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There are characteristics of high noise, big attenuation, the big impedance variation and the uneven frequency response on low-voltage power line channel. Firstly, this paper proposes the combination the adaptive technology with the OFDM technology to realize the reliable and high-speed data transmission channel. It is a key to study the channel estimation of the OFDM technology and the channel allocation...
This paper presents a novel study of ultra wideband communication over household powerlines in a very high frequency band, from 50 MHz to 550 MHz. Adaptive modulation has been exploited on the Multiband-OFDM model for UWB over PLC system, the aim is to improve the system's data transmission error rate. By means of simulations, we compare the performance of adaptive and non-adaptive modulation over...
Minimum adaptive allocation algorithm (MAAA) is proposed for wide band low-voltage powerline communication based on the bit rate requirements and the subchannel gains. This paper presents an analytic model describing complex transfer functions of typical powerline communication. Four-paths attenuation and frequency selective fading are considered in simulation. Comparison have been made between the...
OFDM is the digital modulation scheme that multiplexes multiple orthogonal sub-carriers that are digitally modulated. One of the schemes that improve the performance of OFDM transmission is the sub-carrier adaptive modulation scheme. In order to perform sub-carrier adaptive modulation, it is necessary to transmit the allocation information of modulation schemes for each sub-carrier and this degrades...
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