Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
1999-12-16
2003-09-09
Vo, Nguyen T. (Department: 2685)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C375S260000, C714S756000
Reexamination Certificate
active
06618367
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates generally to communications and, more particularly, to satellite broadcast systems.
(2) Background Art
A proposed satellite digital audio radio system (SDARS) supports multiple audio and data program channels (program channels) for broadcasting CD-like music and talk shows to mobile and fixed receivers. Illustratively, the system provides for the transmission of 100 program channels.
Consequently, there is desired a transmission frame structure for efficient transport of these channels.
SUMMARY OF THE INVENTION
A transmission frame structure is presented for a satellite digital audio radio system (SDARS). In accordance with the invention, an SDARS transmitter processes N program channels into M clusters, each cluster representing k program channels, where M>1, N>M, and (k)(M)≦N. The SDARS transmitter further partitions each cluster into J cluster segments and interleaves the cluster segments from each cluster for transmission, where J>1.
In an embodiment of the invention, an SDARS transmitter provides a broadcast transmission signal including a time division multiplex (TDM) mode of transmission and a coded orthogonal frequency multiplex (OFDM) mode of transmission. The SDARS transmitter provides a transmission signal that supports four transport mechanisms or traffic channels: (1) multiple audio and data program channels (program channels), (2) a cluster control information channel (CC), (3) a global control information channel (GC), and (4) a cluster synchronization channel (CS). In particular, the SDARS transmitter processes 100 program channels into 5 clusters, each cluster comprising GC and CS information, along with a program cluster comprising 20 program channels and CC information. The SDARS transmitter further partitions each cluster into 255 cluster segments and interleaves the cluster segments from each cluster for transmission.
REFERENCES:
patent: 5612742 (1997-03-01), Krause et al.
patent: 5914933 (1999-06-01), Cimini et al.
patent: 6154452 (2000-11-01), Marko et al.
patent: 2002/0163879 (2002-11-01), Li et al.
patent: 2256733 (1997-12-01), None
Riazi Habib
Sayeed Zulfiquar
Zheng Dunmin
Agere Systems Inc.
Vo Nguyen T.
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