Re: [Discuss-gnuradio] QPSK over air

[Tom Rondeau]

On Tue, Feb 25, 2014 at 3:04 PM, Martin Braun <address@hidden> wrote:
> On 02/25/2014 07:17 PM, Aditya Dhananjay wrote:
>> Hi Mark,
>>
>> The problem is that GNU Radio does not have equalizers that can perform
>> sufficiently well for constellations such as 64-QAM. As far as I know,
>> the only one present is a simple decision feedback equalizer.
>>
>> I'm working on implementing a few equalizers: a) 2D Triangulation, and
>> b) Whittaker-Shannon Sinc interpolator, and c) one of my own.
>>
>> These aren't yet ready to share, but once they are, I will send out an
>> email to the list.
>
> Yeah, that's a good point :)
> What we have in stock GR should work up to 8-PSK, but higher than that,
> they will probably be the limiting factor.
>
> M


The lms_dd_equalizer should work fine for any constellation, for some
definition of 'fine'.

Tom