Method of allocating power over channels of a communication system
View Patent ↗In one embodiment, the power for transmitting signals over at least one of a plurality of parallel channels is allocated based on a channel strength threshold and an estimated channel strength for the at least one channel. Here, the channel strength threshold is based on the estimated channel strengths for the plurality of channels.
1. A method for allocating transmission power, comprising:
allocating a power for transmitting a signal over at least one of a plurality of channels based on a channel strength threshold and an estimated channel strength for the at least one channel, the channel strength threshold being based on estimated channel strengths for the plurality of channels.
2. The method of claim 1 , wherein the plurality of channels are non-interacting parallel channels.
3. The method of claim 1 , wherein the allocating step allocates power over each of the plurality of channels, and for each channel, the allocating step allocates power based on the channel threshold and the estimated channel strength for the channel.
4. The method of claim 3 , wherein the plurality of channels are non-interacting parallel channels and signals being transmitted over at least a portion of the plurality of channels are non-Gaussian.
5. The method of claim 4 , further comprising:
calculating the channel strength threshold based on the estimated channel strengths for the plurality of channels and an average power available for transmission over the plurality of channels.
6. The method of claim 4 , further comprising:
accessing the channel strength threshold from a memory.
7. The method of claim 4 , further comprising:
estimating a channel strength for each of the plurality of channels.
8. The method of claim 7 , wherein the estimated channel strength for at least one channel is a normalized representation of a signal-to-noise ratio on the channel.
9. The method of claim 4 , wherein the allocating step allocates zero power to a channel in the plurality of channels if the estimated channel strength associated with the channel is less than or equal to the channel strength threshold.
10. The method of claim 9 , wherein the allocating step allocates a non-zero power to a channel in the plurality of channels based on the estimated channel strength for the channel if the estimated channel strength for the channel is greater than the channel strength threshold.
11. The method of claim 10 , wherein the allocating step allocates power to a channel j based on the following expression:
p
j
=
0
γ
j
≤
η
p
j
=
1
γ
j
MMSE
j
-
1
(
min
{
1
,
η
/
γ
j
}
)
γ
j
>
η
(
11
)
where γ j is the estimated channel strength of j, η is the channel strength threshold, and p j is the allocated power for channel j.
12. The method of claim 11 , wherein the channel strength threshold is determined according to the following expression:
∑
j
=
1
n
MMSE
j
-
1
(
min
{
1
,
η
/
γ
j
}
)
n
γ
j
=
P
avg
(
12
)
wherein η is a number of the plurality of channels.
13. The method of claim 4 , wherein the allocating step allocates a non-zero power to a channel in the plurality of channels based on the estimated channel strength for the channel if the estimated channel strength for the channel is greater than the channel strength threshold.
14. The method of claim 1 , further comprising:
calculating the channel strength threshold based on the estimated channel strengths for the plurality of channels and an average power available for transmission over the plurality of channels.
15. The method of claim 1 , further comprising:
accessing the channel strength threshold from a memory.
16. The method of claim 1 , wherein the estimated channel strength for the at least one channel is a normalized representation of a signal-to-noise ratio on the channel.
17. The method of claim 1 , wherein the allocating step allocates zero power to the at least one channel if the estimated channel strength associated with the at least one channel is less than or equal to the channel strength threshold.
18. The method of claim 17 , wherein the allocating step allocates a non-zero power to the at least one channel based on the estimated channel strength for the at least one channel if the estimated channel strength for the at least one channel is greater than the channel strength threshold.
19. The method of claim 1 , wherein the allocating step allocates a non-zero power to the at least one channel based on the estimated channel strength for the at least one channel if the estimated channel strength for the at least one channel is greater than the channel strength threshold.
20. A method for allocating channel transmission power, comprising:
allocating powers to a plurality of parallel non-interacting channels based on the average power available for transmission for the plurality of parallel non-interacting channels to maximize sum mutual information over the plurality of parallel non-interacting channels.