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Automatic identification of the digital modulated signals is a rapidly evolving area. It has found wide applications in many areas, and with the rapid growing of radio communication technologies, a concept of software defined radio (SDR) has been introduced to integrate wireless applications working over any air interface and protocol. SDR can provide the standard communication platforms for adaptive receiver. In order to realize the adaptive receiver, it is required to identify the digital modulation of a signal.
the use of wavelet transform for modulation identification of digital signals without the need for any prior knowledge of the modulated signal parameters; the wavelet transform can effectively extract the transient characteristics in a digital communication signal, yielding distinct patterns for simple identification. The proposed digital modulation identifier consists of two subsystems: At the first subsystem, the type of modulation is obtained, which is called inter-class identifier and the second subsystem obtains the order of modulation within single class, which is called intra-class identifier. The inter-class identifier firstly, distinguishes three groups of signals; these groups include the signals that have the same features in wavelet domain of the PSK signal, QAM signal and FSK signal respectively. Then two sub-identifiers are used to distinguish the first group signals (M-ary ASK, M-ary PSK and OQPSK) and third group signals (M-ary FSK and MSK). Then by already knowing the order of PSK modulation, an identifier is proposed to discriminate the DPSK and PSK signals. The intra-class identifier consists of two identifiers, one for M-ary PSK signals and the other for M-ary FSK signals.
The performance of all proposed approaches must be evaluated using MATLAB and if it possible to implement it using FPGA.
I can help in this work as a have this system written in Matlab!!!!!
also I have an idea about design a copletely reconstructed transciever even its internal circuitry by using its current radio u can generate a new radio and this is wireless modification this can be implemented using FPGA
in truth i did a survay about this idea and i do not found any one up to now did this idea.
The idea in more details is that the trans. can be core reconstructed completely in the run time not at the manufacturer location but by a device that is designed to do this gob for certain application. The reconstruction includes even the modulation type! (This mean, processor reconstruction) moreover the other data that needed for that application, hence; the trans. can be reusable many times for different applications without the need to fabricate other trans., and this will save money and time enormously. The flexibility and the abilities provided in the FPGA enable us to design such trans. in less hardware components and costs.
In simple words,
"Building other processor, test it, program it as a new trans. and put it in service by using the old processor and finally release or shutting down the old processor by using this new processor". :idea:
if u have code of Robust Digital Signal Identifier for SDR plz send me i will be very thankful aaamir.zia@gmail.com is my email address
as i am doing similar project
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