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US 7,623,571 B2Granted
Wideband multiple access telecommunication method and apparatus
AssigneeImec
InventorsFrederik Petré, Geert Leus, Marc Moonen
Life of this patent
Estimating the term…
Abstract
A method and system for retrieving a desired user data symbol sequence from a received signal are disclosed. In one embodiment, the method includes i) receiving a channel modified version of a transmitted signal comprising a plurality of user data symbol sequences, each being encoded with a user specific known code, ii) determining an equalization filter directly and in a deterministic way from the received signal and iii) applying the equalization filter on the received signal to thereby retrieve the transmitted signal.
Claims27
A method of retrieving a desired user data symbol sequence from a received signal, the method comprising:
- receiving a channel modified version of a transmitted signal comprising a plurality of user data symbol sequences, each being encoded with a user specific known code and a pilot symbol;
- determining an equalization filter directly and in a deterministic way from the received signal whereby filter coefficients of the equalization filter are determined such that one version of the received signal after filtering by the equalization filter is as close as possible to a version of the pilot symbol, wherein the filter coefficients are directly computed by using an explicit equation;
- and
- applying the equalization filter on the received signal to thereby retrieve the transmitted signal,
- wherein the explicit equation is one of the following:
- w
- _
- a
- j
- j
- =
- arg
-
- min
- w
- a
- j
- j
-
-
- w
- a
- j
- j
-
- Y
- a
- j
- -
- x
- 0
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- C
- p
- j
- H
- -
- s
- p
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- (
- C
- p
- j
- H
-
- C
- p
- j
- )
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- j
- j
- ,
- s
- _
- d
- j
- =
- arg
-
-
- min
- f
- a
- j
- j
- ,
- s
- d
- j
-
-
- f
- a
- j
- j
-
- Y
- a
- j
- -
- s
- d
- j
-
- C
- d
- j
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
-
- f
- _
- a
- =
- arg
-
-
-
- min
- f
- a
-
-
- f
- a
-
- Y
- a
-
- (
- I
- BN
- -
- C
- d
- H
-
- C
- d
- )
- --
-
- s
- p
-
- C
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- H
- -
- s
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- p
- ,
- a
-
- C
- _
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
- or
- f
- _
- a
- =
- arg
-
- min
- f
- a
-
- {
-
- f
- a
-
- Y
- p
- ,
- a
- -
- s
- p
-
- C
- _
- p
-
- 2
- +
-
- f
- a
-
- Y
- d
- ,
- a
-
- (
- I
- DN
- -
- C
- _
- d
- H
-
- C
- _
- d
- )
-
- 2
- }
- ,
- wherein j is a base station number,
- wherein wajj, gajj, ƒajj, ƒa, ga are 1×(Q+1)M linear fully-trained chip-level equalizers,
- wherein Yaj, Ya are(Q+1)M×BN output matrices,
- wherein xoj is a row of every input matrix Xa,
- wherein CpjH, Cpj, are pilot composite matrices,
- wherein spj, sp, Sp,k are pilot symbol vectors,
- wherein Cdj is a multi-user composite code matrix,
- wherein sdj is a multi-user data symbol vector,
- wherein Cp, Cp,kH are pilot code sequence matrices,
- wherein Cd, CdH are user code sequence matrices,
- wherein Yp,a is part of output matrix Ya,
- wherein B is a block length,
- wherein M is a number of antennas,
- wherein N is a length of user specific codes,
- wherein Q is a temporal smoothing factor,
- wherein a denotes a delay,
- wherein d denotes a user,
- wherein p denotes a pilot, and
- wherein H denotes a Hadamard matrix.
459 more elements
A system for retrieving a desired user data symbol sequence from a received signal, comprising:
- a receiving section configured to receive a channel modified version of a transmitted signal comprising a plurality of user data symbol sequences, each being encoded with a user specific known code and a pilot symbol;
- a determining section configured to determine an equalization filter directly and in a deterministic way from the received signal whereby filter coefficients of the equalization filter are determined such that one version of the received signal after filtering by the equalization filter is as close as possible to a version of the pilot symbol, wherein the filter coefficients are directly computed by using an explicit equation;
- and
- an applying section configured to apply the equalization filter on the received signal to thereby retrieve the transmitted signal,
- wherein the explicit equation is one of the following:
- w
- _
- a
- j
- j
- =
- arg
-
- min
- w
- a
- j
- j
-
-
- w
- a
- j
- j
-
- Y
- a
- j
- -
- x
- 0
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- C
- p
- j
- H
- -
- s
- p
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- (
- C
- p
- j
- H
-
- C
- p
- j
- )
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- j
- j
- ,
- s
- _
- d
- j
- =
- arg
-
-
- min
- f
- a
- j
- j
- ,
- s
- d
- j
-
-
- f
- a
- j
- j
-
- Y
- a
- j
- -
- s
- d
- j
-
- C
- d
- j
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
-
- f
- _
- a
- =
- arg
-
-
-
- min
- f
- a
-
-
- f
- a
-
- Y
- a
-
- (
- I
- BN
- -
- C
- d
- H
-
- C
- d
- )
- --
-
- s
- p
-
- C
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- H
- -
- s
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- p
- ,
- a
-
- C
- _
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
- or
- f
- _
- a
- =
- arg
-
- min
- f
- a
-
- {
-
- f
- a
-
- Y
- p
- ,
- a
- -
- s
- p
-
- C
- _
- p
-
- 2
- +
-
- f
- a
-
- Y
- d
- ,
- a
-
- (
- I
- DN
- -
- C
- _
- d
- H
-
- C
- _
- d
- )
-
- 2
- }
- ,
- wherein j is a base station number,
- wherein wajj, gajj, ƒajj, ƒa, ga are 1×(Q+1)M linear fully-trained chip-level equalizers,
- wherein Yaj, Ya are(Q+1)M×BN output matrices,
- wherein xoj is a row of every input matrix Xa,
- wherein CpjH, Cpj, are pilot composite matrices,
- wherein spj, sp, Sp,k are pilot symbol vectors,
- wherein Cdj is a multi-user composite code matrix,
- wherein sdj is a multi-user data symbol vector,
- wherein Cp, Cp,kH are pilot code sequence matrices,
- wherein Cd, CdH are user code sequence matrices,
- wherein Yp,a is part of output matrix Ya,
- wherein B is a block length,
- wherein M is a number of antennas,
- wherein N is a length of user specific codes,
- wherein Q is a temporal smoothing factor,
- wherein a denotes a delay,
- wherein d denotes a user,
- wherein p denotes a pilot, and
- wherein H denotes a Hadamard matrix.
459 more elements
A system for retrieving a desired user data symbol sequence from a received signal, comprising:
- means for receiving a channel modified version of a transmitted signal comprising a plurality of user data symbol sequences, each being encoded with a user specific known code and a pilot symbol;
- means for determining an equalization filter directly and in a deterministic way from the received signal whereby filter coefficients of the equalization filter are determined such that one version of the received signal after filtering by the equalization filter is as close as possible to a version of the pilot symbol, wherein the filter coefficients are directly computed by using an explicit equation;
- and
- means for applying the equalization filter on the received signal to thereby retrieve the transmitted signal,
- wherein the explicit equation is one of the following:
- w
- _
- a
- j
- j
- =
- arg
-
- min
- w
- a
- j
- j
-
-
- w
- a
- j
- j
-
- Y
- a
- j
- -
- x
- 0
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- C
- p
- j
- H
- -
- s
- p
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- (
- C
- p
- j
- H
-
- C
- p
- j
- )
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- j
- j
- ,
- s
- _
- d
- j
- =
- arg
-
-
- min
- f
- a
- j
- j
- ,
- s
- d
- j
-
-
- f
- a
- j
- j
-
- Y
- a
- j
- -
- s
- d
- j
-
- C
- d
- j
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
-
- f
- _
- a
- =
- arg
-
-
-
- min
- f
- a
-
-
- f
- a
-
- Y
- a
-
- (
- I
- BN
- -
- C
- d
- H
-
- C
- d
- )
- --
-
- s
- p
-
- C
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- H
- -
- s
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- p
- ,
- a
-
- C
- _
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
- or
- f
- _
- a
- =
- arg
-
- min
- f
- a
-
- {
-
- f
- a
-
- Y
- p
- ,
- a
- -
- s
- p
-
- C
- _
- p
-
- 2
- +
-
- f
- a
-
- Y
- d
- ,
- a
-
- (
- I
- DN
- -
- C
- _
- d
- H
-
- C
- _
- d
- )
-
- 2
- }
- ,
- wherein j is a base station number,
- wherein wajj, gajj, ƒajj, ƒa, ga are 1×(Q+1)M linear fully-trained chip-level equalizers,
- wherein Yaj, Ya are(Q+1)M×BN output matrices,
- wherein xoj is a row of every input matrix Xa,
- wherein CpjH, Cpj, are pilot composite matrices,
- wherein spj, sp, Sp,k are pilot symbol vectors,
- wherein Cdj is a multi-user composite code matrix,
- wherein sdj is a multi-user data symbol vector,
- wherein Cp, Cp,kH are pilot code sequence matrices,
- wherein Cd, CdH are user code sequence matrices,
- wherein Yp,a is part of output matrix Ya,
- wherein B is a block length,
- wherein M is a number of antennas,
- wherein N is a length of user specific codes,
- wherein Q is a temporal smoothing factor,
- wherein a denotes a delay,
- wherein d denotes a user,
- wherein p denotes a pilot, and
- wherein H denotes a Hadamard matrix.
459 more elements
A method of retrieving a desired user data symbol sequence from a received signal, the method comprising:
- receiving, by an electronic device, a channel modified version of a transmitted signal comprising a plurality of user data symbol sequences, each being encoded with a user specific known code;
- determining, by the electronic device, an equalization filter directly and in a deterministic way from the received signal without channel estimation, wherein filter coefficients are directly computed by using an explicit equation;
- and
- applying, by the electronic device, the equalization filter on the received signal to thereby retrieve the transmitted signal,
- wherein the explicit equation is one of the following:
- w
- _
- a
- j
- j
- =
- arg
-
- min
- w
- a
- j
- j
-
-
- w
- a
- j
- j
-
- Y
- a
- j
- -
- x
- 0
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- C
- p
- j
- H
- -
- s
- p
- j
-
- 2
- ,
-
- g
- _
- a
- j
- j
- =
- arg
-
-
- min
- g
- a
- j
- j
-
-
- g
- a
- j
- j
-
- Y
- a
- j
-
- (
- C
- p
- j
- H
-
- C
- p
- j
- )
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- j
- j
- ,
- s
- _
- d
- j
- =
- arg
-
-
- min
- f
- a
- j
- j
- ,
- s
- d
- j
-
-
- f
- a
- j
- j
-
- Y
- a
- j
- -
- s
- d
- j
-
- C
- d
- j
- -
- s
- p
- j
-
- C
- p
- j
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
-
- f
- _
- a
- =
- arg
-
-
-
- min
- f
- a
-
-
- f
- a
-
- Y
- a
-
- (
- I
- BN
- -
- C
- d
- H
-
- C
- d
- )
- --
-
- s
- p
-
- C
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- H
- -
- s
- p
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- a
-
- C
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- g
- _
- a
- =
- arg
-
-
- min
- g
- a
-
-
- g
- a
-
- Y
- p
- ,
- a
-
- C
- _
- p
- ,
- k
- H
- -
- s
- p
- ,
- k
-
- 2
- ,
-
- f
- _
- a
- ,
- s
- _
- d
- =
- arg
-
-
- min
- f
- a
- ,
- s
- d
-
-
- f
- a
-
- Y
- a
- -
- s
- d
-
- C
- d
- -
- s
- p
-
- C
- p
-
- 2
- ,
- or
- f
- _
- a
- =
- arg
-
- min
- f
- a
-
- {
-
- f
- a
-
- Y
- p
- ,
- a
- -
- s
- p
-
- C
- _
- p
-
- 2
- +
-
- f
- a
-
- Y
- d
- ,
- a
-
- (
- I
- DN
- -
- C
- _
- d
- H
-
- C
- _
- d
- )
-
- 2
- }
- ,
- wherein j is a base station number,
- wherein wajj, gajj, ƒajj, ƒa, ga are 1×(Q+1)M linear fully-trained chip-level equalizers,
- wherein Yaj, Ya are(Q+1)M×BN output matrices,
- wherein xoj is a row of every input matrix Xa,
- wherein CpjH, Cpj, are pilot composite matrices,
- wherein spj, sp, Sp,k are pilot symbol vectors,
- wherein Cdj is a multi-user composite code matrix,
- wherein sdj is a multi-user data symbol vector,
- wherein Cp, Cp,kH are pilot code sequence matrices,
- wherein Cd, CdH are user code sequence matrices,
- wherein Yp,a is part of output matrix Ya,
- wherein B is a block length,
- wherein M is a number of antennas,
- wherein N is a length of user specific codes,
- wherein Q is a temporal smoothing factor,
- wherein a denotes a delay,
- wherein d denotes a user,
- wherein p denotes a pilot, and
- wherein H denotes a Hadamard matrix.
459 more elements
Dependencies are inferred from the claim text.