Signal level estimation in radio communication system
View Patent ↗An indicator of a strength of a signal comprising a training sequence portion received in a radio propagation environment is provided. Samples are taken from the training sequence portion, an energy value of the samples over an estimated channel impulse response is computed and the indicator of the strength of the signal is estimated from the energy value.
1. A method, comprising:
taking samples, using a sampling unit, from a training sequence portion of a diversity signal received via a plurality of channels in a radio propagation environment, for each of the plurality of channels;
for each of the plurality of channels, estimating a channel impulse response;
for each of the plurality of channels, computing, using a computing unit, an energy value of the samples across the channel impulse response, thereby obtaining energy values for each of the plurality of channels;
combining the energy values, thereby obtaining a combined energy value; and
estimating, using an estimating unit, an indicator of a strength of the diversity signal from the combined energy value.
2. The method of claim 1 , further comprising
reporting the indicator towards a network.
3. The method of claim 2 , further comprising
removing interference from the diversity signal, upon estimating the channel impulse response.
4. The method of claim 1 , further comprising
removing interference from the diversity signal.
5. The method of claim 1 , wherein the energy value is computed by:
σ
r
2
=
1
K
-
L
+
1
∑
k
=
0
k
=
K
-
L
y
(
p
+
L
-
1
+
k
)
2
where K represents a number of training symbols in the training sequence portion, L represents a length of the channel impulse response, and p denotes a pointer pointing to the first training symbol in the training sequence portion of the signal.
6. A computer readable storage medium comprising a computer program product, the computer program product comprising program code for controlling a processor to execute a method comprising:
taking samples from a training sequence portion of a diversity signal received via a plurality of channels in a radio propagation environment, for each of the plurality of channels;
for each of the plurality of channels, estimating a channel impulse response;
for each of the plurality of channels, computing an energy value of the samples across the channel impulse response, thereby obtaining energy values for each of the plurality of channels;
combining the energy values, thereby obtaining a combined energy value; and
estimating an indicator of a strength of the diversity signal from the combined energy value.
7. The computer readable storage medium according to claim 6 , wherein the program code is directly loadable into an internal memory of the processing device.
8. An apparatus comprising:
a sampling unit configured to take samples from a training sequence portion of a diversity signal received via a plurality of channels in a radio propagation environment, for each of the plurality of channels;
a first estimating unit configured to estimate, for each of the plurality of channels, a channel impulse response;
a computing unit configured to compute, for each of the plurality of channels, an energy value of the samples across the channel impulse response, thereby obtaining energy values for each of the plurality of channels;
a combining unit configured to combine the energy values, thereby obtaining a combined energy value; and
a second estimating unit configured to estimate an indicator of a strength of the diversity signal from the combined energy value.
9. The apparatus of claim 8 , further comprising:
a reporting unit configured to report the indicator to a network.
10. The apparatus of claim 9 , further comprising:
a canceling unit configured to remove interference from the diversity signal, upon estimating the channel impulse response.
11. The apparatus of claim 8 , comprising a canceling unit configured to remove interference from the diversity signal.
12. The apparatus of claim 8 , wherein the computing unit is configured to compute the energy value by:
σ
r
2
=
1
K
-
L
+
1
∑
k
=
0
k
=
K
-
L
y
(
p
+
L
-
1
+
k
)
2
where K represents a number of training symbols in the training sequence portion, L represents a length of the channel impulse response, and p denotes a pointer pointing to the first training symbol in the training sequence portion of the signal.
13. The apparatus of claim 8 , wherein at least one of the sampling unit, the first estimating unit and the computing unit is provided for each of the plurality of channels.
14. The apparatus of claim 8 , wherein at least one of the sampling unit, the first estimating unit and the computing unit is provided as single unit for all of the plurality of channels.
15. A diversity receiver comprising:
an apparatus comprising
a sampling unit configured to take samples from a training sequence portion of a diversity signal received via a plurality of channels in a radio propagation environment, for each of the plurality of channels,
a first estimating unit configured to estimate, for each of the plurality of channels, a channel impulse response,
a computing unit configured to compute, for each of the plurality of channels, an energy value of the samples across the channel impulse response, thereby obtaining energy values for each of the plurality of channels,
a combining unit configured to combine the energy values, thereby obtaining a combined energy value, and
a second estimating unit configured to estimate an indicator of a strength of the diversity signal from the combined energy value.
16. The diversity receiver of claim 15 , wherein the diversity receiver is part of a user equipment.
17. The diversity receiver of claim 16 , wherein the diversity receiver is part of a base transceiver station.
18. A communication network system, comprising:
a user equipment; and
a base transceiver station,
wherein each of the user equipment and base transceiver station comprises an apparatus comprising
a sampling unit configured to take samples from a training sequence portion of a diversity signal received via a plurality of channels in a radio propagation environment, for each of the plurality of channels,
a first estimating unit configured to estimate, for each of the plurality of channels, a channel impulse response,
a computing unit configured to compute, for each of the plurality of channels, an energy value of the samples across the channel impulse response, thereby obtaining energy values for each of the plurality of channels,
a combining unit configured to combine the energy values, thereby obtaining a combined energy value, and
a second estimating unit configured to estimate an indicator of a strength of the diversity signal from the combined energy value.
19. A semiconductor chip comprising:
a sampling unit configured to take samples from a training sequence portion of a diversity signal received via a plurality of channels in a radio propagation environment, for each of the plurality of channels;
a first estimating unit configured to estimate, for each of the plurality of channels, a channel impulse response;
a computing unit configured to compute, for each of the plurality of channels, an energy value of the samples across the channel impulse response, thereby obtaining energy values for each of the plurality of channels;
a combining unit configured to combine the energy values, thereby obtaining a combined energy value; and
a second estimating unit configured to estimate an indicator of a strength of the diversity signal from the combined energy value.
20. The semiconductor chip of claim 19 , further comprising:
a reporting unit configured to report the indicator to a network.
21. The semiconductor chip of claim 20 , further comprising:
a canceling unit configured to remove interference from the diversity signal, upon estimating the channel impulse response.