Diversity transmission and reception method and equipment

• US 5,097,484 A
• Filed: 10/05/1989
• Issued: 03/17/1992
• Est. Priority Date: 10/12/1988
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Akaiwa, Yoshihiko
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Smith, Ralph
• Application Number:
  US07/417,559
• Time in Patent Office: 894 Days
• Field of Search: 375/40, 455/132, 455/133, 455/134, 455/135, 455/136, 455/272, 455/101, 455/103, 455/53, 455/54, 455/33
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/0811 during preamble or gap period
• CPC Class Codes: H04B 7/082 selecting best antenna path

Abstract

In an antenna-selection diversity transmission and reception equipment which is in digital communication with a transmission and reception equipment having a single antenna, and performs transmission and reception with time division by using the same radio frequencies, the antenna-selection diversity transmission and reception equipment comprises a plurality of antennae, a receiving part having a receiving unit, comparing unit and selecting unit which are adapted for a receiving-antenna selection diversity, and a transmitting part having a memory unit for storing antenna information that was selected by the receiving part. An antenna for transmission is selected from the plurality of antennae at the time of transmission in accordance with the information of the memory unit.

Claims

1. In an antenna-selection diversity transmission and reception equipment which is in digital communication with a transmission and reception equipment having a single antenna, and performs transmission and reception with time division by using the same radio frequencies, said antenna-selection diversity transmission and reception equipment comprising:

a plurality of antennae for receiving frame signals from said transmission and reception equipment having a single antenna, each of said frame signals being constituted by at least a preamble signal, an information signal and a postamble signal;

a receiving part having receiving means for detecting signal levels of the received frame signals and comparing means for generating antenna selection information by comparing the detected signal levels, said antenna selection information being generated at the time at least said postamble signal was received; and

a transmitting part having memory means for storing said antenna selection information transmitted by said comparing means of said receiving part; and

means to select an antenna for transmission from said plurality of antennae at the time of transmission in accordance with said antenna selection information of said memory means.

2. An antenna-selection diversity transmission and reception equipment as set forth in claim 1, wherein said antenna-selection diversity transmission and reception equipment is provided in a base station, and said transmission and reception equipment having a single antenna is provided in a mobile station.

3. A diversity transmission and reception equipment which performs digital communications with a transmission and reception equipment having a plurality of antennae and transmitting a frame signal including at least a first signal interval which is transmitted from one antenna selected from said plurality of antennae and a second signal interval which is transmitted with time division from said plurality of antennae in a predetermined sequence, comprising:

a single antenna for receiving said frame signal;

a receiving part for receiving each of signals of said second signal interval transmitted from said plurality of antennae and received to said single antenna, the receiving part having level comparing means for detecting a signal of highest level from said received signals of said second signal interval and transmitting said signal of highest level as a selection control signal; and

a transmitting part having a selection-control-signal transmitting part to which said selection control signal is inputted, the selection control signal being transmitted through said single antenna to said transmission and reception equipment having a plurality of antennae.

4. A diversity transmission and reception equipment as set forth in claim 3, wherein said diversity transmission and reception equipment is provided in a mobile station, and said transmission and reception equipment having a plurality of antennae is provided in a base station.

5. In a diversity transmission and reception method wherein digital communications are performed between first transmission and reception equipment having a plurality of antennae and second transmission and reception equipment having a single antenna, the improvement wherein said diversity transmission and reception method comprises:

transmitting a frame signal from said first transmission and reception equipment, the frame signal including at least a first signal interval which is transmitted from one antenna selected from said plurality of antennae and a second signal interval which is transmitted with time division from said plurality of antennae in predetermined sequence;

discriminating signals of said second signal interval of said frame signal transmitted from said first transmission and reception equipment, by said second transmission and reception equipment, and transmitting a signal most satisfactory among said signals of said second signal interval, as a selection control signal from said second transmission and reception equipment;

selecting an antenna for reception from said plurality of antennae of said first transmission and reception equipment by diversity antenna selection, and selecting an antenna for transmission from said plurality of antennae of said first transmission and reception equipment by reception of said selection control signal transmitted from said second transmission and reception equipment.

6. A diversity transmission and reception method as set forth in claim 5, wherein said second signal interval of said frame signal is provided after said first signal interval.

7. A diversity transmission and reception method as set forth in claim 5, wherein said first transmission and reception equipment having a plurality of antennae is provided in a base station, and said second transmission and reception equipment having a single antenna is provided in a mobile station.