Codeword Position Index based Sparse Code Multiple Access System

TL;DR

This paper introduces CPI-SCMA, a new SCMA variation that encodes information through codeword positions, enhancing power, transmission efficiency, and error rate performance over traditional SCMA.

Contribution

The paper proposes CPI-SCMA, a novel scheme that leverages codeword position indices for improved data transmission in SCMA systems.

Findings

CPI-SCMA outperforms conventional SCMA in error rate.

CPI-SCMA improves power and transmission efficiency.

The scheme demonstrates better performance in simulations.

Abstract

In this letter, a novel variation of sparse code multiple access (SCMA), called codeword position index based SCMA (CPI-SCMA), is proposed. In this scheme, the information is transmitted not only by the codewords in M point SCMA codebook, but also by the indices of the codeword positions in a data block. As such, both the power and transmission efficiency (TE) can be improved, moreover, CPI-SCMA can achieve a better error rate performance compare to conventional SCMA (C-SCMA).