DSP

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CORDIC for phase rotation

by Krishna Sankar on August 19, 2007

cordic_thetahat_phase_convergence

My understanding of the CORDIC (Co-ordinate Rotation by DIgital Computer) thanks to the nice article in [DSPGURU-CORDIC].

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Straight line fit using least squares estimate

by Krishna Sankar on July 15, 2007

least_squares_fit

Two points suffice for drawing a straight line. However we may be presented with a set of data points (more than two?) presumably forming a straight line. How can one use the available set of [...]

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Interpreting the output of fft() operation in Matlab

by Krishna Sankar on June 17, 2007

fft_complex_cosine

It might be interesting to interpret the output of the fft() function in Matlab. Consider the following simple examples. fsMHz = 20; % sampling frequency fcMHz = 1.5625; % signal frequency N = 128; % [...]

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First order digital PLL for tracking constant phase offset

by Krishna Sankar on June 10, 2007

first_order_pll

Considering a typical scenario where there might exist a small phase offset between local oscillator between the transmitter and receiver. Figure 1 : Transmitter receiver with constant phase offset In such cases, it might be desirable [...]

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Using Toeplitz matrices in MATLAB

by Krishna Sankar on April 21, 2007

The definition of Toeplitz matrix from [1] is: A matrix is said to be Toeplitz if the elements are determined completely by the difference .

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