Friday 15 June 2012

Wi-max technology


OFDM stands for Orthogonal Frequency Division Multiplexing .
OFDM technique is utilized in Wimax 802.16d and Wifi .
OFDM is a frequency division multiplexing technique with each career being orthogonal to each other .
In conventional FDM (frequency Division Multiplexing ) guard bands are required to prevent the interference so the spectrum is not fully utilized  ,and in OFDM as the signals are orthogonal with each other, no guard band is required and spectrum is fully utilized.
Other than efficient spectrum utilization, OFDM is used as a effective tool to overcome the multipath fading  , in this the sequential data is transferred  in parallel over a longer period of time ,so even if the data is received by the receiver directly and same data  with some reflection,the data over the certain period of time will be same and so data recieved will not be corrupted due to multipath reflection.

Conclusion : Advantage of OFDM is its spectrum efficiency and mutipath mitigation capability.

No comments:

Post a Comment