of each bit-stream are frequency interleaved with the parallel OFDM sub-carriers of the other bit streams of the plurality of different bit streams such that the parallel OFDM sub-carriers of each bit are spread over an entire available frequency spectrum. The interleaved sub-carriers are transformed into time domain for providing a frequency interleaved OFDM signal. The OFDM signal is then upconverted to the frequency of a broadcasting channel and transmitted. The invention enables a broadcasting station to transmit multiple bit streams with different spectral efficiency using one RF channel.

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Yiyan Wu, Communications Research Centre, “Using Frequency Interleaved OFDM for Tiered Digital Television Terrestrial Broadcasting Services”, Mar. 16, 2000, Canada.

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