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Estimations of coherenee bandwidth from wideband ehannel sounding measurements made in the 30KHz-IOOMHz band in several indoor environments are described. Results are intended for applieations in high-capacity indoor powerline networks. The eoherence bandwidth and the RMS delay spread parameters are estimated from measurements of the complex transfer function of the Powerline Communications (PLC) channel. The 90th pereentile of the estimated coherence bandwidth at 0.9 correlation level is above 65.5 KHz and 90% of estimated va lues of 8 0.9 are below 691.5 KHz. 8 0.9 was observed to have a minimum value of 32.5 KHz. The RMS delay spread describes the dispersion in the time domain due to multipath transmission. 80 % of the channels exhibit an RMS delay spread between 0.06"s and 0.78"s. Its mean value was equal to 0.41311S. The paper studies the variability of the eoherence bandwidth and time-delay spread parameters with the ehannel dass 191, and thus with thc loeation of the receiver with respeet to the transmitter. And finally relates the RMS delay spread to the eoherence bandwidth, which in turn, affects the powerline channel capacity.

Advanced communication technologies has allowed the powerline communication (PLC) channel to be a transmission medium that enables the transferring of high-speed digital data over the classical indoor electrical wires. Nowadays, the 200 Mbits/s theoretical rates of the Homeplug AV specification are no still sufficient for transferring Internet, voice, HD videos, and data services simultaneously through the electrical support, especially as real data merely exceed 70 Mbits/s. In this note, a brief Electromagnetic Compatibility analysis and throughput calculation of the PLC systems is carried out. The frequency band up to 30 MHz, characterizing PLC modems, is here pushed up to 100MHz. The investigation is aimed to increase PLC throughputs by extending the frequency band above 30MHz.

-Powerline communication systems are used to trans mit audio and video transmissions with delay, datarate and QoS requirements. However, the Powerline medium is shared with other devices connected to any socket. When switching, and even du ring normal operation, these devices can generate so me noises (stationary, cyclo-stationary & impulsive). A good knowledge of these noises is essential to counter them and to ensure a fair quality of service. This study describes an new method to monitor impulsive noise, which tries to be very e10se to the mechanism of Powerline modems, so the impact of these noises is better evaluated

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