itpp::Multicode_Spread_2d Class Reference

Multicode spreading of complex symbols to complex output. More...

#include <itpp/comm/spread.h>

Public Member Functions
	Multicode_Spread_2d ()
	Constructor.
	Multicode_Spread_2d (const mat &incodesI, const mat &incodesQ)
	Constructor.
cvec	spread (const cvec &symbols)
	Spreading of signal.
cvec	despread (const cvec &receivedsignal, int timing)
	Despreading of signal. timing is the start position of the first symbol, given in number of samples.
void	set_codes (const mat &incodesI, const mat &incodesQ)
	Set the spreading codes.
mat	get_codesI ()
	Return the matrix containing the in-phase codes (as rows)
mat	get_codesQ ()
	Return the matrix containing the quadrature-phase codes (as rows)
int	get_period ()
	Returns the spreading factor.

Protected Attributes
Multicode_Spread_1d	mcspreadI
Multicode_Spread_1d	mcspreadQ

Detailed Description

Multicode 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 247 of file spread.h.

Member Function Documentation

void itpp::Multicode_Spread_2d::set_codes	(	const mat &	incodesI,
		const mat &	incodesQ
	)

Set the spreading codes.

The codes are given as rows in the matricies incodesI and incodesQ. The number of rows shall equal the number of multiple spreading codes

Definition at line 176 of file spread.cpp.

References it_assert, mcspreadI, mcspreadQ, and itpp::Multicode_Spread_1d::set_codes().

Referenced by Multicode_Spread_2d().

Member Data Documentation

Multicode_Spread_1d itpp::Multicode_Spread_2d::mcspreadI

protected

The multicode spreaders for the I and Q channels respectively

Definition at line 274 of file spread.h.

Referenced by despread(), get_codesI(), set_codes(), and spread().

Multicode_Spread_1d itpp::Multicode_Spread_2d::mcspreadQ

protected

The multicode spreaders for the I and Q channels respectively

Definition at line 274 of file spread.h.

Referenced by despread(), get_codesQ(), set_codes(), 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