tags:

views:

97

answers:

1
+1  Q: 

half-sine pulse shaping

hi, i wanted to know what is the pulse shape of the modem.oqpskmod? and if it is not half-sine pulse shape, how is it possible to make it half-sine pulse shape as it is stated in ieee 802.15.4(zigbee) standard where it shows it as follows

    p(t)=sin(pi*t/2*Tc) if 0<=t<=2Tc
    p(t)=0 if otherwise

? thanks a lot!

A: 

Looks to me like the MATLAB modems just output the symbols and that you will need to manually upsample (zero-stuff) the symbols and apply a pulse-shaping filter of your choice to the result to get your baseband signal. There's an example here: http://www.mathworks.com/access/helpdesk/help/toolbox/comm/ug/a1067963807.html#a1068239783b1

 2010-03-29 13:47:13

related questions

Algorithm to filter/normalise bad signal
c/c++ FFT library with non GPL license
Which algorithm should I use for signal (sound) one class classification?
Detecting the fundamental frequency
Java for Audio Processing is it Practical?
Tone Generation in Cocoa Touch
Low pass filter software?
Note onset detection
Can I do band filtering easily with DirectSound? If not, how can I do it?
How do I process the microphone input in real-time?
Downsampling and applying a lowpass filter to digital audio
What is the simplest way to continuously sample from the line-in using C#
How does a DSP/FPGA phase accumulator work?
Creating sine or square wave in C#
Bandlimited waveform generation
Fast fourier transform in c#
VB FFT - stuck understanding relationship of results to frequency
Saturating Addition in C
Integrating gyro and accelerometer readings
Any good recommendations for MP3/Sound libraries for java?
Beats per minute from real-time audio input
Music - How do you analyse the fundamental frequency of a PCM or WAC sample
Software Phase Locked Loop example code needed
What Are High-Pass and Low-Pass Filters?
C/C++ library for reading MIDI signals from a USB MIDI device