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As an important solution to “the last mile” access, digital subscriber loops (DSLs) are still maintained in a huge plant to support low-cost but high-quality broadband network access through telephone lines. The discrete multi-tone (DMT) transmissions constitute a baseband version of the ubiquitous orthogonal frequency division multiplexing. While the DMT is ideally suited to deal with the frequency...
In this paper, we present experimental results on optical wireless transmission using commercially available phosphorescent white-light LEDs. To the best of our knowledge, we demonstrate for the first time visible-light links operating at transmission rates up to 200 Mb/s over typical room distances and at reasonable bit-error-ratios. The experiments were performed using optical filtering at the receiver...
Two new constellations, non-rectangular QAM (NQAM) and snail shift keying are introduced to replace the rectangular QAM constellation for discrete multi-tone modulation. The major property of these schemes is their non-symmetric configurations where demands of subscribers can be prioritised conveniently. These constellation algorithms, compared to well-known QAM modulation especially NQAM with the...
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