Transceiver having plural antennas and adjusting the time delay of transmitted signals to match the time delay of received signals

• US 5,613,219 A
• Filed: 12/06/1995
• Issued: 03/18/1997
• Est. Priority Date: 02/05/1993
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Vogel, Martin, van Kampen, Adrian
• Primary Examiner(s): Faile, Andrew
• Application Number:
  US08/567,863
• Time in Patent Office: 468 Days
• Field of Search: 455/67.1, 455/67.6, 455/78, 455/82-83, 455/89, 455/101, 455/103, 455/272-273, 455/276.1, 455/278.1, 455/296, 455/303-304, 455/337, 375/229, 375/260, 375/299, 375/347, 375/348, 375/349, 370/24, 370/29, 370/32, 370/77, 342/368, 342/371
• US Class Current: 455/78
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/084 Equal gain combining, only phase adjustments antenna beam scanning or forming by phase or amplitude control H01Q3/26, e.g. phased arrays
• CPC Class Codes: H04B 7/0894 using different delays between antennas

Abstract

A transceiver for use in a radio transmission system has a plurality of receiving antennas and a plurality of transmitting antennas. The time delays between received antenna signals produced by a radio signal transmitted from another transceiver in the system are detected. For transmission, the time delays between the transmitted antenna signals are adjusted to correspond to the detected time delays between the received antenna signals. By antenna sharing, each may actually serve for both transmission and reception. Since the delayed transmitted signals will arrive simultaneously at the other transceiver they will superpose on each other, thus achieving a significant improvement in received signal strength at such transceiver.

Claims

1. A transceiver for use in a radio communication system wherein said transceiver is one of a plurality of transceivers and communicates with at least an other of said transceivers, said one transceiver being remote from said other transceiver;

said one transceiver comprising;

a plurality of receiving antennas for producing separate received antenna signals from radio signals received from said other transceiver;

detecting means coupled to the receiving antennas for detecting a time delay between the received antenna signals;

transmitting means including a plurality of transmitting antennas for transmitting radio signals which are received at said other transceiver; and

means coupled to said transmitting means and further being responsive to an output of said time delay detecting means for producing a time delay between the transmitted radio signals which substantially matches the detected time delay between the received antenna signals.

2. The one transceiver as claimed in claim 1, wherein the transmitting and receiving antennas are arranged in pairs, each pair consisting of a transmitting antenna and a receiving antenna.

3. The one transceiver claimed in claim 2, wherein each pair of receiving and transmitting antennas is physically a single antenna which is switched so as to alternately serve as a receiving antenna and as a transmitting antenna.

4. The one transceiver claimed in claim 1, further comprising two quadrature related receive branches for demodulating the received antenna signals, and means for synchronizing the two receive branches.

5. The one transceiver claimed in claim 1, wherein said detecting means detects the time delay between the received antenna signals as a phase difference, and said means for producing a time delay between the transmitted radio signals produces a phase difference there-between.

6. The one transceiver claimed in claim 1, wherein said radio communication system is a mobile radio system which includes a base station, and said one transceiver is for use in said base station.

7. A transceiver for use in a ratio communication system wherein said transceiver is one of a plurality of transceivers and communicates with at least an other of said transceivers, said one transceiver being remote from said other transceiver;

said one transceiver comprising;

a plurality of receiving antennas for producing separate received antenna signals from radio signals received from said other transceiver;

detecting means coupled to the receiving antennas for detecting a time delay between the received antenna signals, wherein the detected time delay between the received antenna signals is derived from quadrature components thereof;

transmitting means including a plurality of transmitting antennas for transmitting radio signals which are received at said other transceiver; and

means coupled to said transmitting means for producing a time delay between the transmitted radio signals which substantially matches the detected time delay between the received antenna signals.

8. The one transceiver claimed in claim 7, wherein the transmitting and receiving antennas are arranged in pairs, each pair consisting of a transmitting antenna and a receiving antenna.

9. The one transceiver claimed in claim 8, wherein each pair of receiving and transmitting antennas is physically a single antenna which is switched so as to alternately serve as a receiving antenna and as a transmitting antenna.

10. The one transceiver claimed in claim 7, further comprising two quadrature related receive branches for demodulating the received antenna signals, and means for synchronizing the two receive branches.

11. The one transceiver claimed in claim 7, wherein said detecting means detects the time delay between the received antenna signals as a phase difference, and said means for producing a time delay between the transmitted radio signals produces a phase difference there-between.

12. The one transceiver claimed in claim 7, wherein said radio communication system is a mobile radio system which includes a base station, and said one transceiver is for use in said base station.

13. A base station transceiver for a mobile radio system which includes a base station and a mobile transceiver remote from the base station, said base station transceiver comprising:

a plurality of receiving antennas for producing separate antenna signals from radio signals received from the mobile transceiver;

detecting means coupled to the receiving antennas for detecting a time delay between the received antenna signals, wherein the detected time delay between the received antenna signals is derived from quadrature components thereof;

transmitting means including a plurality of transmitting antennas for transmitting radio signals which are received at the mobile transceiver; and

means coupled to said transmitting means for producing a time delay between the transmitted radio signals which substantially matches the detected time delay between the received antenna signals.

14. A mobile transceiver for use in a mobile radio system which includes a base station transceiver, said mobile transceiver comprising:

a plurality of receiving antennas for producing separate antenna signals from radio signals received from the base station transceiver;

detecting means coupled to the receiving antennas for detecting a time delay between the received antenna signals, wherein the detected time delay between the received antenna signals is derived from quadrature components thereof;

transmitting means including a plurality of transmitting antennas for transmitting radio signals to the base station transceiver; and

means coupled to said transmitting means for producing a time delay between the transmitted radio signals which substantially matches the detected time delay between the received antenna signals.