LINK ADAPTATION BASED ON GENERIC CINR MEASUREMENT ACCORDING TO LOG-LIKELIHOOD RATIO DISTRIBUTION
First Claim
1. A method comprising:
- receiving at a first device a wireless transmission transmitted from a second device;
generating log-likelihood ratio data from the received wireless transmission;
computing a carrier to interference plus noise ratio (CINR) based on the log-likelihood ratio data; and
adjusting a modulation and/or coding parameter associated with the wireless transmission based on the CINR.
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Accused Products
Abstract
Techniques are provided to compute the carrier to interference-plus-noise ratio (CINR) in a wireless communication system using log-likelihood ratio (LLR) data generated from a received transmission. The LLR data are collected as they are sent from a detector to a forward error correction (FEC) decoder in a wireless communications device. In one embodiment, decision-aided LLR based CINR is computed using the decoded bits output from the FEC decoder as feedback. In another embodiment, blind LLR based CINR is computed without feedback. The CINR may be used to adjust a modulation and/or coding parameters associated with wireless communication between wireless communication devices.
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Citations
27 Claims
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1. A method comprising:
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receiving at a first device a wireless transmission transmitted from a second device; generating log-likelihood ratio data from the received wireless transmission; computing a carrier to interference plus noise ratio (CINR) based on the log-likelihood ratio data; and adjusting a modulation and/or coding parameter associated with the wireless transmission based on the CINR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a receiver that receives a wireless transmission transmitted from a second communication apparatus; a detector coupled to the receiver and configured to generate log-likelihood ratio data from the received wireless transmission; and a controller coupled to the detector and configured to; compute a carrier to interference plus noise ratio (CINR) based on the log-likelihood ratio data; and generate adjustment data for a modulation and/or coding parameter associated with the wireless transmission based on the CINR. - View Dependent Claims (17, 18, 19, 20, 21)
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22. Logic encoded in one or more tangible media for execution and when executed operable to:
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generate log-likelihood ratio data associated with reception of a wireless transmission at a first device that is transmitted from a second device; compute a carrier to interference plus noise ratio (CINR) based on the log-likelihood ratio data; and adjust a modulation and/or coding parameter associated with the wireless transmission based on the CINR. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification