Wireless base station and a wireless phone

• US 20050037788A1
• Filed: 08/24/2004
• Published: 02/17/2005
• Est. Priority Date: 02/14/2000
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Ishida, Akira
• Granted Patent: US 7,085,572 B2
• Time in Patent Office: Days
• US Class Current: 455/502
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

On receiving a link channel assignment request or a link channel reassignment request from a mobile station, a wireless base station specifies a unique word (UW) that is not assigned to any other mobile stations, and sends a channel assignment notification containing the specified UW to the requesting mobile station. The base station also sends the specified UW to its user processing unit, which extracts a signal sent from the requesting mobile station and generates a signal to be sent to this mobile station. The base station then defines a reference signal based on the sent UW, and adjusts each weight vector by using the defined reference signal and a signal estimated to have been sent from the requesting mobile station, thereby directing the directivity pattern to the requesting mobile station.

Claims

1. A wireless phone, comprising:

receiving means for receiving a word for synchronization sent from a wireless base station; and

sending means for sending the word for synchronization to the wireless base station, the word for synchronization being sent preceding a main data that is a content of communication.

2. A wireless phone according to claim 1, further comprising:

link channel assignment requesting means for sending a link channel assignment request to a wireless base station, wherein

the receiving means receives the word for synchronization from the wireless base station, after the link channel assignment request is sent to the wireless base station.

3. A wireless phone, according to claim 1, that wirelessly communicates with a wireless base station, wherein

the wireless base station wirelessly communicates with a plurality of wireless phones by using space division multiplexing (SDM), and sends a different word for synchronization to each of the plurality of wireless phones.

4. A wireless phone according to claim 3, that wirelessly communicates with the wireless base station, wherein

the wireless base station extracts communication data relating to a wireless phone with which the wireless base station is communicating, by:

(a) defining a reference signal containing a word for synchronization that is sent to the wireless phone with which the wireless base station is communicating;

(b) obtaining a second signal that is estimated to be a signal relating to the communication data by forming a directivity pattern, using a plurality of first signals that are sequentially received via an antenna;

(c) sequentially calculating based on the reference signal and the second signal;

(d) adjusting the second signal by sequentially adjusting the directivity pattern by reflecting a result of the calculation; and

(e) regarding the adjusted second signal as communication data sent from the wireless phone with which the wireless base station is communicating.