The future wireless mobile communication systems are expected to provide ubiquitous,high-quality, and high-rate mobile multimedia transmission.However, hostile multipath fading radio conditions give rise to serious inter-symbol interference (ISI); even worse,wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state.Orthogonal Frequency Dvision Multiplexing (OFDM), which is inherently resistant against ISI, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high-date-rate wireless communications.Notwithstanding, OFDM is much more vulnerable to errors of both channelestimation, and how to obtain correct channel estimation efficiently is highly critical to OFDM systems.The dissertation will focus on the aspects of OFDM systems mentioned above.Channel estimation technique is one of the key techniques in OFDM systems.Communication systems can enhance their BER performance by using coherence detection only when they could make precise and real-time estimation of fading coefficients of multipath channel.Recently, more and more researches are focused on channel estimation techniques of OFDM systems.According to the characteristics of various algorithms, we can classify them into three types:pilot-assisted channel estimation,blind and semi-blind estimation.In this paper, we study the production of the current estimation algorithms based on the introduction of the principle of wireless OFDM system.I study a new algorithm Based on the maximum likelihood and CP proposed by predecessor,then simulation and demonstration.

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