DSP

Repetition in Rate Matching
Hi All, I am looking into Rate Matching in UMTS. In de-Rate Matching (if this is the correct term), punctured bits I believe are replaced with 0. For repetition bits, if the inputs to the de-Rate Matching are soft bits (LLR), how do we combine the repeat bits or just discard one of the repeats? If we combine t... 24 Nov 2009 16:45

Review of a book
Hi All Does anybody have used the following book? Underwater Acoustics: A Linear Systems Theory Approach by Lawrence J. Ziomek. Is it worth buying it??? Many thanks. Chintan ... 24 Nov 2009 17:53

imresize in 3D
Hello, I want to resize an image from 3D smaller dimension to larger dimension. i.e for example from 40x40x30 to 40x120x90. The normal matlab function just resizes image in 2D. Thanks ... 25 Nov 2009 01:37

Modulation with a baseband signal in Matlab
Hi, I have a simple matlab question: I have a baseband signal with a 2MHz bandwidth (wideband), sampled at 100MHz. I would like to use this signal to modulate a 5Ghz carrier. What is the simplest way to proceed? I was thinking using the ammod function, but in that case I would need to resample my signal to a hi... 25 Nov 2009 21:42

Window and/or Filter - possibly naive question
In an *UNRELATED* post Chris Bore said: " The way I sometimes think of it, you choose a window function whose kernel best matches the shape that either you think the signal's spectrum has, or that you want the signal's spectrum to have. " My question --- Is there any ESSENTIAL difference between a "window" ... 22 Nov 2009 08:15

exponential algorithm
I need an algorithm for computing the exponential of a real number using only elementary operations (addition, subtraction, multiplication and/or division). I have a PLC (Programmable Logic Controller - used in industrial controls) as the processor. It has no built-in math functions other that the above. I need to co... 20 Nov 2009 19:04

Channel simulation in matlab
I am doing a simulation for channel coding algorithms for TETRA using matlab. I did a simulation with AWGN noise and plotted graphs for BER and MER vs Eb/No. But in the specification, the BER and MER are given for different fading channels, say TU50(Typical Urban at speed 50km/h) and HT200(Hilly Terrain at speed 200km/... 21 Nov 2009 22:30

Finding max and min amplitude of composite signal
Hi, Can some expert tell me the simplest method to find the max and min value of a composite signal. For eg. if it is given as, x(t) = sin(10*pi*t) + 2*cos(7*pi*t) + 3*sin(3*pi*t) I can find the max and min values using Matlab, however, is there a method to find it without using a software? Simply using a pe... 23 Nov 2009 10:42

Information Theory - Entropy: h(A U B)
On Nov 18, 5:33 pm, "Anand P. Paralkar" <anand.paral...(a)jmale.com> wrote: Hi, I am doing an introductory course to Information Theory where I have come across:   h(A) = -log(P(A)), where h(A) represents the quantity of information associated with the event A, with a probability P(A). Further... 20 Nov 2009 11:10

LDPC FADING
I simulate LDPC code over AWGN channel I need to simulate over fading channel How implement fading channel in matlab ? ad what is the modification require in my code ?   ... 21 Nov 2009 22:30