Multiple Channel Communication
A communication device ( 1 ) for communicating in a multiple channel communication system comprises means ( 9 ) for calculating an effective noise level of one of the channels of the system by applying an expectation operator to an estimated noise level affecting the channel based on time varying characteristics of the estimated noise level. The calculation of the effective noise level may also be based on an estimated path loss. The calculation of the effective noise level may also be based on an initial power level allocated to the respective channel. The effective noise level calculated for each channel may be employed in calculating power levels to be allocated to the respective channels.
1 . A communication device for communicating in a multiple channel communication system, the device comprising means for calculating an effective noise level of one of the channels of the system by applying an expectation operator to an estimated noise level affecting the channel based on time varying characteristics of the estimated noise level.
2 . The communication device of claim 1 , wherein the effective noise level calculation means bases the calculation of the effective noise level on an estimated path loss over the channel.
3 . The communication device of claim 1 , wherein the effective noise level calculation means bases the calculation of the effective noise level on the relation
N eff,i ∝ N i /L i
where is the expectation operator and L i is an estimated path loss over the channel.
4 . (canceled)
5 . (canceled)
6 . The communication device of claim 1 , wherein the effective noise level calculation means bases the calculation of the effective noise level on the relation
N
eff
,
i
∝
1
〈
L
i
/
N
i
〉
where is the expectation operator and L i is an estimated path loss over the channel.
7 . The communication device of claim 1 , wherein the effective noise level calculation means bases the calculation of the effective noise level on an initial power allocated to the channel.
8 . The communication device of claim 7 , wherein the effective noise level calculation means bases the calculation of the effective noise level on the relation
N
eff
,
i
∝
P
^
i
2
〈
log
2
(
1
+
P
^
i
L
i
/
N
i
)
〉
-
1
where is the expectation operator and L i is an estimated path loss over the channel.
9 . The communication device of claim 7 , comprising means for receiving an indication of the initial power allocated to the channel from another communication device with which the communication device communicates over the channel.
10 . The communication device of claim 7 , comprising means for estimating the initial power allocated to the channel.
11 . The communication device of claim 10 , wherein the initial power estimation means estimates the initial power allocated to the channel by dividing a total expected transmission power of another communication device with which the communication device communicates over the channel by an expected total number of channels.
12 . The communication device of claim 10 , wherein the initial power estimation means estimates the initial power allocated to the channel to be power previously allocated to the channel.
13 . The communication device of claim 1 , comprising means for transmitting the calculated effective noise level of the channel to another communication device with which the communication device communicates over the channel.
14 . The communication device of claim 1 , wherein the effective noise level calculation means calculates respective effective noise levels for the multiple channels of the system.
15 . The communication device of claim 14 , comprising means for calculating powers to be allocated to the channels of the system based on the calculated effective noise levels of the channels.
16 . A communication device for communicating in a multiple channel communication system, the communication device comprising:
means for receiving effective noise levels of the multiple channels, which are calculated by applying an expectation operator to an estimated noise level affecting a respective channel based on time varying characteristics of the estimated noise level; and
means for calculating powers to be allocated to the multiple channels of the system based on the received effective noise levels of the channels.
17 . The communication device of claim 15 , wherein the means for calculating the powers to be allocated to the respective channels bases calculates the powers by maximising total capacity of the channels.
18 . The communication device of claim 17 , wherein the means for calculating the powers to be allocated to the respective channels bases the calculation of the powers on the relation
C
total
∝
∑
i
log
2
(
1
+
P
i
/
N
eff
,
i
)
19 . The communication device of claim 15 , wherein the means for calculating the powers to be allocated to the respective channels distributes a total transmission power equally amongst a number of the channels having lower calculated effective noise levels.
20 . The communication device of claim 18 , wherein the means for calculating the powers to be allocated to the multiple channels selects the number of the multiple channels amongst which the total transmission power is distributed to maximise total capacity of the multiple channels.
21 . A method of transmitting data in a multiple channel communication system, the method comprising calculating an effective noise level of one of the channels of the system by applying an expectation operator to an estimated noise level affecting the channel based on time varying characteristics of the estimated noise level.
22 . The method of claim 21 , wherein the calculation of the effective noise level is based on an estimated path loss over the channel.
23 . The method of claim 21 , wherein the calculation of the effective noise level is based on the relation
N eff,i ∝ N i /L i
where is the expectation operator and L i is an estimated path loss over the channel.
24 . The method of claim 21 , wherein the expectation operator is applied to an estimated path loss over the channel based on time varying characteristics of the estimated path loss.
25 . (canceled)
26 . The method of claim 21 , wherein the calculation of the effective noise level is based on the relation
N
eff
,
i
∝
1
〈
L
i
/
N
i
〉
where is the expectation operator and L i is an estimated path loss over the channel.
27 . The method of claim 21 , wherein the calculation of the effective noise level is based on an initial power allocated to the channel.
28 . (canceled)
29 . The method of claim 27 , comprising receiving an indication of the initial power allocated to the channel from another communication device with which the operated communication device communicates over the channel.
30 . The method of claim 27 , comprising estimating the initial power allocated to the channel.
31 . The method of claim 30 , comprising estimating the initial power allocated to the channel by dividing a total expected transmission power of another communication device with which the operated communication device communicates over the channel by an expected total number of channels.
32 . The method of claim 30 , comprising estimating the initial power allocated to the channel to be power previously allocated to the channel.
33 . The method of claim 21 comprising transmitting the calculated effective noise level of the channel to an/the other communication device with which the operated communication device communicates over the channel.
34 . The method of claim 1 , comprising calculating respective effective noise levels for the multiple channels of the system.
35 . The method of claim 34 , comprising calculating powers to be allocated to the channels of the system based on the calculated effective noise levels of the channels.
36 . A method of transmitting data in a multiple channel communication system, the method comprising:
receiving effective noise levels of the multiple channels, which are calculated by applying an expectation operator to an estimated noise level affecting a respective channel based on time varying characteristics of the estimated noise level; and
calculating powers to be allocated to the multiple channels of the system based on the received effective noise levels of the channels.
37 . The method of claim 35 , further comprising calculating the powers to be allocated to the multiple channels of the system by maximising total capacity of the channels.
38 . The method of claim 37 , further comprising calculating the powers to be allocated to the respective channels based on the relation
C
total
∝
∑
i
log
2
(
1
+
P
i
/
N
eff
,
i
)
39 . The method of claim 35 , further comprising calculating the powers be allocated to the respective channels by distributing a total transmission power equally amongst a number of the channels having lower calculated effective noise levels.
40 . The method of claim 39 , further comprising calculating the powers to be allocated to the multiple channels by selecting the number of the multiple channels amongst which the total transmission power is distributed to maximise total capacity of the multiple channels.