Channel quality estimation method and receiving apparatus
AssigneeSony Ericsson Mobile Communications Japan, Inc.
InventorTakeshi Kokubo
Life of this patent
Estimating the term…
Abstract
Channel quality can be detected accurately in a wireless transmission system such as an HSDPA method. In the case of estimating a channel quality of a signal transmitted by a Code Division Multiple Access method and of estimating the channel quality in a system having a synchronization channel not orthogonal to a channel receiving data, a noise component of a desired channel is estimated; degree of a noise component caused by the synchronization channel is estimated with respect to the estimated noise; and a channel quality of a receiving channel is detected based on the estimated degree of the noise component.
Claims13
A channel quality estimation method for estimating a channel quality of a signal transmitted by a Code Division Multiple Access method and for estimating the channel quality in a system having a synchronization channel not orthogonal to a channel which receives data, comprising:
- estimating a noise component of a desired channel to provide an estimated noise by a noise estimation unit;
- estimating a degree of a noise component caused by the synchronization channel with respect to said estimated noise to provide an estimated degree of the noise component;
- detecting the channel quality of a receiving channel based on said estimated degree of the noise component;
- and
- determining a final value of channel quality by comparing the detected channel quality to a set of threshold values, wherein the set of threshold values is selected from among a plurality of sets of threshold values that are associated with a same channel quality value and changed based on the estimated degree of the noise component.
A receiving apparatus to receive a signal transmitted by a Code Division Multiple Access method and to estimate a channel quality in a system having a synchronization channel not orthogonal to a channel which receives data, comprising:
- noise component estimation means for estimating a noise component of a desired channel;
- synchronization channel noise degree estimation means for estimating a degree of the noise component caused by the synchronization channel with respect to the noise component estimated by said noise component estimation means;
- channel quality detection means for detecting the channel quality of a receiving channel based on the degree of the noise component estimated in said synchronization channel noise degree estimation means;
- and
- final channel quality value determining means for detecting a final channel quality value by comparing the detected channel quality to a set of threshold values, wherein the set of threshold values is selected from among a plurality of sets of threshold values that are associated with a same channel quality value and changed based on the estimated degree of the noise component.
A receiving apparatus to receive a signal transmitted by a Code Division Multiple Access method and to estimate a channel quality in a system having a synchronization channel not orthogonal to a channel which receives data, comprising:
- a noise component estimation unit configured to estimate a noise component of a desired channel;
- a synchronization channel noise degree estimation unit configured to estimate a degree of the noise component caused by the synchronization channel with respect to the noise component estimated by said noise component estimation unit;
- a channel quality detection unit configured to detect a channel quality of a receiving channel based on the degree of the noise component estimated in said synchronization channel noise degree estimation unit;
- and
- a final channel quality value determining unit configured to determine a final channel quality value by comparing the detected channel quality to a set of threshold values, wherein the set of threshold values is selected from among a plurality of sets of threshold values that are associated with a same channel quality value and changed based on the estimated degree of the noise component.
Dependencies are inferred from the claim text.