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An MMSE channel estimation algorithm based on the conjugate gradient method for OFDM systems
Shigenori Kinjo 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this report, we propose a new scheme in order to implement an MMSE channel estimator for OFDM systems. We know that the time domain maximum likelihood estimator (MSE) can achieve highly accurate impulse response estimation by using a time domain long preamble of an OFDM frame. On the other hand, the impulse response estimation based on the minimum mean square error (MMSE) criterion can achieve superior channel estimation in low SNR conditions; however, it requires prior statistical information such as delay profiles of channels. In addition, the computational complexity becomes large because of the inverse matrix calculation. In order to overcome these implementation issues, we propose to estimate the statistical values based on the observed information of the channel. In addition, we show that we can suppress the increase of the computational complexity for the matrix inverse calculation by applying the conjugate gradient method while achieving the same performance with the ideal MMSE estimator.
A Design of FIR Filter Using CSD with Minimum Number of Registers
Suzuki, Kenichi,Ochi, Hiroshi,Kinjo, Shigenori 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
This paper proposes an algorithm to be used for VLSI design of FIR filter using a canonical signed digit (CSD) representation with a minimum number of registers. The coefficients represented by CSD have a common digit pattern, so that they can reduce the number of adders to calculate same digit patterns. The proposed method takes advantage of this technique without using more registers than that of the transfer function.