Apparatus and methods for reducing channel estimation noise in a wireless transceiver
First Claim
1. A method for reducing noise in channel estimation of a communication signal comprising:
- a) determining a channel activity portion and a noise portion of a P-point time-domain channel estimation;
b) determining a noise energy density value ŵ
of channel estimates occurring during the noise portion of the channel estimation by adjusting the noise energy density value by a predetermined constant λ
;
c) comparing energy values of channel estimates for at least a portion of the channel estimation to the noise energy density value; and
d) setting channel estimate values below a threshold to a predetermined value for each channel estimate having an energy value less than the noise energy density value,wherein ŵ
is determined as;
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus and methods for use in a wireless communication system are disclosed for reducing channel estimation noise in a device such as a wireless transceiver. A disclosed apparatus includes a processor that determines a channel activity portion and a noise portion of a channel estimation. The processor also determines a threshold noise level based on channel estimate values in the noise portion of the channel estimation. The processor compares channel estimate energy values in the channel estimation to the threshold noise level and sets each of the channel estimate energy values being less than the threshold noise level to a predetermined value such as zero in order to reduce or eliminate the noise. Similar methods are also disclosed.
-
Citations
54 Claims
-
1. A method for reducing noise in channel estimation of a communication signal comprising:
-
a) determining a channel activity portion and a noise portion of a P-point time-domain channel estimation; b) determining a noise energy density value ŵ
of channel estimates occurring during the noise portion of the channel estimation by adjusting the noise energy density value by a predetermined constant λ
;c) comparing energy values of channel estimates for at least a portion of the channel estimation to the noise energy density value; and d) setting channel estimate values below a threshold to a predetermined value for each channel estimate having an energy value less than the noise energy density value, wherein ŵ
is determined as; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for reducing noise in a communications channel estimation comprising:
-
a) determining a channel activity portion and a noise portion of a P-point time-domain channel estimation; b) determining a threshold noise level based on channel estimate values in the noise portion of the channel estimation; c) comparing at least a portion of channel estimate values in the channel estimation to the threshold noise level; d) setting each of the at least a portion of channel estimate energy values being less than the threshold noise level to a predetermined value.; wherein determining the noise threshold value includes determining noise energy density value ŵ
of channel estimates occurring during the noise portion of the channel estimation,wherein ŵ
is determined as; - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A non-transitory computer readable medium having instructions stored thereon, the stored instructions, when executed by a processor, cause the processor to perform a method to reduce noise in a communications channel estimation, the method comprising:
-
a) determining a channel activity portion and a noise portion of a P-point time-domain channel estimation; b) determining a noise energy density value of channel estimates occurring during the noise portion of the channel estimation by adjusting the noise energy density value by a predetermined constant λ
;c) comparing energy values of channel estimates for at least a portion of the channel estimation to the noise energy density value; and d) setting channel estimate values below a threshold to a predetermined value for each channel estimate having an energy value less than the noise energy density value, wherein ŵ
is determined as; - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
-
-
26. A non-transitory computer readable medium having instructions stored thereon, the stored instructions, when executed by a processor, cause the processor to perform a method to reduce noise in a communications channel estimation, the method comprising:
-
determining a channel activity portion and a noise portion of a P-point time-domain channel estimation; determining a threshold noise level based on channel estimate values in the noise portion of the channel estimation; comparing at least a portion of channel estimate values in the channel estimation to the threshold noise level; and setting each of the at least a portion of channel estimate energy values being less than the threshold noise level to a predetermined value;
wherein determining the noise threshold value includes determining noise energy density value ŵ
of channel estimates occurring during the noise portion of the channel estimation,wherein ŵ
is determined as; - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
-
-
36. A transceiver apparatus configured to reduce noise in a channel estimation comprising:
a channel estimator processor configured to; determine a channel activity portion and a noise portion of a P-point time-domain channel estimation; determine a noise energy density value ŵ
of channel estimates occurring during the noise portion of the channel estimation and adjusting the noise energy density value by a predetermined constant λ
;compare energy values of channel estimates for at least a portion of the channel estimation to the noise energy density value; and set channel estimate values below a threshold to a predetermined value for each channel estimate having an energy value less than the noise energy density value, wherein ŵ
is determined as;- View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 52)
-
45. A transceiver apparatus configured to reduce noise in a channel estimation comprising:
a channel estimator processor configured to; determine a channel activity portion and a noise portion of a P-point time-domain channel estimation; determine a threshold noise level based on channel estimate values in the noise portion of the channel estimation; compare at least a portion of channel estimate values in the channel estimation to the threshold noise level; set each of the at least a portion of channel estimate energy values being less than the threshold noise level to a predetermined value;
wherein the processor is further configured to determine a noise energy density value ŵ
of channel estimates occurring during the noise portion of the channel estimation to determine the threshold value, and further configured to adjust the noise energy density value ŵ
by a predetermined constant λ
to determine the energy density value of channel estimates occurring during the noise portion of the channel estimation,wherein ŵ
is detetinined as;- View Dependent Claims (46, 47, 48, 49, 50, 51)
-
53. An apparatus for resolving timing in a wireless communication device comprising:
-
means for determining a channel activity portion and a noise portion of a P-point time-domain channel estimate; means for determining a noise energy density ê
of the channel estimate occurring during the noise portion of the channel estimate by adjusting the noise energy density value by a predetermined constant λ
;means for determining whether the energy of at least a portion of kth channel estimates are less than the value of the noise energy density; and means for setting the channel estimate to zero when the energy of a channel estimate is less than the value of the noise energy density, wherein ŵ
is determined as; - View Dependent Claims (54)
-
Specification