Adaptive reception diversity method and adaptive transmission diversity method

• US 6,218,986 B1
• Filed: 06/23/2000
• Issued: 04/17/2001
• Est. Priority Date: 04/02/1997
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko, Yukitomo, Hideki
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): Mull, Fred H
• Application Number:
  US09/599,851
• Time in Patent Office: 298 Days
• Field of Search: 342/372, 342/368, 342/378, 342/369, 342/370, 342/371, 342/373, 342/374, 342/375, 342/376, 342/377
• US Class Current: 342/372
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/086 using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination

Abstract

By estimating the movement direction of a communication partner, the radiation pattern is forcibly rotated to thereby form a correct radiation pattern. Specifically, an apparatus of the present invention includes reception radiation pattern control section for providing a reception signal from an antenna with a first reception radiation pattern by a first control signal, radiation pattern control section for providing the abovementioned reception signal with a second reception radiation pattern by a second control signal based on an output of movement direction estimating section for estimating a movement direction of a transmitting side, and a reception signal processing system having multiplication section for multiplying the abovementioned reception signal by the first control signal and the second control signal. Consequently, even when the movement speed of the transmitting side or the receiving side is high, by causing a reception radiation pattern controller or a transmission radiation pattern controller to respond to the movement to thereby form a correct radiation pattern, the transmission and reception performance can be improved.

Claims

1. A method for controlling a reception radiation pattern, comprising:

determining a position and estimating a movement direction of a transmitting side apparatus based on position information transmitted from the transmitting side apparatus;

calculating a reception radiation pattern of a receiving side apparatus based on the position information of the transmitting side apparatus;

predicting a future position of the transmitting side apparatus, corresponding to a time of a next reception, based on the estimated movement direction of the transmitting side apparatus; and

calculating a corrected reception radiation pattern corresponding to the future position.

2. A method for controlling a reception radiation pattern, comprising:

estimating a position and a movement direction of a transmitting side apparatus based on position information transmitted from the transmitting side apparatus;

determining a phase variation due to a movement of the transmitting side apparatus; and

multiplying each of a plurality of inputs, corresponding to a plurality of antenna of the receiving side apparatus, by a value that cancels the phase variation; and

rotating a direction of the reception radiation pattern based on the plurality of inputs.

3. A method for controlling a transmission radiation pattern, comprising:

determining a position and estimating a movement direction of a receiving side apparatus based on position information transmitted from the receiving side apparatus;

calculating a transmission radiation pattern of a transmitting side apparatus based on the position information of the receiving side apparatus;

predicting a future position of the receiving side apparatus, corresponding to a time of a next reception, based on the estimated movement direction of the receiving side apparatus; and

calculating a corrected transmission radiation pattern corresponding to the future position.

4. A method for controlling a transmission radiation pattern, comprising:

estimating a position and a movement direction of a receiving side apparatus based on position information transmitted from the receiving side apparatus;

determining a phase variation due to a movement of the receiving side apparatus; and

multiplying each of a plurality of inputs, corresponding to a plurality of antenna of the transmitting side apparatus, by a value that cancels the phase variation; and

rotating a direction of the transmission radiation pattern based on the plurality of inputs.