bv_cvxbook_extra_exercises

Explain in detail how to solve this problem using

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Unformatted text preview: and communications 12.1 FIR low-pass filter design. Consider the (symmetric, linear phase) finite impulse response (FIR) filter described by its frequency response N ak cos kω, H (ω ) = a 0 + k=1 where ω ∈ [0, π ] is the frequency. The design variables in our problems are the real coefficients a = (a0 , . . . , aN ) ∈ RN +1 , where N is called the order or length of the FIR filter. In this problem we will explore the design of a low-pass lter, with specifications: • For 0 ≤ ω ≤ π/3, 0.89 ≤ H (ω ) ≤ 1.12, i.e., the filter has about ±1dB ripple in the ‘passband’ [0, π/3]. • For ωc ≤ ω ≤ π , |H (ω )| ≤ α. In other words, the filter achieves an attenuation given by α in the ‘stopband’ [ωc , π ]. Here ωc is called the filter ‘cutoff frequency’. (It is called a low-pass filter since low frequencies are allowed to pass, but frequencies above the cutoff frequency are attenuated.) These specifications are depicted graphically in the figure below. H (ω ) 1.12 1.00 0.89 α 0 −α0 π/3 ωc ω π For parts (a)–(c), explain how to formulate the given problem as a convex o...
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This note was uploaded on 09/10/2013 for the course C 231 taught by Professor F.borrelli during the Fall '13 term at University of California, Berkeley.

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