OFDM Comb-Type Channel Estimation using a MMSE Estimator
نویسنده
چکیده
Orthogonal frequency division multiplexing (OFDM) is a keytechnique for wireless communication because of its robustness for narrow band interference, frequency selective fading and spectral efficiency. Channel estimation and equalization in OFDM is necessary in order to nullify the effect of impairments induced by the frequency selective fading channel. A frequency domain comb typepilot assisted channel estimation has been implemented for the channel estimation purpose. Modified Minimum Mean Square Error (MMSE) estimator is considered for estimation of the channel at pilot subcarriers. The performance and complexity comparison is made between the modified MMSE and MMSE estimator for fast fading Rayleigh channel. Linear, Low Pass and spline cubic interpolation techniques have been used with the proposed modified MMSE estimator. The effect of increase in number of channel taps on the performance of both estimators has been studied.
منابع مشابه
Hsieh and Wei: Channel Estimation for OFDM Systems Based on Comb-Type Pilot Arrangement in Frequency Selective Fading Channels CHANNEL ESTIMATION FOR OFDM SYSTEMS BASED ON COMB-TYPE PILOT ARRANGEMENT IN FREQUENCY SELECTIVE FADING CHANNELS
In this paper, the channel estimation methods for OFDM systems based on comb-type pilot sub-carrier arrangement are investigated. The channel estimation algorithm based on combtype pilots is divided into pilot signal estimation and channel interpolation. The pilot signal estimation based on LS or MMSE criteria, together with channel interpolation based on piecewise-linear interpolation or piece...
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تاریخ انتشار 2013