Differential QPSK encoder/decoder. More...

#include <dqpsk.h>

Public Member Functions
	dqpsk ()

complex< long >	encode (complex< long > c)

complex< long >	decode (complex< long > c)

complex< long >	convbits (int sym)

int	qpsk_sym (complex< long > c)

Public Attributes
int **	datbase

int	previous_encoded_symbol

int	previous_decoded_symbol

Detailed Description

Differential QPSK encoder/decoder.

Encode/Decode the input bits into quaternary qpsk format

Author: Tony Kirke

Constructor & Destructor Documentation

SPUC::dqpsk::dqpsk ( )

Differential encoding/decoding of QPSK Encode/Decode the input bits into quaternary qpsk format

References datbase, previous_decoded_symbol, and previous_encoded_symbol.

Member Function Documentation

complex< long > SPUC::dqpsk::convbits ( int sym )

Convert integer symbol (0-3) back to binary pair

Referenced by decode(), and encode().

complex< long > SPUC::dqpsk::decode ( complex< long > c )

Differential decoder

References convbits(), datbase, previous_decoded_symbol, and qpsk_sym().

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complex< long > SPUC::dqpsk::encode ( complex< long > c )

Call qpsk_sym to get equivalent symbol value (0-3) of current input bit pair Get current output symbol (0-3) from encoding data base[curr symbol][prev encoded symbol] Call convbits to convert current encoded symbol to bit pair Previous encoded symbol = current encoded symbol

References convbits(), datbase, previous_encoded_symbol, and qpsk_sym().

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