SPUC::qpsk

SPUC::qpsk Class Reference
[Communication Classes, Examples]

A QPSK receiver that can operate at exactly 2 samples/symbol. More...

#include <qpsk.h>

Collaboration diagram for SPUC::qpsk:

[legend]List of all members.


Public Member Functions
long	I_data ()
long	Q_data ()
complex< long >	data ()
long	carrier_loop ()
long	symbol_loop ()
long	symclk (void)
void	clock (complex< long >adc_out)
	qpsk (void)
Public Attributes
a_d	ADC
loop_filter< long >	carrier_loop_filter
loop_filter< long >	symbol_loop_filter
complex< long >	prev_sam
complex< long >	prev_sym
complex< long >	decision
long	carrier_loop_out
long	symbol_loop_out
long	symbol_clk
long	symbol_clk_pls
long	sample_clk
long	symbol_x2_clk
long	symbol_x2_clk_pls
carrier_nco	c_nco
fir< complex< long > >	rcv_sqrt_rc
delay< complex< long > >	hard_decision_delay
delay< complex< long > >	final_baseband_delay
delay< complex< long > >	timing_disc_delay
long	bpsk
long	dec_rate_log
long	carrier_error
long	symbol_nco_out
complex< long >	hard_decision_prev
complex< long >	final_baseband_prev
complex< long >	baseband
complex< long >	resampled
complex< long >	carrier_in
complex< long >	carrier_nco_out
complex< long >	mf_in
complex< long >	mf_out
complex< long >	final_baseband
long	timing_error
long	nda_timing_error
complex< long >	hard_decision

Detailed Description

A QPSK receiver that can operate at exactly 2 samples/symbol.

A QPSK receiver that can operate at exactly 2 samples/symbol to illustrate carrier phase locked loop and demod process see qpsk_variable for more comprehensive example.

Constructor & Destructor Documentation

SPUC::qpsk::qpsk ( void )

alpha = 0.35 root raised cosine fir

Member Function Documentation

long SPUC::qpsk::carrier_loop ( ) [inline]

void SPUC::qpsk::clock ( complex< long > adc_out )

Don't use NDA timing discriminator
Down conversion
Digital Interpolation/Resampling would go here
Processing at 2 times the symbol rate
input to matched filter & does calculation
Slicer - get sign bit prior to rounding!
Symbol rate processing
Matched Filter out
Symbol discriminator
Carrier discriminator
Symbol + timing loop filters