Simulcasting system with diversity reception

• US 5,845,199 A
• Filed: 12/05/1996
• Issued: 12/01/1998
• Est. Priority Date: 12/05/1996
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Longshore, Theodore F.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): BANKS HAROLD, MARSHA DENISE
• Application Number:
  US08/760,493
• Time in Patent Office: 726 Days
• Field of Search: 455/500, 455/503, 455/517, 455/561, 455/562, 455/73, 455/507, 455/132, 455/133, 455/137
• US Class Current: 455/137
• 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: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Abstract

The present invention provides a system for simulcasting and diversely receiving radio frequency (RF) signals. The system of the present invention comprises at least one RF transceiver and a plurality of RF units each including a transmitter for simulcasting an RF signal to a user and further including one receiver which is paired with another receiver in another one of the RF units, the pair of receivers providing for diversity reception of an RF signal from the user. The implementation of diversity reception with only one instead of two receivers in each RF unit, as taught by the present invention, reduces both signal loss and required cabling in the system.

Claims

1. A system for simulcasting at least one radio frequency (RF) signal to at least one user and for diversely receiving at least one other RF signal from said at least one user, the system comprising:

at least one RF transceiver for transmitting said at least one RF signal to said at least one user and for receiving said at least one other RF signal from said at least one user;

a plurality of RF units each including a transmitter for simulcasting said at least one RF signal to said at least one user and further including one receiver which is paired with another receiver in another one of said RF units such that each pair of receivers provides for diversity reception of said at least one other RF signal from said at least one user; and

means for connecting said at least one RF transceiver to said RF units.

2. The system of claim 1 wherein said at least one RF transceiver comprises an analog transceiver.

3. The system of claim 1 wherein said at least one RF transceiver comprises a digital transceiver.

4. The system of claim 3 wherein said digital transceiver uses time division multiple access (TDMA).

5. The system of claim 3 wherein said digital transceiver uses code division multiple access (CDMA).

6. The system of claim 1 wherein each of said RF units comprises a transmit and/or a receive amplifier.

7. The system of claim 6 wherein each of said RF units further comprises an RF converter.

8. The system of claim 1 wherein the two RF units corresponding to any pair of receivers are separated from each other by a distance which is not greater than would allow said at least one other RF signal from said at least one user to be simultaneously received by said pair of receivers.

9. The system of claim 1 wherein said at least one RF transceiver comprises a plurality of RF transceivers for transmitting a plurality of RF signals to a plurality of users and for receiving a plurality of RF signals from said users, and wherein said connecting means comprises:

a transmitter combiner for combining the outputs of said transceivers into a combined transmit RF signal;

a transmitter splitter for splitting the combined transmit RF signal into a plurality of transmit signals for simultaneous transmission by said RF units;

a first receiver combiner for combining the outputs of first ones of the receivers in said pairs of receivers into a first combined received RF signal;

a second receiver combiner for combining the outputs of second ones of the receivers in said pairs of receivers into a second combined received RF signal;

a first receiver splitter for splitting the first combined received RF signal into a plurality of first received signals for respective delivery to said RF transceivers; and

a second receiver splitter for splitting the second combined received RF signal into a plurality of second received signals for respective delivery to said RF transceivers.

10. The system of claim 9 wherein each of said RF units is connected to said transmitter splitter with one cable and is further connected to either said first receiver combiner or said second receiver combiner with another cable.

11. The system of claim 9 wherein each of said RF units is connected both to said transmitter splitter and to either said first receiver combiner or said second receiver combiner with one cable.

12. A method for simulcasting at least one radio frequency (RF) signal to at least one user and for diversely receiving at least one other RF signal from said at least one user, the method comprising the steps of:

providing at least one RF transceiver for transmitting said at least one RF signal to said at least one user and for receiving said at least one other RF signal from said at least one user;

providing a plurality of RF units each including a transmitter for simulcasting said at least one RF signal to said at least one user and further including one receiver which is paired with another receiver in another one of said RF units such that each pair of receivers provides for diversity reception of said at least one other RF signal from said at least one user; and

interconnecting said at least one transceiver to said RF units.

13. The method of claim 12 wherein said at least one RF transceiver comprises an analog transceiver.

14. The method of claim 12 wherein said at least one RF transceiver comprises a digital transceiver.

15. The method of claim 14 wherein said digital transceiver uses time division multiple access (TDMA).

16. The method of claim 14 wherein said digital transceiver uses code division multiple access (CDMA).

17. The method of claim 12 wherein each of said RF units comprises a transmit and/or a receive amplifier.

18. The method of claim 17 wherein each of said RF units further comprises an RF converter.

19. The method of claim 12 wherein the two RF units corresponding to any pair of receivers are separated from each other by a distance which is not greater than would allow said at least one other RF signal from said at least one user to be simultaneously received by said pair of receivers.