MPH (ATSC)

MPH or Mobile-Pedestrian-Handheld is the trademark of a modification of the 8VSB modulation system used for transmission of digital television using the ATSC system. The modification addresses a constraint of conventional ATSC transmission, in that reliable reception is difficult or impossible when the receiver is moving. The technology was jointly developed by LG and Harris. The name is a wordplay on MPH, the ubiquitous (in the U.S.) acronym for miles per hour.

The MPH system is a multiple-stream approach, with the main service stream for existing DTV and HDTV services, and the MPH stream for one or more mobile, pedestrian, and/or handheld services. Key attributes of the MPH system include:

• Backward compatibility with the existing ATSC 8VSB transmission and receiving equipment
• Capability to receive broadcast signals at high (mobile) speed with a single antenna
• Use of small handheld receivers without the need for multiple antennas
• Power savings in handheld receivers
• Flexibility in both data rates and robustness
• Data-rate efficiency
• Use of advanced video and audio coding

References

• , April 3, 2007.

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