Broad Band PLC
Broad Band PLC - PLC with higher data rates but shorter distance
In Broad Band Power Line Communication (BB PLC) multiple carrier frequencies in the range of 1.8 MHz to 70 MHz are used to transmit data. In the widely used standards HomePlug AV respectively IEEE 1901 the Orthogonal Frequency Division Multiplexing (OFDM) method is being used.
Subcategories of Broad Band PLC:
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With OFDM the user data is split into several data streams with lower data rate. Each of these lower rate data streams are then modulated by a conventional modulation scheme such as Quadrature Amplitude Modulation (QAM) with small bandwidth and after the modulation the RF signals are combined. At the end, this method results in a robust transmission system with high data rates. The data rates can be further boost up by increasing the QAM up to 4,096.
BB PLC can be divided as follows:
- HomePlug Green Phy
- HomePlug AV
- HomePlug AV2 / IEEE 1901 on two wires
- HomePlug AV2 / IEEE 1901 on three wires
If HomePlug Green Phy is used on radiating wires (means all wires except coaxial ones), the frequency range is limited to 2 MHz up to 28 MHz. The modulation scheme is fixed to QPSK, also referred to as 4-QAM. The data rate, which can be achieved with this method, is 9.8 Mbps on the line, which results in a user data rate of 5.6 Mbps UDP.
If HomePlug AV is used on radiating wires (means all wires except coaxial ones), the frequency range is limited to 2 MHz up to 28 MHz. The modulation scheme is dynamically adapted to the line conditions and varies from QPSK up to 1.024 QAM. With that the data rate on the line goes up to 200 Mbps, which results in a user data rate of about 95 Mbps UDP.
If HomePlug AV2 / IEEE 1901 is applied on two radiating wires, the frequency range from to 2 MHz up to 68.5 MHz is used. The modulation scheme is dynamically adapted to the line conditions and varies from QPSK up to 4.096 QAM. With that the data rate on the line goes up to 500 Mbps, which results in a user data rate of about 250 Mbps UDP.
HomePlug AV2 / IEEE 1901 applied on three wires does use the same frequency band like on two wires but deviant from the former 2 transmitters and 2 receivers are integrated into the chip and being used. The modulation scheme is dynamically adapted to the line conditions and varies from QPSK up to 4.096 QAM. With the dual transmit/receive on three wires the data rate goes up to 1,200 Mbps, resulting in a user data rate of about 500 Mbps UDP.
BB PLC can be applied and used on any kind of wires, independently if there is an AC voltage on the line or DC voltage present in order to supply other components connected to these wires or if these are dead wires.
The signal on the wires is been attenuated strongly by the relatively high frequencies which limits the reach. Reach and achievable user data rate are much dependent on the capacity of the wires.
In the area of BB PLC CODICO offers integrated circuits and modules according to HomePlug Green Phy Standard, HomePlug AV/AV2 Standard and according IEEE 1901 Standard.