Abstract: A method is provided for aligning RF signals of a first channel bank and additional channel banks in a test platform. A plurality of correlators is used to correlate a reference code signal carrying a particular code at a particular chip rate with a received code signal carrying the particular code at the particular chip rate from the first channel bank to establish a first timing offset. The plurality of correlators is used to correlate a continuation of the reference code signal with additional received code signals carrying the particular code at the particular chip rate from the additional channel banks to establish additional timing offsets. The first timing offset and additional timing offsets are applied to the first and additional channel banks. The plurality of correlators includes at least 12 correlators, and a timing offset is established in a correlation interval having a shorter duration than the particular code.
Type:
Application
Filed:
October 17, 2016
Publication date:
February 2, 2017
Applicant:
Spirent Communications PLC
Inventors:
Neil Christopher Pearse, Steve Michael Moroz, Mark Geoffrey Holbrow
Abstract: A method is provided for aligning RF signals of a first channel bank and additional channel banks in a test platform. A plurality of correlators is used to correlate a reference code signal carrying a particular code at a particular chip rate with a received code signal carrying the particular code at the particular chip rate from the first channel bank to establish a first timing offset. The plurality of correlators is used to correlate a continuation of the reference code signal with additional received code signals carrying the particular code at the particular chip rate from the additional channel banks to establish additional timing offsets. The first timing offset and additional timing offsets are applied to the first and additional channel banks. The plurality of correlators includes 72 correlators, and a timing offset established in a correlation interval having a shorter duration than a length of the particular code.
Type:
Application
Filed:
August 15, 2014
Publication date:
February 18, 2016
Applicant:
Spirent Communications PLC
Inventors:
Neil Christopher Pearse, Steve Michael Moroz, Mark Geoffrey Holbrow
Abstract: An automated method is provided for suppressing spurious signals in a direct digital synthesized signal. To determine magnitudes of local oscillator (“LO”) feedthrough and image frequency signal components, a digitally synthesized RF signal is digitally analyzed. To reduce the magnitude of the LO feedthrough signal component for the LO feedthrough signal component, one or more first parameters of at least one digital-to-analogue converter is automatically adjusted following a first search pattern. To reduce the magnitude of image frequency signal component for the image frequency signal component, at least one second parameter of the at least one digital-to-analogue converter is automatically adjusted and at least one third parameter of a phase compensation network is automatically adjusted following a second search pattern. The automatically adjusting for the LO feedthrough signal component and for the image frequency signal component can be iterated.
Type:
Application
Filed:
August 15, 2014
Publication date:
February 18, 2016
Applicant:
Spirent Communications PLC
Inventors:
Neil Christopher Pearse, Steve Michael Moroz, Mark Geoffrey Holbrow