multipath reception การใช้

Some multipath reception is momentary due to road vehicles or aircraft passing; other multiplath problems may persist due to reflection off tall buildings or other landscape features.
The New York market is uniquely problematic for multipath reception due to the large number of man-made obstacles which prevent adequate digital coverage of the entire city from the main broadcast facilities atop the Empire State Building . ( The proposed 1776-foot 2009 US DTV transition has already been completed .)
In the case of analogue television waveforms, for example, the picture content also has a bearing on the acceptable levels of system distortion . ( With TV pictures, phase ripple will give effects similar to ghosting or multipath reception, where low level multiple images are superimposed on the main picture.
Proponents of COFDM argue that it resists multipath far better than 8VSB . This is important property of the modulation for receiving HDTV in e . g . moving vehicles that is not possible with 8VSB . Early 8VSB MPH . The deficiencies in 8VSB in regards to multipath reception can be dealt with by using additional forward error-correcting codes which decreases the useful bit rate, such as that used by ATSC-M / H for Mobile / Handheld reception.