Miscellaneous Communications Functions

Classes
class	itpp::EXIT
	EXtrinsic Information Transfer (EXIT) chart. More...
class	itpp::Multilateration
	Multilateration class for 3D indoor localization More...
class	itpp::STC
	Space Time block Codes (STC) class. More...

Functions
bmat	itpp::graycode (int m)
	Generate Gray code of blocklength m. More...
int	itpp::hamming_distance (const bvec &a, const bvec &b)
	Calculate the Hamming distance between a and b.
int	itpp::weight (const bvec &a)
	Calculate the Hamming weight of a.
vec	itpp::waterfilling (const vec &alpha, double P)
	Compute the water-filling solution. More...

Detailed Description

Function Documentation

graycode()

ITPP_EXPORT bmat itpp::graycode

(

int

m

)

Generate Gray code of blocklength m.

The codes are contained as binary codewords {0,1} in the rows of the returned matrix. See also the gray() function in math/scalfunc.h.

Definition at line 39 of file commfunc.cpp.

References itpp::concat(), itpp::ones_b(), itpp::reverse(), itpp::to_bmat(), and itpp::zeros_b().

Referenced by itpp::QAM::set_M(), itpp::PSK::set_M(), itpp::PAM_c::set_M(), itpp::PAM::set_M(), itpp::ND_UPAM::set_M(), itpp::ND_UQAM::set_M(), and itpp::ND_UPSK::set_M().

waterfilling()

ITPP_EXPORT vec itpp::waterfilling	(	const vec &	alpha,
		double	P
	)

Compute the water-filling solution.

This function computes the solution of the water-filling problem

subject to

Parameters

alpha	vector of gains (must have strictly positive elements)
P	power constraint

Returns

vector of power allocations

The computational complexity of the method is at most

Definition at line 82 of file commfunc.cpp.

References it_assert, and itpp::length().