Hello, I'm designing some communication system for space communication. I need to use spread spectrum. What are considerations for parameters value? For example: pseudo random sequence length, the period until the pattern start to repeat itself.... Thanks.
direct sequence spread spectrum parameter consideration
Started by ●July 16, 2013
Reply by ●July 16, 20132013-07-16
On Tue, 16 Jul 2013 10:06:54 -0700 (PDT), bezenchu@gmail.com wrote:>Hello, > >I'm designing some communication system for space communication. >I need to use spread spectrum. >What are considerations for parameters value? >For example: pseudo random sequence length, the period until the pattern start to repeat itself.... > >Thanks.What class is this for? Did the Prof. provide any guidance? Eric Jacobsen Anchor Hill Communications http://www.anchorhill.com
Reply by ●July 16, 20132013-07-16
On 7/16/2013 12:06 PM, bezenchu@gmail.com wrote:> Hello, > > I'm designing some communication system for space communication.Sounds wonderful.> I need to use spread spectrum. > What are considerations for parameters value? > For example: pseudo random sequence length, the period until the pattern start to repeat itself....I am building Space Shuttle here. It uses diodes. Is 1N914 good diode for Space Shuttle?
Reply by ●July 16, 20132013-07-16
On 7/16/2013 2:58 PM, Vladimir Vassilevsky wrote:> On 7/16/2013 12:06 PM, bezenchu@gmail.com wrote: >> Hello, >> >> I'm designing some communication system for space communication. > > Sounds wonderful. > >> I need to use spread spectrum. >> What are considerations for parameters value? >> For example: pseudo random sequence length, the period until the >> pattern start to repeat itself.... > > I am building Space Shuttle here. It uses diodes. Is 1N914 good diode > for Space Shuttle?I have some experience with the 1N914 diode, but not in a Space Shuttle application. The part I'm really worried about is that they retired the Space Shuttle. Are you building your *own* Space Shuttle again? You know what happened the last time you tried to launch an extra-terrestrial vehicle... Do you really want to have *that* happen again? Tsk, tsk, tsk. -- Rick
Reply by ●July 16, 20132013-07-16
It's not for a class but for some project they I'm doing On Tuesday, July 16, 2013 9:31:08 PM UTC+3, Eric Jacobsen wrote:> On Tue, 16 Jul 2013 10:06:54 -0700 (PDT), bezenchu@gmail.com wrote: > > > > >Hello, > > > > > >I'm designing some communication system for space communication. > > >I need to use spread spectrum. > > >What are considerations for parameters value? > > >For example: pseudo random sequence length, the period until the pattern start to repeat itself.... > > > > > >Thanks. > > > > What class is this for? Did the Prof. provide any guidance? > > > > > > Eric Jacobsen > > Anchor Hill Communications > > http://www.anchorhill.com
Reply by ●July 16, 20132013-07-16
>Hello, > >I'm designing some communication system for space communication. >I need to use spread spectrum. >What are considerations for parameters value? >For example: pseudo random sequence length, the period until the patternstart to repeat itself....> >Thanks. >If you found this group, you should know how to read, type, and find a search engine. There is tons of information out there on DSSS and applications. Take a look. _____________________________ Posted through www.DSPRelated.com
Reply by ●July 16, 20132013-07-16
- Coding gain / chip rate - PN code: Do you want two (e.g., a Gold code and Walsh code) or just one? (For space, probably just a Gold code.) Length of code, auto/cross-correlation properties of code, code generator polynomial(s). - Carrier freq - Antenna gain
Reply by ●July 16, 20132013-07-16
On Tue, 16 Jul 2013 12:30:43 -0700 (PDT), bezenchu@gmail.com wrote:>It's not for a class but for some project they I'm doingTop posting really jacks up the ability to read a thread. Why do you need to use spread spectrum? If you can find the reason why spread spectrum is required you may find the answers to many of your questions. If there's no reason, then you can choose to do it almost any way. It's unlikely anyone here knows the reason, so it's hard to say what the parameters should be. Is the data rate very low?>On Tuesday, July 16, 2013 9:31:08 PM UTC+3, Eric Jacobsen wrote: >> On Tue, 16 Jul 2013 10:06:54 -0700 (PDT), bezenchu@gmail.com wrote: >> >> >> >> >Hello, >> >> > >> >> >I'm designing some communication system for space communication. >> >> >I need to use spread spectrum. >> >> >What are considerations for parameters value? >> >> >For example: pseudo random sequence length, the period until the pattern start to repeat itself.... >> >> > >> >> >Thanks. >> >> >> >> What class is this for? Did the Prof. provide any guidance? >> >> >> >> >> >> Eric Jacobsen >> >> Anchor Hill Communications >> >> http://www.anchorhill.com >Eric Jacobsen Anchor Hill Communications http://www.anchorhill.com
Reply by ●July 16, 20132013-07-16
On Tuesday, July 16, 2013 12:06:54 PM UTC-5, beze...@gmail.com wrote:> Hello, I'm designing some communication system for space communication. I need to use spread spectrum. What are considerations for parameters value? For example: pseudo random sequence length, the period until the pattern start to repeat itself.... Thanks.Your questions suggest a basic lack of DSSS knowledge. I suggest you look at two books: Spread Spectrum Communications, vol 1 & vol 2 by Marvin K. Simon, et. al. Digital Communications with Space Applications by Solomon W. Golomb, et. al.
Reply by ●July 16, 20132013-07-16
I'm confused... Does "jacks up" mean improves or messes with? "Jacking up the gain" just means turn it up which is often a good thing. I'm not sure I've heard the term "jack up" in a negative way. Rick On 7/16/2013 4:15 PM, Eric Jacobsen wrote:> On Tue, 16 Jul 2013 12:30:43 -0700 (PDT), bezenchu@gmail.com wrote: > >> It's not for a class but for some project they I'm doing > > Top posting really jacks up the ability to read a thread. > > Why do you need to use spread spectrum? If you can find the reason > why spread spectrum is required you may find the answers to many of > your questions. > > If there's no reason, then you can choose to do it almost any way. > > It's unlikely anyone here knows the reason, so it's hard to say what > the parameters should be. > > Is the data rate very low? > > >> On Tuesday, July 16, 2013 9:31:08 PM UTC+3, Eric Jacobsen wrote: >>> On Tue, 16 Jul 2013 10:06:54 -0700 (PDT), bezenchu@gmail.com wrote: >>> >>> >>> >>>> Hello, >>> >>>> >>> >>>> I'm designing some communication system for space communication. >>> >>>> I need to use spread spectrum. >>> >>>> What are considerations for parameters value? >>> >>>> For example: pseudo random sequence length, the period until the pattern start to repeat itself.... >>> >>>> >>> >>>> Thanks. >>> >>> >>> >>> What class is this for? Did the Prof. provide any guidance? >>> >>> >>> >>> >>> >>> Eric Jacobsen >>> >>> Anchor Hill Communications >>> >>> http://www.anchorhill.com >> > > Eric Jacobsen > Anchor Hill Communications > http://www.anchorhill.com-- Rick
