Method for estimating carrier-to-noise-plus-interference ratio (CNIR) for OFDM waveforms and the use thereof for diversity antenna branch selection
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United States of America Patent
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app pub date -
Nov 26, 2001
filing date -
Mar 6, 2001
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Abandoned
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Abstract
A scheme for estimating the carrier-to-noise-plus-interference ratio (CNIR) for Orthogonal Frequency-Division Multiplexing (OFDM) waveforms makes use of a physical waveform frame structure including a diversity selection portion. The diversity selection portion may be located at the end of a burst as a postamble and includes one or more OFDM symbols each having a frequency bin structure including both non-zero and zero OFDM frequency bin content. A first set of measurements are taken from an antenna branch on the non-zero OFDM frequency bins, and a second set of measurements are taken from the antenna branch on the zero OFDM frequency bins. An estimate for CNIR for at least one of the non-zero OFDM frequency bins and at least one of the zero OFDM frequency bins of the antenna branch is then computed using the first and second set of measurements.
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