Abstract:
To minimize the degradation in system performance caused by the channel, channel estimation must be performed to remove the effects of the channel. To aid the channel estimation process, known pilot subcarriers are embedded into each OFDM symbol and used by the receiver to measure the channel.
This Study will take into account different channel conditions, and try to illustrate their effects on the channel estimation algorithms that will be used, and figure out which appropriate algorithm must apply for each case.
First it’s introduces how subcarrier permutation is applied in mobile WiMAX, and given a brief description of its types and modes. Then the estimation process in each modes will be discussed and analysed to compare between them in different channel condition
