Multiplex communications – Wide area network – Packet switching
Patent
1987-11-05
1989-08-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370104, H04J 306
Patent
active
048582255
ABSTRACT:
Reconfigurable switching router connects to an existing connectivity network on board a multibeam communications satellite for increasing the flexibility thereof by providing variable bandwidth capability so that the satellite handles a multitude of individual users having different requirements of bandwidth and transmission rates. The bandwidth of at least one transponder channel is split into two portions. A first portion provides a VBVCF continuous passband while a second portion is further channelized in a reconfigurable fashion to achieve VBVCF subchannelization. The reconfigurable switching router utilizes a class of multi-level channelization formats implemented by a plurality of filter banks connected in parallel. A switching network performs VBVCF subchannel selection and routing via time and/or frequency multiplexing thereby to accommodate both VBVCF SSTDMA and SSFDMA traffic.
REFERENCES:
patent: 3548108 (1970-12-01), Yamato et al.
patent: 4144495 (1979-03-01), Metzger
patent: 4228401 (1980-10-01), Wachs et al.
patent: 4706239 (1987-11-01), Ito et al.
"Non-Regenerative Satellite-Switched FDMA Payload Technologies" by deSantis, Intelsat Technical Memorandum, Sep. 1986.
"Properties of a Constant-k Ladder SAW Contiguous Filter Bank" by Webb, IEEE Transactions on Sonics and Ultrasonics, vol. SU23, No. 6, Nov. 1976.
"Filter with Bandwidth Continuously Variable from 5-100 mhz" by Melngailis et al, 1977, Ultransonics Symposium Proceedings, IEEE Catalog #77CH1264-1SU.
"A Comparison of Frequency Domain Multiple Access and Time Domain Multiple Access Approaches to Satellite . . . ", NASA Technical Memo 83430 by Stevens, Jun. 1983.
"Study of Advanced Communications Satellite Systems Based on SS-FDMA" by Kiesling, General Electric Space Division, May 1980.
International Telecommunications Satellite
Marcelo Melvin
Olms Douglas W.
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