Space-division multiplex communication method of executing multiplex communication

• US 5,329,522 A
• Filed: 08/09/1993
• Issued: 07/12/1994
• Est. Priority Date: 03/23/1990
• Status: Expired due to Fees

• Current Assignee: Small Power Communication Systems Research Laboratories Co., Ltd.
• Original Assignee: Small Power Communication Systems Research Laboratories Co., Ltd.
• Inventors: Takagi, Tasuku
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): TON, DANG T
• Application Number:
  US08/103,311
• Time in Patent Office: 337 Days
• Field of Search: 370/70, 370/50, 370/100.1, 370/77, 370/29, 455/55.1, 455/60, 455/105, 455/56.1, 455/57.1, 455/58.1, 455/58.2, 455/59, 343/723, 343/732, 343/728, 343/888, 343/866, 343/855, 342/362, 342/363, 342/365, 342/367, 342/354, 342/351, 342/359, 342/360, 342/423, 342/428, 342/353, 342/429
• US Class Current: 370/280
• CPC Class Codes: H04B 7/24 for communication between two or more posts wireless communication networks H04W
• CPC Class Codes: H04J 99/00 Subject matter not provided for in other groups of this subclass

Abstract

In a space-division multiplex communication method of executing multiplex communication according to this invention, a plurality of radio beams a--a'"'"' to d--d'"'"' radiated at same frequency in different directions and rotated at same rotational angular speed ω are independently received in synchronism with the rotational angular speed ω by a plurality of communication terminals R1 to R3 arranged at arbitrary positions in a space where the radio beams can be received, thereby realizing unidirectional multiplex communication using the same frequency. Interstation bidirectional multiplex communication is performed by introducing a frequency-division system to the communication terminals R1 to R3 of the unidirectional multiplex communication. The space-division multiplex communication method can effectively use a frequency by a multiplex communication system of space-dividing a radio beam.

Claims

1. A time-division multiplex communication method of executing multiplex communication comprising the steps of:

outputting a plurality of radio beams of a same frequency radiated simultaneously from a transmission station in different directions;

rotating each of said plurality of radio beams at same rotational angular speed; and

allowing a plurality of communication terminals arranged in an area in which said plurality of radio beams radiated in different directions can be received, said radio beams being time divisionally divided by the number calculated in accordance with rotational angular speed and intentionally radiated from a single one of said plurality of communication terminals to each of the other of said plurality of communication terminals, said single communication terminal selecting at least one of said radio beams repeatedly radiated in synchronism with said time divisional timing and receiving only said radio beam in synchronism with said time divisional timing, thereby unidirectionally executing a multiplexing for other than said single communication terminal.

2. A method according to claim 1, wherein at least one of said plurality of radio beams includes a sync radio beam for providing a timing.

3. A time-division multiplex communication method of executing multiplex communication comprising the steps of:

outputting a plurality of radio beams of a same frequency, simultaneously radiated from a plurality of transmission/reception stations in different directions;

synchronically rotating said plurality of radio beams radiated from each of said transmission/reception stations;

allowing a plurality of transmission/reception stations arranged in an area in which said radio beams can be transmitted and received, a plurality of said radio beams from said transmission/reception stations except one transmission/reception station being time-divisionally divided by a number in accordance with a rotational angular speed so as to intermittently radiate a radio beam on said one transmission/reception station, and said one transmission/reception station selecting and receiving at least one radio beam in synchronism with intermittent timings; and

setting said intermittent timings by use of a sync radio beam commonly provided in each of said stations, radio beams of a same frequency radiating from said transmission/reception stations being time-divisionally divided in order for one of transmission/reception stations to receive said time-divided radio beams radiated from the other transmission/reception stations, thereby executing interstation bidirectional multiplex communication.

4. A method according to claim 3, wherein a plurality of radio beams of same frequency radiating interstationally in an unidirection are time-divisionally divided and transmitted or received by each of transmission/reception station, thereby executing bidirectional multiplexed communication.