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US 7,443,928 B2Granted
Signal detection using sphere decoding technique
AssigneeNokia Corporation
InventorsNikolai Nefedov, Manuel Enrique Ramirez Montalvo, Ari Hottinen
Life of this patent
Estimating the term…
Abstract
Method and apparatus for detecting a signal are disclosed, wherein first set of symbols represents a signal received in a receiver. A second set of symbols is estimated, representing the signal transmitted at a transmitter using a sphere decoding technique. The estimation may employ at least two modulation schemes. Reliability information relating to bits forming a symbol may be determined for at least one symbol of the second set. Furthermore, reliability information relating to the signal may be taken into account in estimating at least one symbol of the second set.
Claims55
A method, comprising:
- receiving a first set of symbols representing a signal received in a receiver;
- and
- estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein said estimating defines a vector and each vector value of the vector contains a modulation scheme, said estimating concurrently employing at least two modulation schemes.
A method, comprising:
- receiving a first set of symbols representing a signal received at a receiver;
- estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique;
- determining a symbol constellation defining a relationship between a plurality of the second set of symbols and a plurality of bit sequences;
- determining a first sub-constellation of the second set of symbols relating to a given bit of a bit sequence having a value of 1;
- determining a second sub-constellation of the second set of symbols relating to a said given bit of a bit sequence having a value of 0;
- and
- determining reliability information relating to bits forming a symbol for at least one symbol of said second set of symbols.
4 more elements
A method, comprising:
- receiving a first set of symbols representing a signal received at a receiver;
- and
- estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein reliability information relating to bits forming a symbol of the second set of symbols is taken into account in estimating at least one symbol of the second set of symbols, wherein
- the reliability information defines a symbol constellation relationship between a plurality of the second set of symbols and a plurality of bit sequences,
- a first sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 1, and
- a second sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 0.
3 more elements
A method, method, comprising:
- receiving a first set of symbols representing a signal received at a receiver;
- and
- estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein reliability information relating to said signal is taken into account in estimating at least one symbol of the second set of symbols, wherein
- said estimating said second set of symbols comprises determining averaged probabilities of a priori bit probabilities comprised in said reliability information and bit probabilities given symbols of said first set of symbols.
1 more element
An apparatus, comprising:
- a receiver configured to receive a first set of symbols representing a signal received at a receiver antenna;
- and
- an estimator configured to estimate a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein
- said estimator is configured to define a vector and each vector value of the vector contains a modulation scheme, and to concurrently employ at least two modulation schemes in estimating said second set of symbols.
1 more element
An apparatus, comprising:
- a receiver configured to receive a first set of symbols representing a signal received at a receiver antenna;
- an estimator configured to estimate a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique;
- and
- a determiner configured to
- determine a symbol constellation defining a relationship between a plurality of the second set of symbols and a plurality of bit sequences,
- determine a first sub-constellation of the second set of symbols relating to a given bit of a bit sequence having a value of 1,
- determine a second sub-constellation of the second set of symbols relating to said given bit of a bit sequence having a value of 0, and
- determine reliability information relating to bits forming a symbol for at least one symbol of said second set of symbols.
5 more elements
An apparatus, comprising:
- a receiver configured to receive a first set of symbols representing a signal received at a receiver antenna;
- and
- an estimator configured to estimate a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein reliability information relating to the bits forming a symbol of the second set of symbols is taken into account in estimating at least one symbol of the second set of symbols, wherein
- the reliability information defines a symbol constellation relationship between a plurality of the second set of symbols and a plurality of bit sequences,
- a first sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 1, and
- a second sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 0.
3 more elements
A system, comprising:
- a receiver configured to receive a first set of symbols representing a signal received at a receiver antenna;
- and
- an estimator configured to estimate estimating means for estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein
- the estimator is configured to define a vector and each vector value of the vector contains a modulation scheme, and to concurrently employs at least two modulation schemes.
1 more element
A system, comprising:
- receiver configured to receive a first set of symbols representing a signal received at a receiver antenna;
- an estimator configured to estimate a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique;
- and
- a determiner configured to
- determine a symbol constellation defining a relationship between a plurality of the second set of symbols and a plurality of bit sequences,
- determine a first sub-constellation of the second set of symbols relating to a given bit of a bit sequence having a value of 1,
- determine a second sub-constellation of the second set of symbols relating to said given bit of a bit sequence having a value of 0, and
- determine reliability information relating to bits forming a symbol for at least one symbol of said second set of symbols.
5 more elements
A system, comprising:
- a receiver configured to receive a first set of symbols representing a signal received at a receiver antenna;
- and
- an estimator configured to estimate a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein reliability information relating to the bits forming a symbol of the second set of symbols is taken into account in estimating at least one symbol of the second set of symbols, wherein
- the reliability information defines a symbol constellation relationship between a plurality of the second set of symbols and a plurality of bit sequences,
- a first sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 1, and
- a second sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 0.
3 more elements
An apparatus, comprising:
- receiving means for receiving a first set of symbols representing a signal received at a receiver antenna;
- and
- estimating means for estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein
- said apparatus is configured to define a vector and each vector value of the vector contains a modulation scheme, and to concurrently employ at least two modulation schemes in estimating said second set of symbols.
1 more element
An apparatus, comprising:
- receiving means for receiving a first set of symbols representing a signal received at a receiver antenna;
- estimating means for estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique;
- and
- determining means for determining constellation defining a relationship between a plurality of the second set of symbols and a plurality of bit sequences, determining a first sub-constellation of the second set of symbols relating to a given bit of a bit sequence having a value of 1, determining a second sub-constellation of the second set of symbols relating to said given bit of a bit sequence having a value of 0, and determining reliability information relating to bits forming a symbol for at least one symbol of said second set of symbols.
1 more element
An apparatus, comprising:
- receiving means for receiving a first set of symbols representing a signal received at a receiver antenna;
- and
- estimating means for estimating a second set of symbols representing said signal transmitted at a transmitter using a sphere decoding technique, wherein
- reliability information relating to the bits forming a symbol of the second set of symbols is taken into account in estimating at least one symbol of the second set of symbols,
- the reliability information defines a symbol constellation relationship between a plurality of the second set of symbols and a plurality of bit sequences,
- a first sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 1, and
- a second sub-constellation of the second set of symbols relates to a given bit of the bit sequence having a value of 0.
4 more elements
Dependencies are inferred from the claim text.