Microwave Backhaul System Having a Double Capacity Link

• US 20130136039A1
• Filed: 09/25/2012
• Published: 05/30/2013
• Est. Priority Date: 11/30/2011
• Status: Active Grant

• Current Assignee: Maxlinear Asia Singapore Pte Ltd. (Maxlinear Incorporated)
• Original Assignee: Kobi Sturkovich
• Inventors: Sturkovich, Kobi, Kushnir, Igal
• Granted Patent: US 9,106,415 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04B 1/26 for superheterodyne receivers multiple frequency-changing H03D7/16
• CPC Class Codes: H04B 1/56 with provision for simultaneous communication in two directions
• CPC Class Codes: H04B 17/13 of power amplifiers, e.g. gain or non-linearity
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/368 adaptive predistortion
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

An all outdoor communication unit (ODU) microwave backhaul system and a split ODU microwave backhaul system, each configured to support a dual channel wireless link, are provided. Each microwave backhaul system includes an ODU having a processor configured to improve a quality of data (having a first and a second communication channel) by performing mathematical manipulation techniques on the data, a conversion, block configured to perform digital-to-analog and analog-to-digital conversions of the data, and a duplexer configured to facilitate substantially simultaneous communication of the first and second communication channels over the dual channel wireless link by optimizing a frequency separation between the first and second communication channels. Each microwave backhaul system also includes a modem assembly, located at either the ODU or at an indoor communication unit (IDU), which is configured to substantially simultaneously drive the first and second communication channels over the dual channel wireless link.

Claims

1. An outdoor communication unit (ODU) for implementation within an all ODU microwave backhaul system, comprising:

a dual channel modem assembly configured to modulate/demodulate data that is to be communicated over a dual channel wireless link, wherein the data comprises a first communication channel and a second communication channel;

a processor configured to improve a quality of the data by performing mathematical manipulation techniques on the data;

a filter configured to attenuate frequencies of the data that are higher than a to-determined cutoff frequency;

a single conversion block configured to perform digital-to-analog and analog-to-digital conversions of the data,

wherein the dual channel modem assembly is further configured to substantially simultaneously drive the first and second communication channels through the single conversion block and over the dual channel wireless link; and

a duplexer configured to facilitate the substantially simultaneous communication of the first and second communication channels over the dual channel wireless link by optimizing a frequency separation between the first and second communication channels.

2. The outdoor communication unit (ODU) of claim 1, wherein the dual channel modem assembly is configured to support at least one of:

an Ethernet service, a time-division multiplexing (TDM) service, and a control data that is aggregated over a radio link.

3. The outdoor communication unit (ODU) of claim 1, wherein the mathematical manipulation techniques performed by the processor include at least one of a pre-distortion process and an adaptive digital pre-distortion process.

4. The outdoor communication unit (ODU) of claim 1, wherein the dual channel wireless link has a link capacity that is approximately double a capacity of a wireless link associated with a conventional all ODU configuration.

5. The outdoor communication unit (ODU) of claim 4, wherein each of the first and second communication channels are configured to support an approximately 112 MHz wide channel, and wherein the dual channel modem assembly is further configured to support a constellation of at least approximately 2048 quadrature amplitude modulation (QAM).

6. The outdoor communication unit (ODU) of claim 1 wherein the filter is at least one of a low-pass filter and a pre-emphasis filter.

7. The outdoor communication unit (ODU) of claim 1, wherein the duplexer is configured to ensure that communication of the first and second communication channels over the dual channel wireless link satisfies European Telecommunications Standards Institute (ETSI) standards by substantially eliminating LO leakage, image problems, intermodulation between the first and second communication channels, continuous wave (CW) interference, and noise floors.

8. The outdoor communication unit (ODU) of claim 1, wherein the first and second communication channels are communicated over the dual channel wireless link according to at least one of:

an asymmetric transmission option, a symmetric transmission and a low IF transmission option.

9. A split outdoor communication unit (ODU) microwave backhaul system, comprising:

an indoor communication unit (IDU), having a modem assembly and an N-Plexer, configured to perform modulation/demodulation of data and to perform a conversion of the data, wherein the data comprises a first communication channel and a second communication channel;

an outdoor communication unit (ODU), having a processor, a conversion block and a duplexer, configured to facilitate substantially simultaneous communication of the first and second communication channels over a dual channel wireless link; and

a dual channel communication pathway, communicably coupled between the IDU and the ODU, configured to communicate the data between the IDU and the ODU over two communication channels,

wherein the modem assembly is further configured to substantially simultaneously drive the first and second communication channels over the dual channel communication pathway and over the dual channel wireless link.

10. The split ODU microwave backhaul system of claim 9, wherein the processor is configured to improve a quality of the data by performing at least one of a pre distortion process and an adaptive digital pre-distortion process.

11. The split ODU microwave backhaul system of claim 9, wherein the duplexer is configured to optimizes a frequency separation between the first and second communication channels prior to communication of the first and second communication channels over the dual channel wireless link.

12. The split ODU microwave backhaul system of claim 9, wherein the dual channel wireless link has a link capacity that is approximately double a capacity of a wireless link associated with a conventional split ODU configuration.

13. The split ODU microwave backhaul system of claim 11, wherein the duplexer is further configured to ensure that communication of the first and second communication channels over the dual channel wireless link satisfies European Telecommunications Standards Institute (ETSI) standards by substantially eliminating LO leakage, image problems, intermodulation between the first and second communication channels continuous wave (CW) interference, and noise floors.

14. The split ODU microwave backhaul system of claim 9, wherein the modem assembly is configured to support channel bonding by combining two or more network interfaces to increase throughput.

15. The split ODU microwave backhaul system of claim 9, wherein the modem assembly is configured to support at least one of single chip cross polarization interference cancellation (XPIC), multiple-input and multiple-output (MIMO) spatial multiplexing, and radio optimized network planning.

16. The split ODU microwave backhaul system of claim 9, wherein the modem assembly is configured to support at least one of a multiple-input and multiple-output (MIMO) spatial multiplexing technique and a radio optimized network planning technique.

17. A method of communicating two communication channels over a dual channel wireless link, comprising:

receiving, at an outdoor communication unit (ODU), data having a first communication channel and a second communication channel;

modulating/demodulating the data;

performing a mathematical manipulation technique on the data to improve a quality of the data;

converting the data from an analog domain to a digital domain;

upconverting the data to RF;

optimizing a frequency separation between the first and second communication channels; and

communicating the first and second communication channels substantially simultaneously over the dual channel wireless link, from a common antenna.

18. The method of claim 17, wherein the modulating/demodulating is performed by a dual channel modem assembly located at the ODU, and wherein the dual channel modem assembly is configured to substantially simultaneously drive the first and second communication channels through a single conversion block and over the dual channel wireless link.

19. The method of claim 17, wherein the modulating/demodulating is performed by a modem assembly located at an indoor communication unit (IDU), and wherein the modem assembly is configured to substantially simultaneously drive the first and second communication channels over a dual channel communication pathway, coupled between the IDU and the ODU, and over the dual channel wireless link.

20. The method of claim 17, wherein the mathematical manipulation technique includes at least one of a pre-distortion process and an adaptive digital pre-distortion process and a filtering process.