Transmission system of digital radio information using repeaters while minimizing data transfer latency

• US 8,731,030 B1
• Filed: 03/20/2012
• Issued: 05/20/2014
• Est. Priority Date: 03/20/2012
• Status: Expired due to Fees

• Current Assignee: REMEC Broadband Wireless Networks LLC (Moseley Associates, Inc.)
• Original Assignee: Remec Broadband Wireless LLC (Moseley Associates, Inc.)
• Inventors: McDonald, Patric Wood, Bowman, Charles Wayne
• Primary Examiner(s): FILE, ERIN M
• Application Number:
  US13/425,403
• Time in Patent Office: 791 Days
• Field of Search: 375/211
• US Class Current: 375/211
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04L 25/20 Repeater circuits; Relay circuits

Abstract

The method for transmission a set of digital data is provided. The method comprises: (A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site. The received signal includes a microwave carrier, whereas the processing compensates the received microwave signal for degradation due to propagation between the preceding site and the processing site. The method further comprises the step (B) of conditioning the received microwave signal for subsequent transmission from the processing site to a subsequent site.

Claims

1. A method for transmission a set of digital data comprising:

(A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

(A1) down converting said received signal having said microwave carrier frequency from said received microwave frequency to a first intermediate frequency;

(A1,

     1) processing said down converted signal having said first intermediate frequency by using a processing mode selected from the group consisting of;

an analog mode having a minimum latency; and

a digital mode;

(A1,

     2) processing said down converted signal having said first intermediate frequency by using said digital processing mode selected from the group consisting of;

a digital filter mode having an intermediate latency; and

a digital reconstruction mode having a maximum latency;

and

(B) conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

2. A method for transmission a set of digital data comprising:

(A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

(A1) down converting said received signal having said microwave carrier frequency from said received microwave frequency to a first intermediate frequency;

(A1,

     1) processing said down converted signal having said first intermediate frequency by using a processing mode selected from the group consisting of;

an analog mode having a minimum latency; and

a digital mode;

(A1,

     4) automatically switching between said analog and digital processing modes in at least one said repeater hub at a timing point at which a noise floor of said received signal (RSL) has reached a critical noise level;

wherein said received signal (RSL) having said critical noise level is processed by using a digital processing mode;

and

(B) conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

3. A method for transmission a set of digital data comprising:

(A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

(A1) down converting said received signal having said microwave carrier frequency from said received microwave frequency to a first intermediate frequency;

(A1,

     1) processing said down converted signal having said first intermediate frequency by using a processing mode selected from the group consisting of;

an analog mode having a minimum latency; and

a digital mode;

(A1,

     5) using an AGC method to select said analog processing mode having said minimum latency;

wherein said analog mode is replaced by a digital mode if an AGC voltage derived from said Outdoor Unit (ODU) reaches a critical value;

and

(B) conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

4. A method for transmission a set of digital data comprising:

(A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

(A1) down converting said received signal having said microwave carrier frequency from said received microwave frequency to a first intermediate frequency;

(A1,

     1) processing said down converted signal having said first intermediate frequency by using a processing mode selected from the group consisting of;

an analog mode having a minimum latency; and

a digital mode;

(A1,

     6) using an Indoor Unit (IDU) signal processing unit to select said digital filter processing mode having an intermediate latency by measuring a Means Squared Error (MSE) parameter;

and

(B) conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

5. A method for transmission a set of digital data comprising:

(A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

(A1) down converting said received signal having said microwave carrier frequency from said received microwave frequency to a first intermediate frequency;

(A1,

     1) processing said down converted signal having said first intermediate frequency by using a processing mode selected from the group consisting of;

an analog mode having a minimum latency; and

a digital mode;

(A1,

     7) using an Indoor Unit (IDU) signal processing unit to select said digital reconstruction processing mode having a maximum latency by measuring a Bit/Packet Error parameter;

and

(B) conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

6. A method for transmission a set of digital data comprising:

(A) processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

(A1) down converting said received signal having said microwave carrier frequency from said received microwave frequency to a first intermediate frequency;

(A1,

     1) processing said down converted signal having said first intermediate frequency by using a processing mode selected from the group consisting of;

an analog mode having a minimum latency; and

a digital mode;

(A1,

     8) monitoring at least one parameter of said down converted microwave signal having a first intermediate frequency by an assigned Indoor Signal Processing unit (IDU);

wherein said parameter is selected from the group consisting of;

Carrier-to-Noise (C/N);

a Constellation Mean Squared Error (MSE); and

a Packet/Bit error;

and

(B) conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

7. The method of claim 6;

wherein said step (A1,

     8) further comprises;

(A1, 8,

     1) if said at least one parameter is within the predetermined range, selecting said analog processing mode and performing an analog filtering and level restoration of said of down converted microwave signal having said first intermediate frequency and converting said filtered and having restored level signal having said first intermediate frequency to a second intermediate frequency for forwarding to a transmitter.

8. The method of claim 6;

wherein said step (A1,

     8) further comprises;

(A1, 8,

     2) if said at least one parameter is outside said predetermined range, selecting a digital processing mode to digitally correct a degraded received signal.

9. The method of claim 6;

wherein said step (A1,

     8) further comprises;

(A1, 8,

     3) if said degraded received signal is digitally corrected;

switching said repeater from said digital processing mode back into said analog processing mode having said minimum latency.

10. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein said means (A) further comprises;

(A2) a digital down converter configured to down convert said received signal having said microwave carrier frequency to a first lower intermediate frequency;

wherein said digital down-converter block is selected from the group consisting of;

a digital filter block having an intermediate latency; and

a digital reconstruction block having a maximum latency;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

11. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein said means (A) further comprises;

(A4) a switching block configured to automatically switch between an analog and a digital processing modes in at least one said repeater hub depending on whether a noise floor of said received signal (RSL) has reached a critical level;

wherein said received signal (RSL) having said critical noise level is processed by using a digital processing mode;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

12. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein said means (A) further comprises;

(A5) an Automatic Gain Control (AGC) block configured to select an analog processing mode having a minimum latency by measuring a Means Squared Error (MSE) parameter;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

13. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein said means (A) further comprises;

(A6) an Indoor Unit (IDU) configured to select a digital filter processing mode having an intermediate latency by measuring a Means Squared Error (MSE) parameter;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

14. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein said means (A) further comprises;

(A7) an Indoor Unit (IDU) configured to select a digital reconstruction processing mode having a maximum latency by measuring a Means Squared Error (MSE) parameter;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

15. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein said means (A) further comprises;

(A8) an Indoor Unit (IDU) configured to monitor at least one parameter of said down converted signal having said first intermediate frequency;

wherein said at least one parameter is selected from the group consisting of;

Carrier-to-Noise (C/N);

a Constellation Mean Squared Error (MSE); and

a Packet/Bit error;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

16. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein an analog processing block is selected; and

wherein said means (A) further comprises;

(A10) a converter block configured to convert said filtered and having restored level signal having said first intermediate frequency to a second intermediate frequency for forwarding to a transmitter;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.

17. An apparatus for transmission a set of digital data between at least two sites comprising:

(A) a means for processing a received signal transmitted from a preceding site by at least one repeater located in a repeater hub in a processing site;

said received signal having a microwave carrier;

wherein said processing compensates said received microwave signal for degradation due to propagation between said preceding site and said processing site;

said degradation caused by loss of amplitude of said microwave signal, or by frequency/phase dispersion of said microwave signal;

wherein a digital processing block is selected; and

wherein said means (A) further comprises;

(A11) a digital processing block configured to digitally correct a degraded received signal;

and

(B) a means for conditioning said received microwave signal for subsequent transmission from said processing site to a subsequent site.