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    OFDM

     

    » It stands for Orthogonal Frequency Division Multiplexing.

    » It is used for data transmission over radio broadcast channel and wireless communication channel.

    » For finite length of channel

        for finite length of channel
    The channel order l is known at the transmitter while h(k) are still unknown.The partial channel information,the particular transmission techniques is known as orthogonal frequency division modulation can be implemented at transmitter where T is symbol duration and sampling period.

    ofdm is frequency response of channel h(kT).

     

    ORTHOGONALITY:

    The peak of each signal concides with through of other signals.

     

    Principle:

    Basic Idea: Channel bandwidth divided into multiple subchannels to reduce ISI and frequency selective fading.

    Multicarrier Transmission: Subcarriers are orthogonal to each other in frequency domain.

    Time Domain Spreading: Spreading is achieved in time domain by repeating the same information in a OFDM symbol on two different jb bands .

    Frequency Domain Spreading: Spreading is achieve by choosing congugate symmetric input for input to IFFT.

     

          FDS

    Theory: The baseband OFDM signal can be written as .

     image 3

     

    Cont....