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OFDM Power Line MODEM

OFDM Power Line MODEM Solutions from Texas Instruments.

Block Diagram


AMP Codec DSP LDO1 LDO2 LDO3 Line Driver 1 Line Driver 2 Line Driver 3 MCU PWM Controller UART USB Driver

Design Considerations

With multiple AC power outlets in every room, residential power lines are already the most pervasive network in the world. However, communication on the AC power line is extremely difficult because of its unfavorable communication characteristics - specifically, line noise.

Rather than fighting through the noise, OFDM (Orthogonal Frequency Division Multiplexing) technology lets signals travel around the noise.

OFDM is a discrete multitone technology in which numerous signals of different frequencies, called carriers, are combined to form a single signal for transmission. Prior to combining, each carrier is first "phase shifted," or modulated, for the purpose of representing data bits. By modulating data bits on individual signals prior to combining them, many data bits can be transmitted over a small amount of time.

The result is a home network without having to install CAT-5 or other cabling.

Application Notes

  • Configuring Source of Multiple ePWM Trip-Zone Events (spraar4.htm, 8 KB)
    25 Oct 2007 Abstract
  • Interfacing SD/MMC Cards With TMS320F28xxx DSCs (spraao7.htm, 9 KB)
    26 Jul 2007 Abstract
  • TMS320TCI6482 EDMA3 Performance Data (spraag8.htm, 8 KB)
    30 Nov 2006 Abstract
    

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