ESTIMATION OF CHANNEL IN OFDM WIRELESS CHANNEL USING LS AND MMSE TECHNIQUES

In recent years with the increase in digital data communication, the need for high data rates with less information loss or distortion is being a continuous research area and new techniques are being invented in this area. Large amount of people are using the air interface for proper communication which also have a lot of drawbacks which include multipath fading, Inter symbol interference (ISI), Doppler shift etc..This paper is being presented on basis of channel estimation of wireless mobile OFDM channels using known pilot symbols. Channel estimation is a technique generally used to design a channel in a particular environment based on the variation of known symbols which are inserted in the input at transmitter end and examined at the receiver end. Based on the received data various algorithms are used to compare the input and output data symbols to effectively estimate an OFDM channel. Out of many algorithms used in channel estimation we used LS (Least Square) and MMSE (Minimum Mean Square Error) to estimate a channel and compared those two techniques.