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Channel equalizer is a key component of WSN-OFDM (Wireless Sensor Networks Orthogonal Frequency Division Multiplexing) system. Traditional equalizer is mostly designed with LS algorithm, which comes with low precision in channel estimation. The previous LMMSE algorithm could reach a high accuracy, but it has high complexity and would consume high circuit resources as well. In order to improve precision of the channel equalizer with acceptable complexity, a fast LMMSE algorithm is proposed for channel estimation and equalization on the basis of LMMSE and DFT interpolation algorithm.The operation is simplified with the cyclic convolution properties and DFT properties.The FPGA verification results indicate that bits error ratio is only 2.3×10 when signal-to-noise ratio is 16dB,which is 89.8% lower than that of traditional LS equalizer, at the expense of 27.27% more circuit resources.

A Circuit Design of High-precision Channel Equalizer for WSN-OFDM System