The effect of hand around the antenna of a digital transceiver

Started by ytach in comp.dsp13 years ago 14 replies

Hello Guys, I have built a basic DBPSK transceiver and I was verifying the implementation when I found out that when I put my hand on the...

Hello Guys, I have built a basic DBPSK transceiver and I was verifying the implementation when I found out that when I put my hand on the antenna, the signal error rate goes up big time. My question to you guys, is it possible to implement a basic DBPSK transceiver with no error correction or equalization or AGC and yet can sustain the multipath and attenuation effect of placing hand around the...


HIPERLAN/2 PHY layer simulator on Matlab

Started by Hany in comp.dsp17 years ago 10 replies

Thanks Laki, ur answer could be right if I apply the effect of the channel to the signal then i add the noise, but what i do is adding the...

Thanks Laki, ur answer could be right if I apply the effect of the channel to the signal then i add the noise, but what i do is adding the noise efect first then applying the channel effect to the sum (signal+noise), to get channel*(signal+noise), so after equalization i'd have ---> (channel*(signal+noise))/channel -- > signal+noise. hope u got what i mean .! thanks alot Laki


Blind Channel phase offset recovery

Started by Ali A Nasir in comp.dsp12 years ago 27 replies

Hi! I have implemented blind equalization technique like CMA (Constant Modulus Algorithm) and Dispersion Minimization algorithm but they...

Hi! I have implemented blind equalization technique like CMA (Constant Modulus Algorithm) and Dispersion Minimization algorithm but they are working only for real channel taps. Can anyone tell me that if the channel taps are complex i.e. channel is introducing phase offset, then how we can implement blind phase offset recovery ? I would be grateful if someone could hint me ab...


Question about Reed-Solomon error control code

Started by Anonymous in comp.dsp16 years ago 2 replies

Hi, I am simulating equalizer with Reed-Solomon channel code a frequency fading channel. The fading channel has a severe spectral null, I...

Hi, I am simulating equalizer with Reed-Solomon channel code a frequency fading channel. The fading channel has a severe spectral null, I use frequecy domain equalization to contre the null. At present I think the equalizer works well. When I add the RS(170,180) (8 bit) channel code for a data frame, I find the BER performance is not improved at all. It is even worse a little bit than that o...


SOVA soft-output for the coded bits

Started by psidemus in comp.dsp7 years ago 3 replies

Hi All, I have a question regarding convolutional code SOVA soft output. I'm implementing a SOVA decoder as part of a Turbo-Equalization...

Hi All, I have a question regarding convolutional code SOVA soft output. I'm implementing a SOVA decoder as part of a Turbo-Equalization effort. The standard SOVA algorithm provides soft-output per uncoded bit. However, In conjunction with a turbo-equalizer I have to produce a modified soft-output version, this time per coded bit (as opposed to the standard soft output per uncoded bit), ...