Hi: Which MFSK modem uses the most bits-per-symbol? Thanks
Which MFSK modem uses the most bits-per-symbol?
Started by ●May 27, 2009
Reply by ●May 27, 20092009-05-27
On May 27, 9:54 am, GreenXenon <glucege...@gmail.com> wrote:> Hi: > > Which MFSK modem uses the most bits-per-symbol? > > ThanksThe $B!g(BFSK modem, of course. John
Reply by ●May 27, 20092009-05-27
On May 27, 6:58 am, John <sampson...@gmail.com> wrote:> On May 27, 9:54 am, GreenXenon <glucege...@gmail.com> wrote:> > > Hi: > > > Which MFSK modem uses the most bits-per-symbol? > > > Thanks >> The $B!g(BFSK modem, of course.LOL. I was asking about one that actually exists -- not the theoretical maximum.
Reply by ●May 27, 20092009-05-27
On May 27, 10:59 am, GreenXenon <glucege...@gmail.com> wrote:> On May 27, 6:58 am, John <sampson...@gmail.com> wrote: > > > On May 27, 9:54 am, GreenXenon <glucege...@gmail.com> wrote: > > > > Hi: > > > > Which MFSK modem uses the most bits-per-symbol? > > > > Thanks > > > The $B!g(BFSK modem, of course. > > LOL. I was asking about one that actually exists -- not the > theoretical maximum.Then I think you're asking the question to the notional person who knows of every M-FSK modem that has ever been produced. If he/she exists, I'm not sure that they read comp.dsp. Alternatively, I can make a really high M FSK modem in MATLAB, just as long as there is no noise. Jason
Reply by ●May 27, 20092009-05-27
On May 27, 11:46 am, cincy...@gmail.com wrote:> On May 27, 10:59 am, GreenXenon <glucege...@gmail.com> wrote: > > > On May 27, 6:58 am, John <sampson...@gmail.com> wrote: > > > > On May 27, 9:54 am, GreenXenon <glucege...@gmail.com> wrote: > > > > > Hi: > > > > > Which MFSK modem uses the most bits-per-symbol? > > > > > Thanks > > > > The $B!g(BFSK modem, of course. > > > LOL. I was asking about one that actually exists -- not the > > theoretical maximum. > > Then I think you're asking the question to the notional person who > knows of every M-FSK modem that has ever been produced. If he/she > exists, I'm not sure that they read comp.dsp. > > Alternatively, I can make a really high M FSK modem in MATLAB, just as > long as there is no noise. > > JasonActually, as M increases you care less about noise in the sense that required Eb/No to achieve target BER decreases. A question for stupidents would be what constrains M? There are some HF standards that use M=16, maybe higher. John
Reply by ●May 27, 20092009-05-27
cincydsp@gmail.com wrote:> On May 27, 10:59 am, GreenXenon <glucege...@gmail.com> wrote: >> On May 27, 6:58 am, John <sampson...@gmail.com> wrote: >> >>> On May 27, 9:54 am, GreenXenon <glucege...@gmail.com> wrote: >>>> Hi: >>>> Which MFSK modem uses the most bits-per-symbol? >>>> Thanks >>> The ∞FSK modem, of course. >> LOL. I was asking about one that actually exists -- not the >> theoretical maximum. > > Then I think you're asking the question to the notional person who > knows of every M-FSK modem that has ever been produced. If he/she > exists, I'm not sure that they read comp.dsp. > > Alternatively, I can make a really high M FSK modem in MATLAB, just as > long as there is no noise. > > JasonDon't confuse bits/symbol with symbols/bit. Jerry -- Engineering is the art of making what you want from things you can get. ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Reply by ●May 27, 20092009-05-27
On May 27, 5:07�pm, Jerry Avins <j...@ieee.org> wrote:> > Don't confuse bits/symbol with symbols/bit.I hate being beat to the punch, but at least I can use different words: if you assume Es/No is constant, Eb/No drops proprotional to log2(M). I've worked on M=256 (wireless) systems. I think some optical systems have M=1024 modes. Most (well, many) protocols now vary M based on signal quality. Darrell
Reply by ●May 27, 20092009-05-27
"John" <sampson164@gmail.com> wrote in message news:4cf90138-de4e-45d0-90f5-2ab1a61ef445@r34g2000vba.googlegroups.com...> On May 27, 11:46 am, cincy...@gmail.com wrote: >> On May 27, 10:59 am, GreenXenon <glucege...@gmail.com> wrote: >> >> > On May 27, 6:58 am, John <sampson...@gmail.com> wrote: >> >> > > On May 27, 9:54 am, GreenXenon <glucege...@gmail.com> wrote: >> >> > > > Hi: >> >> > > > Which MFSK modem uses the most bits-per-symbol? >> >> > > > Thanks >> >> > > The $B!g(BFSK modem, of course. >> >> > LOL. I was asking about one that actually exists -- not the >> > theoretical maximum. >> >> Then I think you're asking the question to the notional person who >> knows of every M-FSK modem that has ever been produced. If he/she >> exists, I'm not sure that they read comp.dsp. >> >> Alternatively, I can make a really high M FSK modem in MATLAB, just as >> long as there is no noise. >> >> Jason > > Actually, as M increases you care less about noise in the sense that > required Eb/No to achieve target BER decreases. A question for > stupidents would be what constrains M?Exactly. Look at BER vs SNR and it becomes very clear that Jason's statement is practical. As long as noise and distortion are minimized one can use high M.> There are some HF standards that use M=16, maybe higher.I don't know about FSK, but for QAM M = 64 is common in wireless systems. Much beyond that and the RF electronics get expensive in a hurry. Cable systems go higher routinely.
Reply by ●May 27, 20092009-05-27
On May 27, 3:39 pm, Darrell <darrel...@gmail.com> wrote:> I've worked on M=256 (wireless) systems. I think some optical systems > have M=1024 modes. Most (well, many) protocols now vary M based on > signal quality.So 1024-FSK is the most bits-per-symbol for MFSK currently-available?
Reply by ●May 27, 20092009-05-27
On May 27, 7:25�pm, GreenXenon <glucege...@gmail.com> wrote:> On May 27, 3:39 pm, Darrell <darrel...@gmail.com> wrote: > > > I've worked on M=256 (wireless) systems. �I think some optical systems > > have M=1024 modes. �Most (well, many) protocols now vary M based on > > signal quality. > > So 1024-FSK is the most bits-per-symbol for MFSK currently-available?1024FSK? The highest I've seen is 64FSK in a system called WJST. John
