US 9,001,944 B2 · Inter-carrier interference reduction for multi-carrier signals

Abstract

In mobile wireless communication systems the channel between the transmitter and receiver varies during a transmission. This is often referred to as fading, of which different kinds exist—each resulting in different impairments with specific properties. A low complexity scheme is described to reduce the noise created by inter-carrier interference or ICI. The method makes use of the guard interval and assumes slow variation of the channel. It is not restricted to wireless communication and can be used in any environment with varying channels.

Claims12

Dependent claims

A method of estimating an inter-carrier interference (ICI) for a multi-carrier signal received from a channel, in which signal symbols are separated by a guard interval including a cyclic extension of a symbol, the method comprising:

estimating the inter-carrier interference by a controller using a function:
A
~
⁡
(
n
)
=
rx
⁡
(
n
)
-
rx
⁡
(
n
-
N
)
N
for n=[N−G, N−1],
where:
rx(n) is the received signal at time n,
rx(n-N) is the received signal at time n-N,
N is the symbol length (not including the cyciic extention),
G is the cyciic extention length;
the estimating of the inter-carrier interference being in a time-domain before time-domain-to-frequency processing of the received multi-carrier signal.

26 more elements

A method of reducing an inter-carrier interference (ICI) for a received multicarrier signal in which symbols are separated by a guard interval including a cyclic extension of a symbol the method comprising:

estimating, by a processing apparatus in a receiver, the inter-carrier interference using a function:
A
~
⁡
(
n
)
=
rx
⁡
(
n
)
-
rx
⁡
(
n
-
N
)
N
for n=[N−G, N−1],
where:
rx(n) is the received signal at time n,
rx(n-N) is the received signal at time n-N,
N is the symbol length (not including the cyciic extention),
G is the cyciic extention length;
the estimating of the inter-carrier interference being in a time-domain before time-domain-to-frequency processing of the received multicarrier signal:
and using the estimation of ICI to reduce the ICI in the received multicarrier signal.

27 more elements

Dependencies are inferred from the claim text.

Abstract

Claims12

Dependent claims

estimating the inter-carrier interference by a controller using a function:
A
~
⁡
(
n
)
=
rx
⁡
(
n
)
-
rx
⁡
(
n
-
N
)
N
for n=[N−G, N−1],
where:
rx(n) is the received signal at time n,
rx(n-N) is the received signal at time n-N,
N is the symbol length (not including the cyciic extention),
G is the cyciic extention length;
the estimating of the inter-carrier interference being in a time-domain before time-domain-to-frequency processing of the received multi-carrier signal.

26 more elements

estimating, by a processing apparatus in a receiver, the inter-carrier interference using a function:
A
~
⁡
(
n
)
=
rx
⁡
(
n
)
-
rx
⁡
(
n
-
N
)
N
for n=[N−G, N−1],
where:
rx(n) is the received signal at time n,
rx(n-N) is the received signal at time n-N,
N is the symbol length (not including the cyciic extention),
G is the cyciic extention length;
the estimating of the inter-carrier interference being in a time-domain before time-domain-to-frequency processing of the received multicarrier signal:
and using the estimation of ICI to reduce the ICI in the received multicarrier signal.

27 more elements

Dependencies are inferred from the claim text.

Inter-carrier interference reduction for multi-carrier signals

Life of this patent

Abstract

Claims12

Inter-carrier interference reduction for multi-carrier signals

Life of this patent

Abstract

Claims12