Method and system for communicating information in a digital signal
First Claim
1. A method for communicating a selected transmission parameter in a digital signal modulated according to a single carrier modulation technique and comprising distinct data symbols and pilot symbols, the method comprising:
- encoding the selected transmission parameter in a sequence characteristic of the pilot symbols distributed amongst the data symbols, the sequence characteristic being a function of the relative position of the individual pilot symbols assigned to positions interleaved amongst the data symbols;
wherein the sequence characteristic is one of a plurality of patterns, each pattern associated with at least one of a plurality of transmission parameters, the sequence characteristic being independent of the modulation technique,wherein the sequence characteristic is distributed across a plurality of packets that are synchronized in time but transmitted separately; and
wherein a receiver, upon receiving the digital signal, is able to determine the pattern of the sequence characteristic for the packets and thereby retrieve the selected transmission parameter.
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Abstract
The present invention relates to a communication method, system and signal, and in particular to a method and system for communicating information in a digital signal. It has particular application to satellite or terrestrial packet-based multi-user radio communication systems. A method for communicating information in a digital signal comprising data symbols is disclosed, wherein the information is encoded in a sequence characteristic of pilot symbols distributed amongst the data symbols, such that a receiver is able to determine the sequence characteristic and retrieve the transmitted information. The invention allows information to be encoded into a sequence characteristic of pilot symbols, rather than relying on modulating such information onto the pilot symbols themselves. This allows a significantly larger number of pieces of information to be transmitted than hitherto possible, and the technique is more resistant to large frequency errors than prior techniques.
452 Citations
19 Claims
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1. A method for communicating a selected transmission parameter in a digital signal modulated according to a single carrier modulation technique and comprising distinct data symbols and pilot symbols, the method comprising:
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encoding the selected transmission parameter in a sequence characteristic of the pilot symbols distributed amongst the data symbols, the sequence characteristic being a function of the relative position of the individual pilot symbols assigned to positions interleaved amongst the data symbols; wherein the sequence characteristic is one of a plurality of patterns, each pattern associated with at least one of a plurality of transmission parameters, the sequence characteristic being independent of the modulation technique, wherein the sequence characteristic is distributed across a plurality of packets that are synchronized in time but transmitted separately; and wherein a receiver, upon receiving the digital signal, is able to determine the pattern of the sequence characteristic for the packets and thereby retrieve the selected transmission parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for retrieving a selected transmission parameter in a digital signal, the method comprising:
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receiving a digital signal modulated according to a single carrier modulation technique, the digital signal including distinct pilot symbols and data symbols; determining a sequence characteristic of the pilot symbols distributed amongst the data symbols, the sequence characteristic being a function of the relative position of the individual pilot symbols assigned to positions interleaved amongst the data symbols; and retrieving the selected transmission parameter encoded in the pattern of the sequence characteristic; wherein the sequence characteristic is one of a plurality of patterns, each pattern associated with at least one of a plurality of transmission parameters, the sequence characteristic being independent of the modulation technique; and wherein the sequence characteristic is distributed across a plurality of packets that are synchronized in time but transmitted separately. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus, comprising:
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a processor configured for (i) selecting a transmission parameter, (ii) determining a sequence characteristic of the pilot symbols distributed amongst the data symbols, the sequence characteristic being a function of the relative position of the individual pilot symbols assigned to positions interleaved amongst the data symbols, (iii) encoding the selected transmission parameter in a sequence characteristic of the pilot symbols distributed amongst the data symbols, the sequence characteristic being a function of the relative position of the individual pilot symbols assigned to positions interleaved amongst the data symbols, and (iv) transmitting the encoded selected transmission parameter in a digital signal modulated according to a single carrier modulation technique and comprising distinct data symbols and pilot symbols; wherein the sequence characteristic is one of a plurality of patterns, each pattern associated with at least one of a plurality of transmission parameters, the sequence characteristic being independent of the modulation technique; and wherein the sequence characteristic is distributed across a plurality of packets that are synchronized in time but transmitted separately. - View Dependent Claims (17, 18, 19)
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Specification