Enhancing WLAN performance in the presence of interference
First Claim
1. A method for communications over a wireless local area network, the method comprising:
- receiving at a wireless access point signals transmitted from client devices and signals transmitted from interfering devices, wherein the receiving coherently uses multiple antennas connected to a common local oscillator, wherein the receiving of the signals transmitted from the interfering devices is performed when no signals are transmitted from the client devices;
measuring at the wireless access point from the received signals transmitted from the interfering devices at the wireless access point noise and interference capture samples;
computing at the wireless access point from the measured noise and interference capture samples a characterization of noise plus interference due to the interfering devices;
adjusting at the wireless access point receive gains and threshold levels based on the computed noise plus interference characterization;
calculating at the wireless access point from the measured noise and interference capture samples a set of weights for an interference suppression spatial filter;
spatially filtering at the wireless access point the received signals transmitted from the client devices using the calculated weights to produce a filtered signal, such that interference from the interfering devices is spatially nulled in the filtered signal; and
adjusting at the wireless access point a correlation detection threshold based on the computed noise plus interference characterization.
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Abstract
A wireless access point coherently receives signals transmitted from client devices and from interfering devices, measures noise and interference capture samples from the received signals, and computes a characterization of noise plus interference. Receive gains and threshold levels are adjusted based on the computed noise plus interference characterization. A set of weights for an interference suppression spatial filter are calculated from the measured noise and interference capture samples and used to produce a filtered signal by spatially filtering the received signals such that interference is spatially nulled in the filtered signal. The method may also include setting PHY parameters at the wireless access point based on the computed noise plus interference characterization. In some embodiments, a protection transmission is transmitted from the wireless access point, requesting connected client devices to suspend transmissions during a specified time period.
38 Citations
11 Claims
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1. A method for communications over a wireless local area network, the method comprising:
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receiving at a wireless access point signals transmitted from client devices and signals transmitted from interfering devices, wherein the receiving coherently uses multiple antennas connected to a common local oscillator, wherein the receiving of the signals transmitted from the interfering devices is performed when no signals are transmitted from the client devices; measuring at the wireless access point from the received signals transmitted from the interfering devices at the wireless access point noise and interference capture samples; computing at the wireless access point from the measured noise and interference capture samples a characterization of noise plus interference due to the interfering devices; adjusting at the wireless access point receive gains and threshold levels based on the computed noise plus interference characterization; calculating at the wireless access point from the measured noise and interference capture samples a set of weights for an interference suppression spatial filter; spatially filtering at the wireless access point the received signals transmitted from the client devices using the calculated weights to produce a filtered signal, such that interference from the interfering devices is spatially nulled in the filtered signal; and adjusting at the wireless access point a correlation detection threshold based on the computed noise plus interference characterization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification
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- Resources
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Current AssigneeWavion limited (Alvarion Limited)
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Original AssigneeWavion limited (Alvarion Limited)
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InventorsLevitan, Evgeny, Aviram, Aviv, Wax, Mati, Tweg, Reuven, STEINER, Avi, Leizerovich, Hanan
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Primary Examiner(s)Yao, Kwang B
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Assistant Examiner(s)Liu, Jung-Jen
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Application NumberUS12/657,549Publication NumberTime in Patent Office1,006 DaysField of Search370/203, 370204-215, 370229-253, 370310-337, 370338-350, 370/395.1, 370/395.3, 370/395.4, 370/395.41, 370/395.42, 370/395.5, 370/395.52, 370412-421, 370431-529US Class Current370/338CPC Class CodesH04B 17/345 Interference values signal-...
