August  2010, 4(3): 345-361. doi: 10.3934/amc.2010.4.345

On linear balancing sets

1. 

Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742

2. 

Computer Science Department, Technion, Haifa 32000, Israel

3. 

Hewlett–Packard Laboratories, Palo Alto, CA 94304, United States

Received  November 2009 Revised  March 2010 Published  August 2010

Let $n$ be an even positive integer and $\mathbb F$ be the field GF$(2)$. A word in $\mathbb F$n is called balanced if its Hamming weight is $n$/$2$. A subset $\mathcal C\subseteq\mathbb F$n is called a balancing set if for every word $\mathbf y\in\mathbb F$n there is a word $\mathbf x\in \mathcal C$ such that $\mathbf y + \mathbf x$ is balanced. It is shown that most linear subspaces of $\mathbb F$n of dimension slightly larger than $\frac{3}{2} \log$2$n$ are balancing sets. A generalization of this result to linear subspaces that are "almost balancing" is also presented. On the other hand, it is shown that the problem of deciding whether a given set of vectors in $\mathbb F$n spans a balancing set, is NP-hard. An application of linear balancing sets is presented for designing efficient error-correcting coding schemes in which the codewords are balanced.
Citation: Arya Mazumdar, Ron M. Roth, Pascal O. Vontobel. On linear balancing sets. Advances in Mathematics of Communications, 2010, 4 (3) : 345-361. doi: 10.3934/amc.2010.4.345
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