DQPSK transmitter : complex multiplication

[Patrick]

Hello everybody,

Does anyone knows how to produce the DQPSK mapping at the
transmitter...

I use for DBPSK : DBPSK_Out = data XOR DBPSK_out_previous

And at the receiver I used the following complex multiplication :
Dot = I(k).I(k-1) + Q(k).Q(k-1)

What is the mapping for the DQPSK encoding
I will use Dot and Cross = I(k-1).Q(k)-I(k).Q(k-1) at the receiver to
demodulate the DQPSK datas...

Thanks for help...

 

[Jerzy]

Does anyone knows how to produce the DQPSK mapping at the
transmitter...

I use for DBPSK : DBPSK_Out = data XOR DBPSK_out_previous

And at the receiver I used the following complex multiplication :
Dot = I(k).I(k-1) + Q(k).Q(k-1)

What is the mapping for the DQPSK encoding
I will use Dot and Cross = I(k-1).Q(k)-I(k).Q(k-1) at the receiver to
demodulate the DQPSK datas...

I think that DOT != CROSS

Maybe I could help, but I don't understand your last sentence.

Jerzy Gbur