Interference rejection in wireless receivers
First Claim
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1. A method comprising:
- updating a noise variance estimate during the reception of a data portion of a packet in an orthogonal frequency division multiplexing (OFDM) receiver wherein the noise variance estimate include an average signal energy over multiple symbols in multiple OFDM tones;
determining whether a Bluetooth complaint device is co-located with the OFDM receiver through direct communication using a least one electrical conductor between the Bluetooth complaint device and the OFDM receiver; and
selecting an algorithm to re-estimate the noise variance based on whether a Bluetooth complaint device is co-located.
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Abstract
The effects of interference are mitigated in a wireless system through update noise variance estimates. Noise variance estimates may be update after the reception of a preamble in an OFDM receiver. Noise variance estimates may include averages of signal energy over multiple symbols in one OFDM tone and over multiple OFDM tones. A co-located wireless personal area network (WPAN) interface may signal its presence a wireless local area network (WLAN) interface, which may select a noise variance estimate algorithm based therein.
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Citations
12 Claims
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1. A method comprising:
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updating a noise variance estimate during the reception of a data portion of a packet in an orthogonal frequency division multiplexing (OFDM) receiver wherein the noise variance estimate include an average signal energy over multiple symbols in multiple OFDM tones; determining whether a Bluetooth complaint device is co-located with the OFDM receiver through direct communication using a least one electrical conductor between the Bluetooth complaint device and the OFDM receiver; and selecting an algorithm to re-estimate the noise variance based on whether a Bluetooth complaint device is co-located. - View Dependent Claims (2)
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3. A method comprising:
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updating a noise variance estimate during the reception of a data portion of a packet in an orthogonal frequency division multiplexing (OFDM) receiver wherein the noise variance estimate includes an average signal energy over multiple symbols in a single OFDM tone; determining whether a Bluetooth complaint device is co-located with the OFDM receiver through direct communication using a least one electrical conductor between the Bluetooth complaint device and the OFDM receiver; and selecting an algorithm to re-estimate the noise variance based on whether a Bluetooth complaint device is co-located.
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4. A method comprising:
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receiving a signal having a preamble in an orthogonal frequency division multiplexing (OFDM) system; estimating a noise variance for multiple frequency sub-carrier ion the OFDM system; receiving a signal having data in the OFDM system; determining whether a Bluetooth complaint device is co-located with the OFDM receiver through direct communication using a least one electrical conductor between the Bluetooth complaint device and the OFDM receiver; selecting an algorithm to re-estimate the noise variance based on whether a Bluetooth complaint device is co-located; and re-estimating the noise variance by averaging signal energy over multiple symbols in the multiple frequency sub-carrier. - View Dependent Claims (5, 6)
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- 7. An article comprising a machine-readable medium adapted to hold instructions that when accessed result in a machine determining whether Bluetooth complaint device is co-located with an OFDM receiver through direct communication using a least one electrical conductor between the Bluetooth complaint device and the OFDM receiver, continuously estimating a noise variance for each tone in a received OFDM signal wherein estimating a noise variance comprises averaging received signal energy over a plurality of received symbols in one OFDM tone, wherein estimating a noise variance comprises using a first method to estimate the noise variance when the Bluetooth interface is co-located with the OFDM receiver, and using a second method to estimate the noise variance when no Bluetooth interface id co-located with the OFDM receiver.
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9. An electronic system comprising:
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a wireless personal area network (WPAN) interface; a wireless local area network (WLAN) interface that utilizes orthogonal frequency division multiplexing (OFDM); and electrical conductor to form a signal path from the WPAN interface to the WLAN interface to indicate the presence of the WPAN interface in the electronic system; and a memory storage element to hold instructions that when accessed result in updating a noise variance for a received WLAN signal, wherein the noise variance describes the received WLAN signal for a time period other than a time during which a preamble is received. - View Dependent Claims (10, 11, 12)
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Specification