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commfunc.h File Reference


Detailed Description

Definitions of some specific functions useful in communications.

Author:
Tony Ottosson and Erik G. Larsson
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IT++ - C++ library of mathematical, signal processing, speech processing, and communications classes and functions

Copyright (C) 1995-2007 (see AUTHORS file for a list of contributors)

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

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Definition in file commfunc.h.

#include <itpp/base/mat.h>
#include <itpp/base/vec.h>

Go to the source code of this file.

Namespaces

namespace  itpp

Functions

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.

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

This function computes the solution of the water-filling problem

\[ \max_{p_0,...,p_{n-1}} \sum_{i=0}^{n-1} \log\left(1+p_i\alpha_i\right) \]

subject to

\[ \sum_{i=0}^{n-1} p_i \le P \]

.

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