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itpp::Spread_2d Class Reference
[Digital Modulation]

#include <itpp/comm/spread.h>

List of all members.


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 151 of file 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.
short get_period ()
 Get the period of the code (length of code vector).

Protected Attributes

Spread_1d spreadI
Spread_1d spreadQ

Member Data Documentation

The spreaders for the I and Q channels respectively

Definition at line 181 of file spread.h.

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

The spreaders for the I and Q channels respectively

Definition at line 181 of file spread.h.

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


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