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Re: [Discuss-gnuradio] BPSK to QPSK
From: |
Mattias Kjellsson |
Subject: |
Re: [Discuss-gnuradio] BPSK to QPSK |
Date: |
Wed, 03 Mar 2010 16:15:58 +0100 |
User-agent: |
Thunderbird 2.0.0.23 (X11/20090817) |
Tom Rondeau wrote:
> On 3/3/2010 7:12 AM, Mattias Kjellsson wrote:
>
>> amarnath alapati wrote:
>>
>>
>>> hi everyone,
>>>
>>> I am using the programs of DIGITAL-BERT folder to see the bit
>>> error rate pattern versus the SNR. The given programs are for BPSK
>>> scheme. I tried to change it for QPSK Scheme. But seems that I did not
>>> do it right. I am giving the modified code in the programs . Please
>>> help me out......Thanking in advance....
>>>
>>>
>> I think that the Costas- and MM- blocks only work for differential
>> encoding... If anyone knows differently, speak now of forever hold your
>> peace ;p
>>
>> //Mattias
>>
>>
>
>
> No, the synchronization schemes are not dependent on the type of
> encoding. They will work for either differential or non-differential. In
> fact, they are really overkill for differentially encoded modulations....
>
> Tom
>
>
Hum... I'm glad to hear that, although I thought that the pi- phase
ambiguity of Costas- loops made them unsuitable for QPSK-
constellations... But I guess there is something I'm missing in the code
then?
Come to think of it. As stated in "Practical Costas loop design, J
Feigin", one can track the carrier, but there is a chance that the
carrier will come out of the loop "upside down". Are there blocks that
check for this?
BR
//Mattias
Re: [Discuss-gnuradio] BPSK to QPSK, Johnathan Corgan, 2010/03/03