US5745479A — Error detection in a wireless LAN environment

Claim 1

Independent Claim 87 words

An apparatus for detecting errors in a wireless communication channel, comprising: a receiver which receives a data stream from the wireless communication channel; a signal strength indication circuit coupled with the receiver which indicates signal strength for a received data stream; and processing resources, coupled with the signal strength indication circuit, which monitor the received data stream signal strength to detect anomalies in strength of the received data stream typical of erroneous data, and produce a receive data error signal in response to detected anomaly in strength.

Claim 2

Independent Claim 87 words

An apparatus for detecting errors in a wireless communication channel, comprising: a receiver which receives a data stream from the wireless communication channel; a signal strength indication circuit coupled with the receiver which indicates signal strength for a received data stream; and processing resources, coupled with the signal strength indication circuit, which monitor the received data stream signal strength to detect anomalies in strength of the received data stream typical of erroneous data, and produce a receive data error signal in response to detected anomaly in strength.

Claim 3

Dependent Claim 69 words

The apparatus of claim 1, further including a signal phase monitoring circuit coupled with the receiver which indicates phase of a received data stream; and processing resources, coupled with the signal phase monitoring circuit, which monitor the received data stream phase to detect anomalies in phase of the received data stream typical of erroneous data, and produce a receive data error signal in response to detected anomaly in phase.

Claim 4

Dependent Claim 43 words

The apparatus of claim 2, wherein the data stream includes data packets having error detection codes embedded in the data packets, and further including: processing resources coupled with the receiver responsive to the error detection codes to detect errors in the data packets.

Claim 5

Dependent Claim 70 words

The apparatus of claim 1, wherein the receiver includes: an antenna which receives RF energy in a communication band; a downconverter, coupled with the antenna, which converts the received data stream frequency down to a intermediate band; a filter, coupled to the downconverter, tuned for the intermediate band which outputs an intermediate band signal; and a detector, coupled to the filter, which produces recovered data from the intermediate band signal.

Claim 6

Dependent Claim 31 words

The apparatus of claim 4, wherein the signal strength indication circuit is coupled to the filter, and produces a signal strength indicator signal in response to the intermediate band signal strength.

Claim 7

Dependent Claim 25 words

The apparatus of claim 5, wherein the signal strength indication signal comprises a voltage which is logarithmically proportional to amplitude of the intermediate band signal.

Claim 8

Dependent Claim 18 words

The apparatus of claim 6, wherein the RF energy in the communication band comprises a frequency modulated signal.

Claim 9

Dependent Claim 15 words

The apparatus of claim 4, wherein the filter comprises a surface acoustic wave (SAW) filter.

Claim 10

Dependent Claim 132 words

The apparatus of claim 1, wherein the receiver includes: an antenna which receives RF energy in a communication band; a downconverter, coupled with the antenna, which converts the received RF energy frequency down to a intermediate band; a filter, coupled to the downconverter, tuned for the intermediate band which outputs an intermediate band signal; a detector, coupled to the filter, which produces an incoming data stream from the intermediate band signal; phase detection circuitry coupled to the detector which indicates phase of the incoming data stream; and processing resources, coupled with the phase detection circuitry, which monitors phase of the incoming data stream to detect anomalies in phase of the incoming data stream typical of erroneous data, and produce a receive data error signal in response to a detected anomaly in phase.

Claim 11

Dependent Claim 31 words

The apparatus of claim 9, wherein the signal strength indication circuit is coupled to the filter, and produces a signal strength indicator signal in response to the intermediate band signal strength.

Claim 12

Dependent Claim 44 words

The apparatus of claim 10, wherein the incoming data stream includes data packets having error detection codes embedded in the data packets, and further including: processing resources coupled with the detector responsive to the error detection codes to detect errors in the data packets.

Claim 13

Independent Claim 131 words

An apparatus for detecting errors in a network data packet transmitted in a wireless radio medium as an RF signal modulated in response to the network data packet, comprising: a receiver which receives the RF signal from the wireless radio medium; a demodulation circuitry which demodulates the RF signal to recover a serial data stream from the RF signal; a signal strength indication circuit, coupled with the demodulation circuitry, which indicates signal strength for a received RF signal; and processing resources, coupled with the signal strength indication circuit, which monitor the received signal strength of the RF signal to detect anomalies in strength of the RF signal typical of erroneous data in the serial data stream, and produce a receive data error signal in response to detected a anomaly in strength.

Claim 14

Independent Claim 131 words

An apparatus for detecting errors in a network data packet transmitted in a wireless radio medium as an RF signal modulated in response to the network data packet, comprising: a receiver which receives the RF signal from the wireless radio medium; a demodulation circuitry which demodulates the RF signal to recover a serial data stream from the RF signal; a signal strength indication circuit, coupled with the demodulation circuitry, which indicates signal strength for a received RF signal; and processing resources, coupled with the signal strength indication circuit, which monitor the received signal strength of the RF signal to detect anomalies in strength of the RF signal typical of erroneous data in the serial data stream, and produce a receive data error signal in response to detected a anomaly in strength.

Claim 15

Dependent Claim 73 words

The apparatus of claim 12, further including: a signal phase monitoring circuit coupled with the demodulation circuitry which indicates phase of transitions in the serial data stream; and processing resources, coupled with the signal phase monitoring circuit, which monitor the received data stream phase to detect anomalies in phase of the received data stream typical of erroneous data, and produce a receive data error signal in response to a detected anomaly in phase.

Claim 16

Dependent Claim 42 words

The apparatus of claim 13, wherein the network data packets having error detection codes embedded in the data packets, and further including: processing resources coupled with the demodulation circuitry responsive to the error detection codes to detect errors in the data packets.

Claim 17

Dependent Claim 78 words

The apparatus of claim 12, wherein the demodulation circuitry includes: an antenna which receives the RF signal having a frequency in a communication band; a downconverter, coupled with the antenna, which converts the frequency of the RF signal down to an intermediate band; a filter, coupled to the downconverter, tuned for the intermediate band which outputs an intermediate band signal; and a detector, coupled to the filter, which produces the serial data stream from the intermediate band signal.

Claim 18

Dependent Claim 32 words

The apparatus of claim 15, wherein the signal strength indication circuit is coupled to the filter, and produces a signal strength indicator signal in response to amplitude of the intermediate band signal.

Claim 19

Dependent Claim 137 words

The apparatus of claim 12, wherein the receiver includes: an antenna which receives the RF signal in a communication band; a downconverter, coupled with the antenna, which converts the received RF signal down from the communication band to an intermediate band; a filter, coupled to the downconverter, tuned for the intermediate band which outputs an intermediate band signal; a detector, coupled to the filter, which produces the received data stream from the intermediate band signal; phase detection circuitry coupled to the detector which indicates phase of transitions in the received data stream; and processing resources, coupled with the phase detection circuitry, which monitors phase of the received data stream to detect anomalies in phase of the received data stream typical of erroneous data, and produce a receive data error signal in response to detected anomaly in phase.

Claim 20

Dependent Claim 31 words

The apparatus of claim 17, wherein the signal strength indication circuit is coupled to the filter, and produces a signal strength indicator signal in response to the intermediate band signal amplitude.

Claim 21

Dependent Claim 15 words

The apparatus of claim 17, wherein the filter comprises a surface acoustic wave (SAW) filter.

Claim 22

Dependent Claim 25 words

The apparatus of claim 17, wherein the signal strength indication signal comprises a voltage which is logarithmically proportional to amplitude of the intermediate band signal.

Claim 23

Dependent Claim 21 words

The apparatus of claim 17, wherein the RF signal comprises a frequency modulated signal modulated by gaussian filtered minimum shift keying.

Claim 24

Independent Claim 231 words

An apparatus for detecting errors in a network data packet transmitted in a wireless radio medium as a frequency modulated RF signal modulated in response to the network data packet with a data rate of greater than one megabit per second, comprising: an antenna which receives the RF signal in a microwave communication band; a radio frequency (RF) amplifier tuned to the microwave communication band which receives the RF signal from the wireless radio medium; a downconverter, coupled with the RF amplifier, which converts the received RF signal from the communication band down to an intermediate band; a filter, coupled to the downconverter, tuned for the intermediate band which outputs an intermediate band signal; and a detector, coupled to the filter, which produces a serial data stream from the intermediate band signal; a signal strength indication circuit, coupled with the filter, which indicates signal strength for the intermediate band signal; a signal phase monitoring circuit coupled with the detector which indicates phase of transitions in the serial data stream; and processing resources, coupled with the signal strength indication circuit, which monitor the signal strength of the intermediate band signal and phase of transitions in the serial data stream to detect anomalies typical of erroneous data in the serial data stream, and produce a receive data error signal in response to a detected anomaly in strength or a detected anomaly in phase.

Claim 25

Independent Claim 231 words

An apparatus for detecting errors in a network data packet transmitted in a wireless radio medium as a frequency modulated RF signal modulated in response to the network data packet with a data rate of greater than one megabit per second, comprising: an antenna which receives the RF signal in a microwave communication band; a radio frequency (RF) amplifier tuned to the microwave communication band which receives the RF signal from the wireless radio medium; a downconverter, coupled with the RF amplifier, which converts the received RF signal from the communication band down to an intermediate band; a filter, coupled to the downconverter, tuned for the intermediate band which outputs an intermediate band signal; and a detector, coupled to the filter, which produces a serial data stream from the intermediate band signal; a signal strength indication circuit, coupled with the filter, which indicates signal strength for the intermediate band signal; a signal phase monitoring circuit coupled with the detector which indicates phase of transitions in the serial data stream; and processing resources, coupled with the signal strength indication circuit, which monitor the signal strength of the intermediate band signal and phase of transitions in the serial data stream to detect anomalies typical of erroneous data in the serial data stream, and produce a receive data error signal in response to a detected anomaly in strength or a detected anomaly in phase.

Claim 26

Dependent Claim 15 words

The apparatus of claim 22, wherein the serial data stream comprises analog non-return-to-zero (NRZ) data.

Claim 27

Dependent Claim 20 words

The apparatus of claim 23 wherein the analog NRZ data has a data rate of nominally 10 megabits per second.

Claim 28

Dependent Claim 50 words

The apparatus of claim 24, wherein the network data packets comprise an Ethernet packet, encapsulated in a wireless packet, the wireless packet having an error detection code, and further including: processing resources coupled with the detector responsive to the error detection code to detect errors in the Ethernet data packets.

Claim 29

Dependent Claim 15 words

The apparatus of claim 22, wherein the filter comprises a surface acoustic wave (SAW) filter.

Claim 30

Dependent Claim 28 words

The apparatus of claim 26, wherein the signal strength indication circuit produces a signal comprising a voltage which is logarithmically proportional to amplitude of the intermediate band signal.

Claim 31

Dependent Claim 19 words

The apparatus of claim 22, wherein the frequency modulated RF signal is modulated by gaussian filtered minimum shift keying.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-04-27	2001-10-27	2002-04-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-04-27	2005-10-27	2006-04-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-04-27	2009-10-27	2010-04-28	$7700.00	Window Closed / Lapsed

Error detection in a wireless LAN environment

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