Quadrature Phase Shift Keying
Questions tagged [qpsk]
169 questions
1
vote
2 answers
Which is the correct equation for union bounds for non-standard QPSK?
This a not a typical QPSK where $\alpha \neq \beta$
My book gives me the following
$$
P_e
\leq
Q(\frac{2\alpha} {\sqrt{2 N_0}})
+
Q(\frac{2\beta} {\sqrt{2 N_0}})
+
Q(\frac{2\sqrt{\alpha^2 + \beta^2}} {\sqrt{2 N_0}})
$$
The following is my…
kile
- 131
- 3
1
vote
2 answers
IQ Mismatch and Image
I was reading the following paper about direct conversion receivers from TI: link.
In this paper they compare the performance of direct conversion and heterodyne receiver with IQ mismatch.
The paper says that heterodyne architecture performs better…
sarthak
- 303
- 1
- 11
0
votes
0 answers
Unable to decode QPSK
I am trying to decode QPSK data and these are the constellation and timing plots, what could be the reason for the non convergence of QPSK constellation
comspec
- 1
- 1
0
votes
1 answer
QPSK InPhase and Quadrature
I am new to DSP. Please bear with my question. In QPSK why are we multiplying InPhase (Odd Bit) with Cosine and Quadrature (Even Bit) with Sine wave in this QPSK formulae
$$ s \left( t \right) = I \left( t \right) \cos\left(2 \pi f c t \right) − Q…
KJG
- 25
- 4
0
votes
1 answer
Constellation diagram for QPSK modulation
I need to plot (in MATLAB R2011a) constellation diagram of a QPSK modulated signal after AWGN was added to the signal. My current MATLAB code looks like this:
b=round(rand(1, Nbits));
fill=10; …
Emir
- 103
- 1
- 2