hello sir,
This is vinay, I have purchased your latest book on digital communications using matlab 2nd edition , can you please write a code a matlab code on the following.
1)BER of QPSK over rayleigh channal
2) BER of QPSK over rician channal.
hello sir i want to ask u if u have any code using matlab or simulink about code shift keying modulation
i have been searching for any refrence or code about this type of modulation but could not find anything so plz can u help ?
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Yes, you can choose the same pseudo random sequence. But the difference is , in CSK cyclic shifts of the pseudo random sequence are used to modulate the data. K bits of input data are modulated using one of the cyclically shifted version of the pseudo random sequence. Actually it combines a form of M-ary orthogonal signaling and DSSS
do u have any idea how can i make a cyclic pn code using the pn sequence generator in simulink
iam facing a lot of problem while iam trying to shift the code to create a new code from it
if u can help me plz ill be thankfull
Hi Sir, I have gone through your book intensively, but i am working on msk. How different is the ber of msk from ber of qpsk?
if they are different, how can i plot the ber of msk with carrier frequency?
Hello Jerry,
MSK modulation is very similar to QPSK, OQPSK modulations. It can be interpreted as two BPSK-like modulator on I and Q channel, with one of them being shifted by half-symbol period and shaped by sinusoids. Hence the BER for MSK is identical to that of BPSK, which is given by
Second edition listed here is the latest. It is primarily intended for simulating fundamental blocks in digital communication systems. Filter design is very specific to signal processing and it is NOT covered in this ebook.
PM-QPSK (polarization mode QPSK) or DP-QPSK (dual Polarization QPSK) refer to the same technique. The names are used interchangeable in many texts.
Here, the laser beam is split into two polarizations (TE and TM modes) and each polarized signal is separately modulated using QPSK and then added together [1].
Many Thanks, you are helping me a lot. Can I ask you one more question please ? As you know after modulation the 16-QAM the output is 9 constellation points, so is there any way to get 9 points in every quarter(in Gray mapping) something like this way below
Best Regards
Hi,
I have read through the book and wondered how could I plot the channel throughput with the respect to the Shannon capacity in chapter 1.5? The code is not provided in the book. Looks like the formula for calculating the channel throughput is not declared neither.
Hi,
Thank you for the prompt reply.
Actually I was asking for how to plot the graph on page 30. And I thought the dots inside the Shannon limit were the corresponding channel throughput. Correct me if I am wrong. If possible, can I hav the code plz?
I bought this book from iTune one week ago. This book introduces simulation of communication systems from the beginning. It deeply attracts me. It includes digital communication, channel coding, inter-symbol interference, fading, digital modulations, OFDM and so on. This book covers all the basics of simulation of communication systems. I am hoping that authors can add some new technologies into it.
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