US 2017/0257833 A1 · SIGNAL DETECTION FROM DIGITAL INTERFACE

Abstract

A digital receiver is provided. The digital receiver includes an oscillator that generates an oscillating signal at a selected frequency, and a complex mixer, coupled to the oscillator and configured to receive samples of a wideband signal from a digital interface. The complex mixer moves a signal of interest in the wideband signal to baseband. The digital receiver also includes at least one filter, coupled to the complex mixer, that down-samples the baseband signal to a narrowband signal and an output, coupled to the at least one filter, that is adapted to output the narrowband signal for analysis.

Claims26

Dependent claims

A digital receiver, comprising:

an oscillator that generates an oscillating signal at a selected frequency;
a complex mixer, coupled to the oscillator and configured to receive samples of a wideband signal from a digital interface, wherein the complex mixer moves a signal of interest in the wideband signal to baseband;
at least one filter, coupled to the complex mixer, that down-samples the baseband signal to a narrowband signal;
an output, coupled to the at least one filter, that is adapted to output the narrowband signal for analysis;
and
at least one scaling block coupled between the at least one filter and the output. wherein the at least one scaling block dynamically scales the narrowband signal provided to the output based on the incoming wideband signal.

3 more elements

A passive intermodulation tester, comprising:

at least one interface to communicatively couple the tester unit to a front-haul communication link used for communicating front-haul data to a remote radio head (RRH) having one or more antenna ports;
a programmable processor, coupled to the interface, configured to execute software, wherein the software is operable to cause the tester to do the following:
identify at least one tone in at least one downlink band of the remote radio head, wherein potential PIM products may appear in at least one uplink band of the remote radio head in response to the identified at least one tone;
inject the identified at least one tone in the at least one downlink band of the remote radio head;
a digital receiver that receives a wideband signal on the at least one uplink band and tunes to a selected, narrowband, portion of the wideband signal that is associated with the potential PIM product;
and
wherein the software is further operable to record the existence of the potential PIM products when detected in an output of the digital receiver.

4 more elements

Dependencies are inferred from the claim text.

Signal detection from digital interface

Life of this patent

Signal detection from digital interface

Life of this patent

Abstract

Claims26