simulation of DPSK communication link

[cheeki]

Dear Charan
I need your help in simulation of DPSK communication system. i am presently doing masters in communication system and this is my first assignment dont know from where to start. Please help me as much as u can. the details of the project are as under:
>data rate 2400bps
> >sampling frequency 48000 Hz
> >carrier ferquency 9600Hz
> >modulation scheme DPSK
> >signalling frame format 4 bytes of preamble for synchronization and rest
> >76 bytes of data.
> >need to generate 10 frames of the tX signal
> >have to compute PSD
> >
> >channel is :
> >
> >1AWGN SNR =0 to 12 db in steps of 1 db
> >2 narrow band rayleigh fading channel
> >doppler spread 10Hz, SNR =0 to 40 db in step of 5 db
> >narrowband ricean fading channel
> >doppler spread : 10 HZ
> >ricean factor: 1
> >SNR =0 to 40 db in stes of 5 db
> >
> >CHANNEL TASK:
> >
> >1 generatiion of releigh /ricean fading envelopes using the white gausian
> >noise filtering method for both the specified doppler spread and SNR
>values
> >, as well as for the required ricean factor.
> >for the doppler filter, 10th order filter should be employed
> >2 multiplicative baseband mixing using in phase and quadrature phase
>mixing
> >methods
> >2 PSD computation of the fading envelops for both rayleigh and ricean
> >fading.
> >
> >RX specification :
> >
> >1 DPSK receiver type but with coherent demodulation
> >2 Batch processing: the RX algorithm should be designed to process only a
> >batch of 512 samples of the Recveived signal at a time.
> >
> >RX TASK:
> >
> >1 initial synchronization
> >2 symbol synchronization DLL is prefered
> >Carrier recovery via a second order digital phase
locked loop
> >it shall be kind of you if you help me in this regard.
> >

[charan langton]

Hello,

This is certainly a very complex task for a first project! Your teacher is expecting a lot or perhaps you've not been going to your classes.

Anyway, this is very big project containing many aspects of a communications link, modulation, synchronization, medium characteristics, phase locks, framing and so on. What are you using to simulate this? Matlab m-files, simulink? SPW what?

The simulation is greatly dependent on the program you use. Each software has its own way of creating the blocks and the signals.

Also which part of the simulation is giving you most trouble?
Is the theoretical underpinning of all these topics clear to you? You can only do communications simulation if you understand clearly the theory of communications.

Charan Langton

[cheeki]

dear charan,
this is my firstr month in the masters in communication and signal processing . i need your help in knowing more about communication . please help me in the project of simulation of DPSK communication link by using matlab . matlab functions can be used
best regards
cheeki