Adaptively determining a data rate of packetized information transmission over a wireless channel
First Claim
1. A method comprising:
- operating multiple transmit antennas and multiple receive antennas to transmit and receive data over a wireless channel for multiple-in-multiple-out (MIMO) wireless communications;
adaptively determining a data rate of packetized information transmission over the wireless channel based on both a signal quality measure of multiple received signals and a channel quality measure derived from the multiple received signals, the channel quality measure being indicative of frequency selectivity in the wireless channel, wherein the multiple received signals are respectively received by the multiple receive antennas; and
transmitting the packetized information over the wireless channel in accordance with the data rate,wherein said adaptively determining comprises using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate,wherein using the signal quality measure comprises selecting an original rate based on the signal quality measure and one or more signal quality thresholds, and using the channel quality measure comprises adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed.
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Abstract
Systems and techniques relating to processing a signal received over a wireless channel. A technique includes adaptively determining a data rate of packetized information transmission based on both a signal quality measure of a received signal and a channel quality measure derived from the received signal, the channel quality measure being indicative of frequency selectivity in the wireless channel. An apparatus includes a channel estimator configured to be responsive to a received OFDM signal corresponding to multiple frequency tones of the channel, and configured to evaluate channel response characteristics of the frequency tones; and a channel state indicator configured to generate a channel quality measure usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission, wherein the channel quality measure is generated from the channel response characteristics of the frequency tones and is indicative of frequency selectivity in the wireless channel.
70 Citations
67 Claims
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1. A method comprising:
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operating multiple transmit antennas and multiple receive antennas to transmit and receive data over a wireless channel for multiple-in-multiple-out (MIMO) wireless communications; adaptively determining a data rate of packetized information transmission over the wireless channel based on both a signal quality measure of multiple received signals and a channel quality measure derived from the multiple received signals, the channel quality measure being indicative of frequency selectivity in the wireless channel, wherein the multiple received signals are respectively received by the multiple receive antennas; and transmitting the packetized information over the wireless channel in accordance with the data rate, wherein said adaptively determining comprises using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate, wherein using the signal quality measure comprises selecting an original rate based on the signal quality measure and one or more signal quality thresholds, and using the channel quality measure comprises adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A machine-readable medium embodying a program operable to cause one or more machines to perform operations comprising:
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adaptively determining a data rate of packetized information transmission over a wireless channel based on both a signal quality measure of multiple received signals and a channel quality measure derived from the multiple received signals, the channel quality measure being indicative of frequency selectivity in the wireless channel, wherein the multiple received signals are respectively received by multiple receive antennas configured for multiple-in-multiple-out (MIMO) wireless communications, wherein said adaptively determining comprises using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate, wherein using the signal quality measure comprises selecting an original rate based on the signal quality measure and one or more signal quality thresholds, and using the channel quality measure comprises adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus comprising:
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multiple transmit antennas and multiple receive antennas to transmit and receive data over a wireless channel for multiple-in-multiple-out (MIMO) wireless communications; a channel estimator, communicatively coupled with at least a portion of the multiple antennas, configured to be responsive to multiple signals received over the wireless channel, the received signals comprise an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones of the wireless channel, and configured to evaluate channel response characteristics of the frequency tones, wherein the multiple received signals are respectively received by the multiple receive antennas; and a channel state indicator responsive to output of the channel estimator and configured to generate a channel quality measure usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the channel quality measure is generated from the channel response characteristics of the frequency tones and is indicative of frequency selectivity in the wireless channel; and a rate controller that adaptively determines the data rate using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate, wherein the rate controller is configured to select an original rate based on the signal quality measure and one or more signal quality thresholds, and the rate controller is further configured to adjust the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. An apparatus comprising:
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means for operating multiple transmit antennas and multiple receive antennas to transmit and receive data over a wireless channel for multiple-in-multiple-out (MIMO) wireless communications; means for evaluating channel response characteristics of frequency tones of the wireless channel, over which multiple orthogonal frequency division multiplexed (OFDM) signals are respectively received by the multiple receive antennas, based on the received signals; means for generating a channel quality measure from the channel response characteristics of the frequency tones, the channel quality measure being indicative of frequency selectivity in the wireless channel, and the channel quality measure being usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, and means for adaptively determining the data rate using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate, wherein the means for adaptively determining comprises means for selecting an original rate based on the signal quality measure and one or more signal quality thresholds, and the means for adaptively determining comprises means for adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A system comprising:
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a transceiver including a physical (PHY) component and a media access control (MAC) component, wherein the transceiver further includes multiple transmit antennas and multiple receive antennas to transmit and receive data over a wireless channel for multiple-in-multiple-out (MIMO) wireless communications; a channel estimator included in the PHY component and configured to be responsive to multiple signals received over the wireless channel, the received signals comprise an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones of the wireless channel, and configured to evaluate channel response characteristics of the frequency tones, wherein the multiple received signals are respectively received by the multiple receive antennas; a channel state indicator responsive to output of the channel estimator and configured to generate a channel quality measure to be used along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the channel quality measure is generated from the channel response characteristics of the frequency tones and is indicative of frequency selectivity in the wireless channel; and a rate controller that adaptively determines the data rate using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate, wherein the rate controller is configured to select an original rate based on the signal quality measure and one or more signal quality thresholds, and the rate controller is further configured to adjust the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. A system comprising:
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means for communicating over a wireless channel, including means for interfacing with the wireless channel and means for controlling access to the wireless channel through the means for interfacing and means for operating multiple transmit antennas and multiple receive antennas to transmit and receive data over the wireless channel for multiple-in-multiple-out (MIMO) wireless communications; means for evaluating channel response characteristics of frequency tones of the wireless channel, over which orthogonal frequency division multiplexed (OFDM) signals are respectively received by the multiple receive antennas, based on the received signals, the means for evaluating being included in the means for interfacing; means for generating a channel quality measure from the channel response characteristics of the frequency tones, the channel quality measure being indicative of frequency selectivity in the wireless channel, and the channel quality measure being usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel; and means for adaptively determining the data rate using the signal quality measure as a first level determinant of the data rate and using the channel quality measure as a second level determinant of the data rate, wherein the means for adaptively determining comprises means for selecting an original rate based on the signal quality measure and one or more signal quality thresholds, and the means for adaptively determining comprises means for adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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47. A method comprising:
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receiving a signal over a wireless channel, wherein the wireless channel comprises a radio frequency channel, and the received signal comprises an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones that make up the radio frequency channel; adaptively determining a data rate of packetized information transmission over the wireless channel based on both a signal quality measure of the received signal and a channel quality measure derived from the received signal, the channel quality measure being indicative of frequency selectivity in the wireless channel, wherein the adaptively determining further comprises; estimating channel response characteristics of the frequency tones; deriving the channel quality measure from the estimated channel response characteristics of the frequency tones; using the signal quality measure as a first level determinant of the adaptively determined data rate by at least selecting an original rate based on the signal quality measure and multiple signal quality thresholds; and using the channel quality measure as a second level determinant of the adaptively determined data rate by at least adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed; and transmitting the packetized information over the wireless channel in accordance with the adaptively determined data rate. - View Dependent Claims (48, 49, 50, 51)
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52. An apparatus comprising:
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a channel estimator configured to be responsive to a signal received over a wireless channel, the received signal comprising an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones of the wireless channel, and configured to evaluate channel response characteristics of the frequency tones; and a channel state indicator responsive to output of the channel estimator and configured to generate a channel quality measure usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the channel quality measure is generated from the channel response characteristics of the frequency tones and is indicative of frequency selectivity in the wireless channel, wherein adaptively determining the data rate comprises; using the signal quality measure as a first level determinant of the adaptively determined data rate by at least selecting an original rate based on the signal quality measure and multiple signal quality thresholds; and using the channel quality measure as a second level determinant of the adaptively determined data rate by at least adjusting the original rate if the signal quality measure falls within a tolerance range of a signal quality threshold and if the channel quality measure indicates an adjustment is needed. - View Dependent Claims (53)
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54. A machine-readable medium embodying a program operable to cause one or more machines to perform operations comprising:
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adaptively determining a data rate of packetized information transmission over a wireless channel based on both a signal quality measure of a received signal and a channel quality measure derived from the received signal, the channel quality measure being indicative of frequency selectivity in the wireless channel, wherein the wireless channel comprises a radio frequency channel, and the received signals comprise an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones that make up the radio frequency channel; estimating channel response characteristics of the frequency tones; and deriving the channel quality measure from the estimated channel response characteristics of the frequency tones, wherein deriving the channel quality measure comprises calculating a frequency selectivity measure for single-in-single-out (SISO) OFDM wireless communications, the frequency selectivity measure (FSM) being expressible in decibel (dB) scale as FSMSISO-dB=(10/N)Σ
k log10(|Hk|2), where N is a number of the frequency tones, k is a tone index, and Hk is a complex valued channel gain of the radio frequency channel. - View Dependent Claims (55)
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56. An apparatus comprising:
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a channel estimator configured to be responsive to a signal received over a wireless channel, the received signal comprising an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones of the wireless channel, and configured to evaluate channel response characteristics of the frequency tones; and a channel state indicator responsive to output of the channel estimator and configured to generate a channel quality measure usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the channel quality measure is generated from the channel response characteristics of the frequency tones and is indicative of frequency selectivity in the wireless channel, wherein the channel state indicator is further configured to generate the channel quality measure comprising a frequency selectivity measure for single-in-single-out (SISO) OFDM wireless communications, the frequency selectivity measure (FSM) being expressible in decibel (dB) scale as FSMSISO-dB=(10/N)Σ
k log10(|Hk|2), where N is a number of the frequency tones, k is a tone index, and Hk is a complex valued channel gain of the wireless channel. - View Dependent Claims (57, 58)
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59. An apparatus comprising:
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means for evaluating channel response characteristics of frequency tones of a wireless channel, over which an orthogonal frequency division multiplexed (OFDM) signal is received, based on the received signal; and means for generating a channel quality measure from the channel response characteristics of the frequency tones, the channel quality measure being indicative of frequency selectivity in the wireless channel, and the channel quality measure being usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the means for generating comprises means for generating the channel quality measure comprising a frequency selectivity measure for single-in-single-out (SISO) OFDM wireless communications, the frequency selectivity measure (FSM) being expressible in decibel (dB) scale as FSMSISO-dB=(10/N)Σ
k log10(|Hk|2), where N is a number of the frequency tones, k is a tone index, and Hk is a complex valued channel gain of the wireless channel. - View Dependent Claims (60, 61)
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62. A system comprising:
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a transceiver including a physical (PHY) component and a media access control (MAC) component; a channel estimator included in the PHY component and configured to be responsive to a signal received over a wireless channel, the received signal comprising an orthogonal frequency division multiplexed (OFDM) signal corresponding to multiple frequency tones of the wireless channel, and configured to evaluate channel response characteristics of the frequency tones; and a channel state indicator responsive to output of the channel estimator and configured to generate a channel quality measure to be used along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the channel quality measure is generated from the channel response characteristics of the frequency tones and is indicative of frequency selectivity in the wireless channel, wherein the channel state indicator is further configured to generate the channel quality measure comprising a frequency selectivity measure for single-in-single-out (SISO) OFDM wireless communications, the frequency selectivity measure (FSM) being expressible in decibel (dB) scale as FSMSISO-dB=(10/N)Σ
k log10(|Hk|2), where N is a number of the frequency tones, k is a tone index, and Hk is a complex valued channel gain of the wireless channel. - View Dependent Claims (63, 64)
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65. A system comprising:
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means for communicating over a wireless channel, including means for interfacing with the wireless channel and means for controlling access to the wireless channel through the means for interfacing; means for evaluating channel response characteristics of frequency tones of the wireless channel, over which an orthogonal frequency division multiplexed (OFDM) signal is received, based on the received signal, the means for evaluating being included in the means for interfacing; and means for generating a channel quality measure from the channel response characteristics of the frequency tones, the channel quality measure being indicative of frequency selectivity in the wireless channel, and the channel quality measure being usable along with a signal quality measure in adaptively determining a data rate of packetized information transmission over the wireless channel, wherein the means for generating comprises means for generating the channel quality measure comprising a frequency selectivity measure for single-in-single-out (SISO) OFDM wireless communications, the frequency selectivity measure (FSM) being expressible in decibel (dB) scale as FSMSISO-dB=(10/N)Σ
k log10(|Hk|2), where N is a number of the frequency tones, k is a tone index, and Hk is a complex valued channel gain of the wireless channel. - View Dependent Claims (66, 67)
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Specification