CYCLICAL OBSTRUCTION COMMUNICATION SYSTEM
First Claim
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1. A method for transmitting data to remote terminals in a communication system, the method comprising:
- encoding a series of transmission packets destined for a remote terminal;
mapping the series of transmission packets to I/Q symbols;
interleaving the series of transmission packets;
inserting periodic unique transmission identifiers within the series of transmission packets following the interleaving of the series of transmission packets, such that each unique transmission identifier of the periodic unique transmission identifiers is associated with a portion of the series of transmission packets;
modulating and transmitting the series of transmission packets including the periodic unique transmission identifiers over a wireless channel;
receiving a series of received packets including received periodic unique identifiers at the remote terminal, wherein the series of received packets are associated with the series of transmission packets, and wherein the received periodic unique identifiers are associated with the periodic unique transmission identifiers;
correlating the received periodic unique identifiers with a copy of the periodic unique transmission identifiers stored at the remote terminal;
determining that the correlation is below a predetermined threshold for at least a portion of the periodic unique transmission identifiers;
removing the received periodic unique identifiers from the received series of packets; and
modifying operation of remote terminal for a portion of the series of received packets associated with the portion of the periodic unique transmission identifiers.
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Abstract
Techniques for improving data rates at mobile terminals that are subject to periodic channel interruptions in a beyond-line-of-sight communication system are disclosed, including improved encoding and decoding systems that identify blockages and modify receiver operation during blockages to reduce data errors. In certain embodiments, encoding, symbol mapping, interleaving, and use of unique periodic identifiers function to enable a series of packets that may be received in a blockage impaired channel with reduced errors.
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Citations
20 Claims
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1. A method for transmitting data to remote terminals in a communication system, the method comprising:
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encoding a series of transmission packets destined for a remote terminal; mapping the series of transmission packets to I/Q symbols; interleaving the series of transmission packets; inserting periodic unique transmission identifiers within the series of transmission packets following the interleaving of the series of transmission packets, such that each unique transmission identifier of the periodic unique transmission identifiers is associated with a portion of the series of transmission packets; modulating and transmitting the series of transmission packets including the periodic unique transmission identifiers over a wireless channel; receiving a series of received packets including received periodic unique identifiers at the remote terminal, wherein the series of received packets are associated with the series of transmission packets, and wherein the received periodic unique identifiers are associated with the periodic unique transmission identifiers; correlating the received periodic unique identifiers with a copy of the periodic unique transmission identifiers stored at the remote terminal; determining that the correlation is below a predetermined threshold for at least a portion of the periodic unique transmission identifiers; removing the received periodic unique identifiers from the received series of packets; and modifying operation of remote terminal for a portion of the series of received packets associated with the portion of the periodic unique transmission identifiers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A remote terminal including a receiver, the receiver comprising:
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a demodulator that receives a series of received packets including received periodic unique identifiers at the remote terminal from a blockage impaired channel, wherein the received periodic unique identifiers are spaced at predetermined positions within the series of received packets; a correlation data removal module comprising a memory module, wherein the correlation data removal module correlates the received periodic unique identifiers with a copy of the periodic unique transmission identifiers stored in the memory module and creates a signal blockage indicator when the correlation is below a predetermined threshold for at least a portion of the periodic unique transmission identifiers; a deinterleaver that implements a predetermined de-interleaving process on the series of received packets following removal of the correlation data; and a first decoder that decodes the series of received packets following the de-interleaving process. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for receiving data at a remote terminals in a communication system, the method comprising:
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receiving a series of received packets including received periodic unique identifiers at the remote terminal, wherein the received periodic unique identifiers are spaced at predetermined positions within the series of received packets; correlating the received periodic unique identifiers with a copy of the periodic unique transmission identifiers stored at the remote terminal; determining that the correlation is below a predetermined threshold for at least a portion of the periodic unique transmission identifiers; removing the received periodic unique identifiers from the received series of packets; and modifying operation of the remote terminal for a portion of the series of received packets associated with the portion of the periodic unique transmission identifiers. - View Dependent Claims (17, 18, 19, 20)
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Specification