Modified Channel Estimation Techniques for DCT based OFDM Systems

In the field of Wireless Communication many advancements are developed in past decade. The main requirements of are high data rates quality of service (QOS). In this paper Orthogonal Frequency Division Multiplexing (OFDM) is designed using discrete cosine transforms (DCT). The channel estimation techniques of Least Square (LS) and Minimum mean square error (MMSE) are analyzed with the help of DCT kernel matrix of DCT based OFDM systems. We will also compare the results of estimation techniques of DCT OFDM systems with the DFT based OFDM systems. It is required to investigate on DCT-OFDM system for better performance. The DCT-OFDM mainly concentrate on disposal of between block and intercarrier obstruction at a similar guard grouping overhead, contrasted and DFT-OFDM. DCT-based OFDM requires just a large portion of the subcarrier dispersing of OFDM, in this way permitting to twofold the quantity ofsubcarriers inside a similar data transmission