Minimizing DC effects for channel estimation in LTE system

Channel estimation is critical to receiver performance in Orthogonal Frequency Division Multiplexing (OFDM) systems such as 3GPP Long Term Evolution (LTE) and 4G. According to the RS position definition of LTE, different antenna transmission mode of LTE has different offset for reference symbol (RS). So it directly impacts channel estimation performance and algorithm implementation of the around DC region. The paper proposes the method for mitigation of the DC effects by adjusting adaptively filter coefficient for range round DC region. Simulation performance shows that the proposed method enhances 1-2 dB performance as compared with traditional method when MMSE is used across the entire band [1-2]. However, the complex of computer of the proposed method is lower than the traditional method.