Multistage Enhancement of Channel Quality Using Channel Estimation Techniques for Effective BER/SNR Using 16 QAM for Mobile Communication
In this paper the authors present an improved and robust channel estimation algorithm for OFDM mobile communication systems based on the use of pilot subcarriers. Specifically they present an iterative channel estimation technique to improve the performance of channel estimators. In iterative receiver structures, soft information becomes available after the decoding stage. This information is used to enhance the quality of the channel estimates for the next iteration. The low complexity proposed receiver including LMS algorithm, has a higher efficiency than conventional methods (without channel estimation, LS& LMMSE) and it can work in lower amount of SNRs.