Method and system for predicting signal power to interference metric
View Patent ↗A method and system for predicting a signal power to interference metric for a communication channel in a coverage area of a phase sweep diversity communication system are provided. In the method, a signal power to interference metric for the communication channel is predicted based on a sweep frequency for transmissions in the coverage area. The signal power to interference metric predicted may be a carrier-to-interference ratio or a signal-to-noise plus interference ratio.
1. A method of predicting a signal power to interference metric, comprising:
determining an autocorrelation function for a communication channel based on a sweep frequency for transmissions in a coverage area of a phase sweep diversity communication system, the autocorrelation function having a time-variant component and a time-invariant component, the time-variant component being based on a phase offset between two antennas;
determining a prediction filter based on the sweep frequency and a succeeding time slot using the autocorrelation function;
determining a channel prediction of the communication channel based on the determined prediction filter; and
predicting the signal power to interference metric based on the determined channel prediction at a radio device,
the sweep frequency being the frequency at which at least one energy-focused beam is swept through the coverage area of the phase sweep diversity communication system.
2. The method of claim 1 , wherein
the determining a channel prediction step determines the channel prediction of the communication channel based on the sweep frequency, the determined prediction filter, and a pilot signal.
3. The method of claim 1 , wherein
the predicting the signal power to interference metric step determines the signal power to interference metric for the succeeding time slot.
4. The method of claim 1 , wherein the determining an autocorrelation function step determines the autocorrelation function based upon previous channel information for the coverage area and the sweep frequency.
5. The method of claim 1 , wherein the determining an autocorrelation function step determines the autocorrelation function based upon a Doppler frequency value of the coverage area and the sweep frequency.
6. The method of claim 1 , wherein the signal power to interference metric is a carrier-to-interference ratio.
7. The method of claim 1 , wherein the signal power to interference metric is a signal-to-noise plus interference ratio.
8. The method of claim 1 , wherein the time-invariant component is based on a Bessel function, and the time-variant component is based on an equivalent channel distortion function.
9. The method of claim 8 , wherein the autocorrelation function is,
σ
2
J
0
(
2
π
f
d
τ
)
+
1
2
[
R
h
1
h
2
(
τ
)
ⅇ
j
(
2
f
0
π1
-
f
0
πτ
+
ϕ
)
+
R
h
2
h
1
(
τ
)
ⅇ
-
j
(
2
f
0
π1
-
f
0
πτ
+
ϕ
)
]
,
wherein σ 2 denotes a power of an original channel, J 0 denotes a Bessel function of the 1st kind with 0th order, f d denotes a Doppler frequency, τ denotes a delay quantity, t denotes specific time, f 0 denotes a sweeping frequency, φ denotes an initial phase offset between two antennas, and R h 1 h 2 , R h 2 h 1 denote a Fourier transform of characteristics at the two antennas.
10. A method of predicting a signal power to interference metric, comprising:
predicting at a radio device the signal power to interference metric based on a determined channel prediction, the predicting including,
determining an autocorrelation function for the communication channel based on the sweep frequency, the determined autocorrelation function having a time-variant component and a time-invariant component, the lime-variant component being based on a phase offset between two antennas, and
determining a channel prediction of the communication channel based on the determined autocorrelation function,
the determined channel prediction based on a sweep frequency for transmissions in a coverage area of a phase sweep diversity communication system, the sweep frequency being the frequency at which at least one energy-focused beam is swept through the coverage area of the phase sweep diversity communication system.
11. The method of claim 10 , wherein
the determined channel prediction being further based on a pilot signal.
12. The method of claim 10 , wherein the predicting step further comprises:
determining a prediction filter for the communication channel based on the sweep frequency; and
determining the channel prediction of the communication channel based on the determined prediction filter.
13. The method of claim 12 , wherein
the determining a channel prediction step determines the channel prediction of the communication channel based on the prediction filter and a pilot signal.
14. The method of claim 10 , wherein the determining an autocorrelation function step determines the autocorrelation function based upon previous channel information for the coverage area and the sweep frequency.
15. The method of claim 10 , wherein the determining an autocorrelation function step determines the autocorrelation function based upon a Doppler frequency value of the coverage area and the sweep frequency.
16. The method of claim 10 , wherein the signal power to interference metric is a carrier-to-interference ratio.