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US 7,680,222 B2Granted
Receiver and method of processing received data
AssigneeNokia Corporation
InventorMarkku J. Heikkilä
Life of this patent
Estimating the term…
Abstract
A receiver includes a channel estimator for estimating a channel impulse response of a radio channel; an equalizer for generating linear minimum mean-square error equalizer coefficients and providing an equalized signal to a correlator; an estimating unit for forming an initial estimate of received data elements on the basis of an equalized signal; and a processing unit. The processing unit is configured to calculate a scaling factor by taking an inverse value, subtracted from a value of one, of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, and to use the scaling factor for determining reliability of the initial estimate of the received data elements.
Claims32
A method comprising:
- forming, by a receiver, an initial estimate of received data elements on a basis of an equalized signal comprising the data elements;
- calculating a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square error equalizer coefficient vector are subtracted from a value of one before taking the inverse value;
- and
- using the scaling factor for determining reliability of the initial estimate of the received data elements.
1 more element
An apparatus comprising:
- a channel estimators, configured to estimate a channel impulse response of a radio channel;
- an equalizer, operably coupled to the channel estimator, configured to generate linear minimum mean-square error equalizer coefficients and to provide an equalized signal from a received signal, comprising data elements, that has travelled through the estimated radio channel;
- an estimating unit configured to form an initial estimate of the received data elements on a basis of the equalized signal;
- and
- a processing unit configured to calculate a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-squire error equalizer coefficient vector are subtracted from a value of one before taking the inverse value, and to use the scaling factor to determine reliability of the initial estimate of the received data elements.
2 more elements
An apparatus comprising:
- receiving means for receiving data elements from a radio channel;
- estimating means for estimating a channel impulse response of the radio channel;
- equalizing means for generating linear minimum mean-square error equalizer coefficients and providing an equalized signal comprising the data elements;
- estimating means for forming an initial estimate of the received data elements on a basis of the equalized signal;
- and
- processing means for calculating a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square equalizer coefficient vector are subtracted from a value of one before taking the inverse value, and for using the scaling factor for determining reliability of the initial estimate of the received data elements.
3 more elements
A system comprising:
- at least one receiver comprising
- at least one antenna configured to receive data elements from a radio channel;
- a channel estimator, operably coupled to the at least one antenna, configured to estimate a channel impulse response of the radio channel;
- an equalizer, operably coupled to the at least one antenna and to the channel estimator, configured to generate linear minimum mean-square error equalizer coefficients and providing an equalized signal;
- an estimating unit configured to form an initial estimate of the received data elements on a basis of the equalized signal comprising the received data elements;
- and
- a processing unit configured to calculate a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square error equalizer coefficient vector are subtracted from a value of one before taking the inverse value, and to use the scaling factor to determine reliability of the initial estimate of the received data elements.
4 more elements
A system, comprising:
- at least one receiver comprising
- receiving means for receiving data elements from a radio channel;
- estimating means for estimating a channel impulse response of the radio channel;
- equalizing means for generating linear minimum mean-square error equalizer coefficients and providing equalized signal comprising the received data elements;
- estimating means for forming an initial estimate of the received data elements on the basis of equalized signal;
- and
- processing means for calculating a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-squire error equalizer coefficient vector are subtracted from a value of one before taking the inverse value, and for using the scaling factor for determining reliability of the initial estimate of the received data elements.
4 more elements
A radio terminal, comprising:
- at least one receiver comprising
- at least one antenna configured to receive data elements from a radio channel;
- a channel estimator, operably coupled to the at least one antenna, configured to estimate a channel impulse response of the radio channel;
- an equalizer, operably coupled to the at least one antenna and to the channel estimator, configured to generate linear minimum mean-square error equalizer coefficients and to provide an equalized signal comprising the received data elements;
- an estimating unit configured to form an initial estimate of received data elements on a basis of an equalized signal;
- and
- a processing unit configured to calculate a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square error equalizer coefficient vector are subtracted from a value of one before taking the inverse value, and to use the scaling factor to determine reliability of the initial estimate of the received data elements.
4 more elements
A base station for a radio system, comprising:
- at least one receiver comprising
- at least one antenna configured to receive data elements from a radio channel;
- a channel estimator, operably coupled to the at least one antenna, configured to estimate a channel impulse response of the radio channel;
- an equalizer, operably coupled to the at least one antenna and to the channel estimator, configured to generate linear minimum mean-square error equalizer coefficients and to provide an equalized signal comprising the received data elements;
- an estimating unit configured to form an initial estimate of received data elements on a basis of the equalized signal;
- and
- a processing unit configured to calculate a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square error equalizer coefficient vector are subtracted from a value of one before taking the inverse value, and to use the scaling factor to determine reliability of the initial estimate of the received data elements.
4 more elements
A computer program product, embodied on a computer-readable medium, encoding a computer process of instructions for executing a computer process for processing received data, the process comprising:
- forming, by a receiver, an initial estimate of received data elements on a basis of an equalized signal comprising the data elements;
- calculating a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square error equalizer coefficient vector are subtracted from a value of one before taking the inverse value;
- and
- using the scaling factor for determining reliability of the initial estimate of the received data elements.
1 more element
A computer program distribution medium readable by a computer and encoding a computer program of instructions for executing a computer process for processing received data, the process comprising:
- forming, by a receiver, an initial estimate of received data elements on a basis of an equalized signal comprising the data elements;
- calculating a scaling factor by taking an inverse value of a conjugate transpose of a linear minimum mean-square error equalizer coefficient vector multiplied by a channel impulse response vector, wherein the multiplied channel impulse response vector and the conjugate transpose of the linear minimum mean-square error equalizer coefficient vector are subtracted from a value of one before taking the inverse value;
- and
- using the scaling factor for determining reliability of the initial estimate of the received data elements.
1 more element
Dependencies are inferred from the claim text.