itpp::Spread_2d Class Reference

Spreading of complex symbols to complex output. More...

#include <itpp/comm/spread.h>

Public Member Functions
	Spread_2d ()
	Constructor.
	Spread_2d (const vec &incodeI, const vec &incodeQ)
	Constructor.
void	spread (const cvec &symbols, cvec &out)
	Spreading of signal.
cvec	spread (const cvec &symbols)
	Spreading of signal.
void	despread (const cvec &rec_signal, cvec &out, int timing)
	Despreading of signal. timing is the start position of the first symbol, given in number of samples.
cvec	despread (const cvec &rec_signal, int timing)
	Despreading of signal. timing is the start position of the first symbol, given in number of samples.
void	set_code (const vec &incodeI, const vec &incodeQ)
	Set the in-phase and the quadrature-phase spreading codes.
vec	get_codeI ()
	Returns the in-phase spreading code.
vec	get_codeQ ()
	Returns the quadrature-phase spreading code.
int	get_period ()
	Get the period of the code (length of code vector).

Protected Attributes
Spread_1d	spreadI
Spread_1d	spreadQ

Detailed Description

Spreading of complex symbols to complex output.

The spreading are done independently for the I and Q phases. That is real(symbols) are spread by the incodeI and imag(symbols) are spread by incodeQ.

Before despreading the phase should be corrected, that is the complex baseband signal should be multiplied by exp(j*PHIk), where PHIk is the phase of that user (and path).

Obeserve that the spreading is normalized so that the energy per bit is preserved before and after spreading (that is each symbol is multiplied with 1/sqrt(N)). Hence, for the multicode case the energy is normalized for one symbol (code) but the transmitted signal consist of a sum of several signals.

Example: See Spread_1d

Definition at line 152 of file spread.h.

Member Data Documentation

Spread_1d itpp::Spread_2d::spreadI

protected

The spreaders for the I and Q channels respectively

Definition at line 183 of file spread.h.

Referenced by despread(), get_codeI(), set_code(), and spread().

Spread_1d itpp::Spread_2d::spreadQ

protected

The spreaders for the I and Q channels respectively

Definition at line 183 of file spread.h.

Referenced by despread(), get_codeQ(), set_code(), and spread().

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The documentation for this class was generated from the following files:

• itpp/comm/spread.h
• itpp/comm/spread.cpp