Radio reception apparatus and directivity reception method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshiyasu Hirayama, Takahisa Aoyama
Life of this patent
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Abstract
Delay profile creation sections 7 and 8 create a delay profile for each of fixed directivity reception signals combined using a plurality of fixed weight patterns. A path search section 11 detects a delay profile in which the maximum peak has appeared. An initial value weight selection section 12 selects the fixed weight corresponding to the delay profile in which the maximum peak has appeared as an initial value weight. An adaptive array antenna reception control section 13 uses this initial value weight as the initial value of an optimization algorithm to calculate the optimal weight of the adaptive array antenna. Thus, it is possible to reduce the time required to calculate the optimal weight by means of the optimization algorithm.
Claims9
A radio reception apparatus comprising:
- a plurality of antenna elements;
- a fixed directivity creation section that creates a plurality of fixed directivity reception signals by combining outputs of said plurality of antenna elements using a plurality of fixed weight patterns;
- delay profile creation sections that create a delay profile for each of said plurality of fixed directivity reception signals;
- an arrival direction estimation section that estimates a direction of arrival of a transmission wave by detecting peaks that appear in said plurality of delay profiles;
- and
- an adaptive directivity creation section that creates an adaptive directivity reception signal by calculating an adaptive weight, to be multiplied by a plurality of reception signals obtained by said plurality of antenna elements, based on said estimated direction and combining the reception signals using said calculated adaptive weight, wherein,
- said adaptive directivity creation section calculates the adaptive weight using a fixed weight, utilized when creating a fixed directivity reception signal corresponding to a delay profile in which a maximum leak was detected, as an initial value weight of an optimization algorithm.
A radio reception apparatus comprising:
- a plurality of antenna elements;
- a fixed directivity creation section that creates a plurality of fixed directivity reception signals by combining outputs of said plurality of antenna elements using a plurality of fixed weight patterns;
- delay profile creation sections that create a delay profile for each of said plurality of directivity reception signals;
- an arrival direction estimation section that estimates a direction of arrival of a transmission wave by detecting peaks that appear in said plurality of delay profiles;
- a beam steering reception section that scans directivity beams within a predetermined angular range and acquires a reception signal in a direction in which a highest reception level is obtained;
- and
- a scanning range selection section that selects a scanning range of said beam steering reception section based on said estimated direction.
A directivity reception method comprising the steps of:
- (a) creating a plurality of fixed directivity reception signals by combining outputs of a plurality of antenna elements using a plurality of fixed weight patterns;
- (b) creating a delay profile for each of said plurality of fixed directivity reception signals;
- (c) estimating a direction of arrival of a transmission wave by detecting peaks that appear in said plurality of delay profiles;
- (d) calculating an adaptive weight to be multiplied by a plurality of reception signals obtained by said plurality of antenna elements based on said estimated direction;
- and
- (e) creating an adaptive directivity reception signal by combining said reception signals using said calculated adaptive weight, wherein,
- step (e) comprises calculating the adaptive weight using a fixed weight, utilized when creating a fixed directivity reception signal corresponding to a delay profile in which a maximum peak was detected, as an initial value weight of an optimization algorithm.
A directivity reception method comprising the steps of:
- (a) creating a plurality of fixed directivity reception signals by combining outputs of a plurality of antenna elements using a plurality of fixed weight patterns;
- (b) creating a delay profile for each of said plurality of fixed directivity reception signals;
- (c) estimating a direction of arrival of a transmission wave by detecting peaks that appear in said plurality of delay profiles;
- (d) selecting a scanning range in accordance with said estimated direction;
- and
- (e) scanning directivity beams within said selected scanning range and acquiring a reception signal in a direction in which a highest reception level is obtained.
Dependencies are inferred from the claim text.