Don these new modulation techniques like OFDM reduce or eliminate interference ?
While techniques like OFDM may change the distribution of radio energy across the radio band in use, it will not reduce interference. Consider this analogy. In a restaurant at a table next to you, if someone speaks loudly in English, and then changes to French or German, the voice still speaks at a certain volume and can interfere with your ongoing conversation at your table. Ignoring that the human brain can naturally block out foreign languages, different languages may change the tonal qualities, but the overall amplitude of the sound waves is still the same. BPL equipment designers are limited to an emission level of 30 uV/m at a distance of 30 meters. They are naturally going to run the highest power level possible on the line, staying withing this emission limit. The higher the signal level, the less repeaters are needed and it makes the system more economically viable. So, running different modulation schemes will result in the same 30 uV/m emissions level.
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