Bandwidth management system for a remote repeater network

• US 5,991,309 A
• Filed: 04/12/1996
• Issued: 11/23/1999
• Est. Priority Date: 04/12/1996
• Status: Expired due to Term

• Current Assignee: E F Johnson Company (JVC Kenwood Corporation)
• Original Assignee: E F Johnson Company (JVC Kenwood Corporation)
• Inventors: Jensen, Dana J., Lyon, James K., Pfiefer, Steven J., Dvorak, Mark D.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): VINCENT, DAVID ROBERT
• Application Number:
  US08/628,981
• Time in Patent Office: 1,320 Days
• Field of Search: 455/17, 455/20-21, 455/22, 455/45-48, 455/104, 455/109, 455/93, 455/103, 455/118, 455/114, 455/11.1, 455/16, 455/202-203, 455/313, 455/314, 370/492, 370/493, 370/494, 370/495, 370/319, 370/344
• US Class Current: 370/492
• CPC Class Codes: H04B 1/60 Supervising unattended repeaters
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

A bandwidth management system for a remote repeater network for modifying a first signal to create a second signal within the bandwidth of a communications link, transferring the second signal across the communications link, and reconstructing the first signal at the remote end of the communications link. The bandwidth management system featuring several mixing modes for performing the signal conversion and reconstruction. The system offering a calibration feature to correct for phase distortions introduced in reconstruction of the original signal. The calibration feature incorporating signals from a global positioning satellite system for reconstruction.

Claims

1. A communication system for a repeater network, comprising:

a first repeater site including;

a first multiplexer having a passband P;

a first microwave transceiver; and

a first frequency translation system translating first data signals outside of the passband P into second data signals within the passband P;

a second repeater site including;

a second multiplexer;

a second microwave transceiver; and

a second frequency translation system extracting the first data signals from the second data signals; and

wherein the second repeater site communicates with the first repeater site over a microwave link using the first microwave transceiver and the second microwave transceiver, and wherein the first data signals include subaudible control signals used in the repeater network.

2. The communication system of claim 1, wherein the first frequency translation system directly translates the first data signals.

3. The communication system of claim 1, wherein the second frequency translation system directly translates the second data signals.

4. The communication system of claim 1, wherein the first frequency translation system shifts a low frequency component upband of a high frequency component using a double sideband system and a high pass filter.

5. The communication system of claim 1, wherein the second frequency translation system shifts a low frequency component upband of a high frequency component using a double sideband system and a high pass filter.

6. The communication system of claim 1, wherein the first frequency translation system shifts a low frequency component upband of a high frequency component using a double sideband system and a bandpass filter.

7. The communication system of claim 1, wherein the second frequency translation system shifts a low frequency component upband of a high frequency component using a double sideband system and a bandpass filter.

8. The communication system of claim 1, wherein the first frequency translation system shifts a low frequency component upband of a high frequency component using a single sideband system.

9. The communication system of claim 1, wherein the second frequency translation system shifts a low frequency component upband of a high frequency component using a single sideband system.

10. The communication system of claim 1, wherein an external timing reference is used at the first repeater site and the second repeater site for substantially eliminating a phase error between mixing signals for deconversion.

11. The communication system of claim 10, wherein the external timing reference is a global positioning satellite signal has been inserted.

12. The communication system of claim 10, wherein a mixing signal at the second repeater site is phase offset as a function of a cumulative link delay to substantially reduce deconversion distortion between the first repeater site and the second repeater site.