Power line communication apparatus and power line communication method
AssigneePanasonic Corporation
InventorsHisao Koga, Nobutaka Kodama
Life of this patent
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Abstract
A power line communication apparatus is provided with an auto gain detector that detects a gain fluctuation of an AGC (Auto Gain Control) circuit that automatically adjusts a gain of a received signal; a retry ratio calculator that calculates a ratio of retry based on output from an ARQ (Automatic Repeat request) unit that detects an error in the received data and issues a repeat request; and a transmission rate calculator that calculates a transmission rate based on output from a channel estimation unit that calculates a CNR so as to estimate a transmission status. A display displays a transmission status, including the detected AGC noise fluctuation, retry ratio, transmission rate and the like.
Claims16
A power line communication apparatus for receiving a signal currently being carried on a plurality of subcarriers via a power line, the power line communication apparatus comprising:
- a transmission line connecting unit that receives via the power line the signal having a plurality of subcarriers;
- a noise level calculator that calculates a noise level corresponding to each of the plurality of subcarriers;
- a determination unit that determines, according to the noise level, a modulation scheme employed for each of the plurality of subcarriers to assign a data volume per symbol to each of the plurality of subcarriers;
- a transmission rate calculator that calculates a transmission rate by calculating, according to the data volume assigned to each of the plurality of subcarriers, a total data volume per symbol resulting from all of said plurality of subcarriers, said symbol having a constant duration;
- and
- a display that displays the transmission rate in a number of bits per second.
An integrated circuit for receiving a signal via a power line, the signal being carried on a plurality of subcarriers, the integrated circuit comprising:
- a noise level calculator that calculates a noise level corresponding to each of the plurality of subcarriers;
- a determination unit that determines, according to the noise level, a modulation scheme employed for each of the plurality of subcarriers to assign a data volume per symbol to each of the plurality of subcarriers;
- a transmission rate calculator that calculates a transmission rate by calculating, according to the data volume assigned to each of the plurality of subcarriers, a total data volume per symbol resulting from all of said plurality of subcarriers, said symbol having a constant duration;
- and
- a display controller that displays on a display the transmission rate in a number of bits per second.
A power line communication method for communications via a power line, the power line communication method comprising:
- receiving via the power line a signal being carried on a plurality of subcarriers;
- calculating a noise level corresponding to each of the plurality of subcarriers;
- determining, according to the noise level, a modulation scheme employed for each of the plurality of sub carriers to assign a data volume per symbol to each of the plurality of subcarriers;
- calculating a transmission rate by calculating according to the data volume assigned to each of the plurality of subcarriers, a total data volume per symbol resulting from all of said plurality of subcarriers, said symbol having a constant duration;
- and
- displaying on a display the detected transmission rate in a number of bits per second.
Dependencies are inferred from the claim text.