H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/185 (2006.01) H04B 1/12 (2006.01) H04L 1/00 (2006.01)
Patent
CA 2300672
The present invention provides a method and apparatus for mitigation of false co-channel uplink reception, also known as show-thru. The method includes the steps of selecting a scrambling sequence A and selecting a scrambling sequence B differing from the scrambling sequence A. The method then applies (408) the scrambling sequence A to uplink A data to form scrambled uplink A data and applies (410) the scrambling sequence B to uplink B data to form scrambled uplink B data. The uplink A data and the uplink B data are thereby differentiated and have vastly improved resistance to show-thru. The scrambled uplink A data and the scrambled uplink B data are then transmitted (412, 414) to a receiver, for example, onboard a satellite. The also codes (404, 406) the uplink A data and the uplink B data prior to scrambling. The coding (404, 406), in general, applies an error correcting code capable of correcting T errors. The method is generally applicable to numerous same color uplink beams in a coverage area. In applying the scrambling sequences to the uplink data, the method may use an exclusive-or operation. In applying the coding, the method may use a Reed-Solomon code, and in particular a (236, 212) Reed-Solomon code (T=12) particularly suitable for 53-byte Asynchronous Transfer Mode (ATM) cells. No extra uplink data is added with the exclusive-or operation and only a minimal additional processing step is used before transmission. Furthermore, the method is compatible with established error correcting coding techniques, for example, Reed-Solomon decoding.
Caso Gregory S.
Linsky Stuart T.
Wilcoxson Donald C.
Wright David A.
Gowling Lafleur Henderson Llp
Northrop Grumman Corporation
Trw Inc.
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