ABSTRACT
HomePlug audio, video AV employs PHY and MAC technologies that provide a 200 Mbps-class power line networking capability. The PHY operates in the frequency range of 2–28 MHz and uses windowed orthogonal frequency division multiplexing(OFDM) and a powerful turbo convolutional code (TCC) that provides robust performance within 0.5 dB of Shannon's limit. The in-home communications are established with the time division duplexing (TDD) mechanism to allow for symmetric communication between peers, as opposed to the classical access system in Asymmetric digital subscriber line (ADSL) which uses two different downstream and upstream throughputs. The HomePlug AV2 specification incorporates Multiple-input multiple-output (MIMO) capabilities with beamforming, which offers the benefit of improved coverage throughout the home, particularly for hard- to-reach outlets. Precoded spatial multiplexing or beamforming was chosen as the MIMO scheme, as it offers the best performance by adapting the transmission in an optimal way to the underlying eigenmodes of the MIMO PLC channel.
