In-Home Power Line Communications Local Area Network Based on Uniform Discrete Multitone Transceiver
Cyclic prefix based channel equalization employed in the Discrete Multi-Tone (DMT) modulation offers the advantage of simplified implementation. However, this method has the disadvantage of amplifying channel noise for channels having deep nulls in the frequency response. The in-home power line channel is one such channel that has high noise content, in addition to deep frequency nulls. Enhancement of channel noise degrades Bit Error Rate (BER), at the receiver. In order to improve the BER and the Signal-to-Noise Ratio (SNR), for the in-home power line channel, a novel Uniform DMT transceiver is proposed. It divides the channel spectrum into uniform bandwidth sub-bands, and allocates variable power to each sub-band, according to the modified Fischer's power loading algorithm.