System and method for adaptive modulation
First Claim
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1. An orthogonal frequency division multiplexing (OFDM) modulation method comprising:
- generating, by a wireless station, a symbol using a selected one of a plurality of modulation techniques;
embedding, by the wireless station, a plurality of pilot signals distributed throughout the symbol at predetermined intervals; and
encoding, by the wireless station, the pilot signals such that a combination of pilot signals uniquely identifies the selected one of the plurality of modulation techniques.
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Abstract
A wireless communication system is configured for adaptive modulation of a transmitted symbol. The specific modulation and/or coding is uniquely identified and data related thereto is embedded within the transmitted symbol. A receiver extracts pilot signals form the transmitted symbol and performs a correlation analysis to identify the particular modulation/coding used for that particular transmitted symbol. This permits adaptive modulation on a symbol-by-symbol basis. A base station communicating with a plurality of peripheral subscribers may utilize different modulation/coding for each subscriber depending on channel conditions.
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Citations
39 Claims
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1. An orthogonal frequency division multiplexing (OFDM) modulation method comprising:
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generating, by a wireless station, a symbol using a selected one of a plurality of modulation techniques; embedding, by the wireless station, a plurality of pilot signals distributed throughout the symbol at predetermined intervals; and encoding, by the wireless station, the pilot signals such that a combination of pilot signals uniquely identifies the selected one of the plurality of modulation techniques. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for identifying a modulation type for a received symbol, the method comprising:
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analyzing, by a wireless station, the symbol to identify a plurality of pilot signals embedded within the symbol;
analyzing the pilot signals; andon the basis of the pilot signal analysis, uniquely identifying, by the wireless station, the modulation type for the received symbol. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A modulation system comprising:
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a modulation selection processor to select a modulation type selected from a plurality of modulation types; and a modulator to modulate data and thereby generate a symbol for transmission, the modulator configured to embed a plurality of pilot signals throughout the symbol at predetermined intervals, wherein the pilot signals are encoded such that a combination of pilot signals uniquely identifies the selected one of the plurality of modulation techniques. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for generating a modulated symbol wherein the symbol is modulated using a selected one of a plurality of modulation types, the method comprising:
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generating, by a wireless station, a plurality of tones indicative of data; and distributing, by the wireless station, a plurality of pilot signals throughout the symbol at predetermined intervals, wherein the pilot signals are encoded such that a combination of pilot signals uniquely identifies the selected one of the plurality of modulation types. - View Dependent Claims (30, 31, 32)
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33. An apparatus for identifying a modulation type, comprising:
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a receiver to receive a symbol; and a pilot analysis circuit configured to analyze the symbol to identify a plurality of pilot signals embedded therein, to analyze the pilot signals, and to uniquely identify the modulation type for the received symbol on the basis of the pilot signal analysis. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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Specification