hopping sequence

[schizo2]

How to create a hopping sequence in labview.????

[Ben]

please define "hopping sequence".

Taking a guess...

Search on State Diagram on this site for something that may help.

Ben

[schizo2]

Hopping sequence is used in frequency hopping spread spectrum by a signal to hop to a new frequency..In FHSS we mutlipy FSK modulated signal with the hopping sequence so tht fsk modulated signal shud jump to the new frequency

[Jason_D]

schizo2,

What hardware are you using to acquire this sequence?  I understand you are using LabVIEW but do you have any additional toolkits like the Modulation Toolkit or Spectral Measurements Toolkit.  Have you seen any of these articles: Frequency Hopping/Sweeping, Discussion forum on Bluetooth?

[schizo2]

Well i m using TMS320c6416t. and  yes i m using MODULATION toolkit as well. and yes i have checked both of the links and they didnt solve my problem

[Dan_K]

Hello schizo2,

The NI LabVIEW Modulation Toolkit is very useful when creating baseband or IF signals for generation with a arbitrary waveform generator or analyzing baseband or IF signals returned from a digitizer.

How exactly are you getting the waveforms generated from the toolkit to your device for generation? What format does the data need to be in? How are you controlling your device? What specific frequencies are you trying to generate?

The answers to these questions would be a beginning in attempting to answer your questions. More detail about the specific nature of your problem, what you've tried so far and where you are moving toward are very useful for these types of issues.

[schizo2]

Hello Dan,

 Well i have implemented the frequency hopping in SIMULINK. i created a logic and implemented easily in the simulink. Here the frequency base is 5.7khz and the frequency jumps after every 512 hz.i have used NCO aslo called DDFS to generate frequencies. the frequency hopping block is created by using Pn sequence and converting the binary no to intergers then multiplying the integer with the jump which is equal to 512 and then added with the base frequency which is 5700.it will give u the next frequency to hop on. for example if we get the interger 3.we multiply it by 512 i.e 3*512 + 5700 =723. so how to implement this logic in labview?

[Doug_L._Bear]

The logic to generate your hopping frequency is quite easy in LabVIEW (see picture).  I am not sure how you are interfacing with your device however, or what kind of data it takes in so I'm afraid I can't provide any more detail about getting data at this frequency into your device.