Modulation scheme with multiple phases and a two amplitudes?

Green Xenon [Radium] wrote:
> Eric Jacobsen wrote:
> 
> 
>> Duh, I mean 2^1B amplitudes, (2^1B)/2, etc....reversed the
>> relationship there...
> 
> 
> In the '2^1B', does the 'B' stand for the bit-resolution?

Sorry, I should've realized the that B stands for billion.

My bad.

Green Xenon [Radium] wrote:
> Eric Jacobsen wrote:
> 
> 
>> You can do it with *one* if you have log2(1B) amplitudes. 
> 
> 'One' of what?
> 
>> *Two* if you
>> have log2(1B)/2, *four* with log2(1B)/4, amplitudes, etc., etc.
> 
> "Two" and "four" of what?

Once again, I apologize for responding without reading properly. The 
'one', 'two', and 'four' are the amounts of phases.

Sorry for the annoyance cause by the above response.

Eric Jacobsen wrote:


> On Sat, 17 May 2008 15:55:02 -0700, "Green Xenon [Radium]"
> <glucegen1@excite.com> wrote:


>> Let's say I am using QAM and want a baud-rate of only 
>> 1-symbol-per-second but I want there to be 1-billion-bits-per-symbol. 
>> How many phases do I need?


> 
> You can do it with one if you have log2(1B) amplitudes.   Two if you
> have log2(1B)/2, four with log2(1B)/4, amplitudes, etc., etc.   With
> QAM you can encode information in both the phase and the amplitude.


If I have log2(1B) phases, I need only one amplitude. Right?