Layered Division Multiplex (LDM) is an optional technology of the new ATSC 3.0 Physical Layer standard.
This two-layer technique allows ATSC 3.0 to address all receiving conditions (indoor, mobile, fixed) within a single channel This is a key benefit of ATSC 3.0 as it always providing the best trade-off in terms of robustness and capacity.
With the latest software upgrade now released, Vortex II now supports the LDM waveform modulation. Several pilot projects are planning to evaluate LDM in the real world. Among them there is the project sponsored by the National Association of Broadcasters (NAB) & the Consumer Technology Association (CTA) in Cleveland (OHIO – USA). The Comark transmitter there has been recently upgraded with a Vortex II and is now ready for field evaluation of LDM.