US5822380A — Apparatus and method for joint channel estimation

Claim 1

Independent Claim 152 words

An apparatus for estimating channel tap coefficients for a first receive channel, comprising: first receiving means for receiving a first received sample stream corresponding to the first receive channel; second receiving means for receiving a second received sample stream corresponding to a second receive channel; and means for generating a set of estimated channel tap coefficients for the first receive channel as a function of the first received sample stream and the second received sample stream, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 2

Independent Claim 152 words

An apparatus for estimating channel tap coefficients for a first receive channel, comprising: first receiving means for receiving a first received sample stream corresponding to the first receive channel; second receiving means for receiving a second received sample stream corresponding to a second receive channel; and means for generating a set of estimated channel tap coefficients for the first receive channel as a function of the first received sample stream and the second received sample stream, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 3

Dependent Claim 138 words

The apparatus of claim 1, wherein said means for generating channel tap coefficients further includes: a first filter for generating a first expected received sample stream corresponding to the first receive channel as a function of information symbol values; a second filter for generating a second expected received sample stream corresponding to the second receive channel as a function of information symbol values; a first adder, coupled to said first filter and said first receiving means, for generating the first initial error sample stream as a function of the first expected received sample stream and the first received sample stream; and a second adder, coupled to said second filter and said second receiving means, for generating the second initial error sample stream as a function of the second expected received sample stream and the second received sample stream.

Claim 4

Dependent Claim 35 words

The apparatus of claim 1, wherein said producing means produces the first refined error sample stream by forming a linear combination including the first initial error sample stream and the second initial error sample stream.

Claim 5

Dependent Claim 44 words

The apparatus of claim 1, wherein said means for generating channel tap coefficients further includes a channel update unit for generating a first set of channel tap coefficients corresponding to the first receive channel as a function of the first refined error sample stream.

Claim 6

Dependent Claim 62 words

The apparatus of claim 1, wherein said means for generating channel tap coefficients further includes an impairment correlation estimator for generating an impairment correlation matrix, said impairment correlation matrix having at least two inputs and an output, wherein said at least two inputs are coupled respectively to said first and second receiving means and said output is connected to said producing means.

Claim 7

Dependent Claim 26 words

The apparatus of claim 5, wherein said producing means produces the first refined error sample stream by forming a linear combination including the impairment correlation matrix.

Claim 8

Dependent Claim 17 words

The apparatus of claim 1, wherein said means for generating channel tap coefficients comprises a Kalman filter.

Claim 9

Dependent Claim 181 words

A baseband processor for processing signals received over a first receive channel and a second receive channel, comprising: first receiving means for receiving a first received sample stream corresponding to the first receive channel; second receiving means for receiving a second received sample stream corresponding to the second receive channel; means for generating a set of estimated channel tap coefficients for at least one of the receive channels as a function of the first received sample stream and the second received sample stream; and a coherent detector coupled to said first and second sample stream receiving means and said means for generating channel tap coefficients, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 10

Dependent Claim 181 words

A baseband processor for processing signals received over a first receive channel and a second receive channel, comprising: first receiving means for receiving a first received sample stream corresponding to the first receive channel; second receiving means for receiving a second received sample stream corresponding to the second receive channel; means for generating a set of estimated channel tap coefficients for at least one of the receive channels as a function of the first received sample stream and the second received sample stream; and a coherent detector coupled to said first and second sample stream receiving means and said means for generating channel tap coefficients, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 11

Dependent Claim 139 words

The baseband processor of claim 8, wherein said means for generating channel tap coefficients further includes: a first filter for generating a first expected received sample stream corresponding to the first receive channel as a function of information symbol values; a second filter for generating a second expected received sample stream corresponding to the second receive channel as a function of information symbol values; a first adder, coupled to said first filter and said first receiving means, for generating the first initial error sample stream as a function of the first expected received sample stream and the first received sample stream; and a second adder, coupled to said second filter and said second receiving means, for generating the second initial error sample stream as a function of the second expected received sample stream and the second received sample stream.

Claim 12

Dependent Claim 36 words

The baseband processor of claim 8, wherein said producing means produces the first refined error sample stream by forming a linear combination including the first initial error sample stream and the second initial error sample stream.

Claim 13

Dependent Claim 44 words

The baseband processor of claim 8, wherein said means for generating channel tap coefficients includes a channel update unit for generating a first set of channel tap coefficients corresponding to the first receive channel as a function of the first refined error sample stream.

Claim 14

Dependent Claim 59 words

The baseband processor of claim 8, further including an impairment correlation estimator for generating an impairment correlation matrix, said impairment correlation matrix having at least two inputs and an output, wherein said at least two inputs are coupled respectively to said first and second receiving means and said output is connected to said producing means and said coherent detector.

Claim 15

Dependent Claim 27 words

The baseband processor of claim 12, wherein the producing means produces the first refined error sample stream by forming a linear combination including the impairment correlation matrix.

Claim 16

Dependent Claim 18 words

The baseband processor of claim 8, wherein said means for generating channel tap coefficients comprises a Kalman filter.

Claim 17

Dependent Claim 177 words

A radio receiver having a first receive channel and a second receive channel comprising: a first radio unit which outputs a first received sample stream corresponding to the first receive channel; a second radio unit which outputs a second received sample stream corresponding to the second receive channel; means for generating a set of estimated channel tap coefficients for at least one of the receive channels as a function of the first received sample stream and the second received sample stream; and a coherent detector coupled to said first and second radio units and said means for generating channel tap coefficients, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 18

Dependent Claim 177 words

A radio receiver having a first receive channel and a second receive channel comprising: a first radio unit which outputs a first received sample stream corresponding to the first receive channel; a second radio unit which outputs a second received sample stream corresponding to the second receive channel; means for generating a set of estimated channel tap coefficients for at least one of the receive channels as a function of the first received sample stream and the second received sample stream; and a coherent detector coupled to said first and second radio units and said means for generating channel tap coefficients, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 19

Dependent Claim 137 words

The receiver of claim 15, wherein said means for generating channel tap coefficients includes: a first filter for generating a first expected received sample stream corresponding to the first receive channel as a function of information symbol values; a second filter for generating a second expected received sample stream corresponding to the second receive channel as a function of information symbol values; a first adder, coupled to said first filter and said first radio unit, for generating the first initial error sample stream as a function of the first expected received sample stream and the first received sample stream; and a second adder, coupled to said second filter and said second radio unit, for generating the second initial error sample stream as a function of the second expected received sample stream and the second received sample stream.

Claim 20

Dependent Claim 35 words

The receiver of claim 15, wherein said producing means produces the first refined error sample stream by forming a linear combination including the first initial error sample stream and the second initial error sample stream.

Claim 21

Dependent Claim 43 words

The receiver of claim 15, wherein said means for generating channel tap coefficients includes a channel update unit for generating a first set of channel tap coefficients corresponding to the first receive channel as a function of the first refined error sample stream.

Claim 22

Dependent Claim 58 words

The receiver of claim 15, further including an impairment correlation estimator for generating an impairment correlation matrix, said impairment correlation matrix having at least two inputs and an output, wherein said at least two inputs are coupled respectively to said first and second receiving means and said output is connected to said producing means and said coherent detector.

Claim 23

Dependent Claim 26 words

The receiver of claim 19, wherein the producing means produces the first refined error sample stream by forming a linear combination including the impairment correlation matrix.

Claim 24

Dependent Claim 21 words

The receiver of claim 15, wherein said means for generating a set of estimated channel tap coefficients comprises a Kalman filter.

Claim 25

Dependent Claim 156 words

A channel sounding device having a first receive channel and a second receive channel, comprising: first receiving means for receiving a first received sample stream corresponding to the first receive channel; second receiving means for receiving a second received sample stream corresponding to the second receive channel; means for generating a set of estimated channel tap coefficients for at least one of the receive channels as a function of the first received sample stream and the second received sample stream, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 26

Dependent Claim 156 words

A channel sounding device having a first receive channel and a second receive channel, comprising: first receiving means for receiving a first received sample stream corresponding to the first receive channel; second receiving means for receiving a second received sample stream corresponding to the second receive channel; means for generating a set of estimated channel tap coefficients for at least one of the receive channels as a function of the first received sample stream and the second received sample stream, wherein said means for generating channel tap coefficients includes: first means for generating a first initial error sample stream corresponding to the first received sample stream; second means for generating a second initial error sample stream corresponding to the second received sample stream; and means for producing a first refined error sample stream corresponding to the first receive channel as a function of the first initial error sample stream and the second initial error sample stream.

Claim 27

Dependent Claim 140 words

The channel sounding device of claim 22, wherein said means for generating channel tap coefficients further includes: a first filter for generating a first expected received sample stream corresponding to the first receive channel as a function of information symbol values; a second filter for generating a second expected received sample stream corresponding to the second receive channel as a function of information symbol values; a first adder, coupled to said first filter and said first receiving means, for generating the first initial error sample stream as a function of the first expected received sample stream and the first received sample stream; and a second adder, coupled to said second filter and said second receiving means, for generating the second initial error sample stream as a function of the second expected received sample stream and the second received sample stream.

Claim 28

Dependent Claim 37 words

The channel sounding device of claim 22, wherein said producing means produces the first refined error sample stream by forming a linear combination including the first initial error sample stream and the second initial error sample stream.

Claim 29

Dependent Claim 45 words

The channel sounding device of claim 22, wherein said means for generating channel tap coefficients includes a channel update unit for generating a first set of channel tap coefficients corresponding to the first receive channel as a function of the first refined error sample stream.

Claim 30

Dependent Claim 56 words

The channel sounding device of claim 22, further including an impairment correlation estimator for generating an impairment correlation matrix, said impairment correlation matrix having at least two inputs and an output, wherein said at least two inputs are coupled respectively to said first and second receiving means and said output is connected to said producing means.

Claim 31

Dependent Claim 28 words

The channel sounding device of claim 26, wherein the producing means produces the first refined error sample stream by forming a linear combination including the impairment correlation matrix.

Claim 32

Dependent Claim 23 words

The channel sounding device of claim 27, wherein said means for generating a set of estimated channel tap coefficients comprises a Kalman filter.

Claim 33

Dependent Claim 185 words

A radio receiver having a plurality of receive channels, comprising: a plurality of radio units, each of said radio units corresponding to one of the plurality of receive channels and comprising means for generating a digital sample stream corresponding to one of said plurality of receive channels; and a joint channel estimator for generating a set of estimated channel tap coefficients for each of said plurality of receive channels wherein at least one set of estimated channel tap coefficients is dependent upon at least two of said plurality of digital sample streams wherein said joint channel estimator further comprises: a plurality of filters for generating expected values of said digital samples; a plurality of adders for receiving the digital samples and expected samples and generating first error samples for each receive channel; a precombiner connected to said plurality of adders for receiving the first error samples and generating second error samples for each receive channel; and a plurality of channel update units connected to said precombiner for receiving the second error samples generated by said precombiner and for generating estimates of the channel tap coefficients.

Claim 34

Dependent Claim 185 words

A radio receiver having a plurality of receive channels, comprising: a plurality of radio units, each of said radio units corresponding to one of the plurality of receive channels and comprising means for generating a digital sample stream corresponding to one of said plurality of receive channels; and a joint channel estimator for generating a set of estimated channel tap coefficients for each of said plurality of receive channels wherein at least one set of estimated channel tap coefficients is dependent upon at least two of said plurality of digital sample streams wherein said joint channel estimator further comprises: a plurality of filters for generating expected values of said digital samples; a plurality of adders for receiving the digital samples and expected samples and generating first error samples for each receive channel; a precombiner connected to said plurality of adders for receiving the first error samples and generating second error samples for each receive channel; and a plurality of channel update units connected to said precombiner for receiving the second error samples generated by said precombiner and for generating estimates of the channel tap coefficients.

Claim 35

Dependent Claim 28 words

A radio receiver according to claim 29 wherein said precombiner generates a second error sample for each receive channel by forming linear combinations of said first error samples.

Claim 36

Dependent Claim 16 words

A radio receiver according to claim 29 wherein said joint channel estimator comprises a Kalman filter.

Claim 37

Independent Claim 141 words

A method for estimating a set of channel tap coefficients for a receive channel in a system having a plurality of receive channels, comprising the steps of: receiving a plurality of communications signals over the plurality of receive channels; converting said plurality of communications signals into a plurality of digital sample streams; estimating a set of channel tap coefficients for one of said plurality of receive channels, whereby the channel tap coefficient estimates for said one of said plurality of receive channels are dependent upon at least two of said plurality of sample streams, further comprising the steps of: generating first error samples for each receive antenna; forming linear combinations of the first error samples to generate second error samples for each receive antenna; and generating a set of estimated channel tap coefficients for each of said plurality of receive antennas.

Claim 38

Independent Claim 141 words

A method for estimating a set of channel tap coefficients for a receive channel in a system having a plurality of receive channels, comprising the steps of: receiving a plurality of communications signals over the plurality of receive channels; converting said plurality of communications signals into a plurality of digital sample streams; estimating a set of channel tap coefficients for one of said plurality of receive channels, whereby the channel tap coefficient estimates for said one of said plurality of receive channels are dependent upon at least two of said plurality of sample streams, further comprising the steps of: generating first error samples for each receive antenna; forming linear combinations of the first error samples to generate second error samples for each receive antenna; and generating a set of estimated channel tap coefficients for each of said plurality of receive antennas.

Claim 39

Dependent Claim 49 words

The method of claim 32, further including the steps of: generating a first error sample stream for each receive antenna; applying the Kalman gain to said first error sample streams to generate a Kalman gain output; and providing the output of the Kalman gain to the Kalman signal model.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-10-12	2002-04-13	2002-10-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-10-12	2006-04-13	2006-10-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-10-12	2010-04-13	2010-10-13	$7700.00	Window Closed / Lapsed

Apparatus and method for joint channel estimation

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag