Visible light communication (VLC) using LEDs has attracted significant attention recently for the future secure, license-free and electromagnetic-interference (EMI)-free optical wireless communication. Dimming technique in LED lamp is advantageous for energy efficiency. Color control can be performed in the red-green-blue (RGB) LEDs by using dimming technique. It is highly desirable to employ d...

This paper discusses a simple method of Peak to Average Power Ratio (PAR) reduction developed for system with WFMT modulation. The novel Wavelet based Filtered Multi-Tone (WFMT) modulation was proposed as an alternative of the Discrete Multi-tone line code for xDSL system and represents future extending of OFDM/ DMT technologies. Because of multicarrier nature of WFMT modulation, it is well sui...

To accommodate the demand of exponentially increasing global wireless traffic driven by coming beyond 5G and 6G, communication has stepped into millimeter wave (MMW) band to exploit large available bandwidth. The future application scenarios require systems with high speed, low cost, a small footprint simple configuration, integrated light source-based intensity modulation direct detection (IM-...

The energy efficiency of pulse-amplitude-modulated discrete multitone modulation (PAM-DMT) decreases as the modulation order of M-PAM modulation increases. Enhanced PAM-DMT (ePAM-DMT) was proposed as a solution to the reduced energy efficiency of PAM-DMT. This was achieved by allowing multiple streams of PAM-DMT to be superimposed and successively demodulated at the receiver side. In order to m...

Discrete multi tone (DMT) uses an inverse discrete fourier transform (IDFT) to modulate data on the carriers. The high side lobes of the IDFT filter bank can lead to spurious emissions (egress) in unauthorised frequency bands. Applying a window function within the DMT symbol alleviates this, but introduces distortions that are generally not easy to compensate for. In this paper a special class ...

Transmission capacity and receiver sensitivity of an intensity-modulation direct detection (IM-DD) optical discrete multi-tone (DMT) system can be improved by using the probabilistically shaping (PS) technique. However, different probabilistic distributions will required owing to unbalanced signal-to-noise ratio (SNR) among data-carrying subcarriers (SCs) induced imperfect frequency response op...

This work discusses the characteristics of a multicore processor to perform DMT/OFDM modulation, while eventually executing other concurrent tasks. The DMT modulation is of special interest because it has been adopted in several communication systems. As a case study, the TMS320C6670 is adopted, which has a (I)FFT coprocessor. The use of these coprocessors can be essential to make a DMT/OFDM fe...

In existing DMT (discrete multi-tone) systems with adaptive bit allocation a deterioration of the transmission channel may lead to increased bit error rates, and even to the loss of connection. In most cases this disturbed channel would allow a stable transmission using a new bit allocation (possibly with reduced data rate), after a further initialization phase. We propose dynamic adaptive DMT ...

We present a comparative study of the capacity increase brought by bitand power-loading discrete multi-tone (DMT) modulation for low-cost colorless transmitters. Three interesting reflective semiconductor optical amplifier (RSOA) based colorless transmitter configurations are compared: First, an amplified spontaneous emission (ASE) spectrum-sliced source; second, a self-seeded RSOA fiber cavity...

An alternative receiver structure is presented for discrete multitone (DMT)-based systems. The usual structure consisting of a (real) time domain equalizer (TEQ) with a (complex) 1-taps frequency domain equalizer (FEQ) per tone, is modiied into a structure with a (complex) multitaps FEQ per tone. By solving an MMSE problem, the SNR is maximized for each tone separately. This always results in a...