# Space-time spatial channel modulation with multiple constellations

## TL;DR

This paper introduces a new communication technique that combines spatial and channel modulation to improve data transmission efficiency and reduce errors.

## Contribution

A novel STBC-SCM scheme is proposed using hybrid constellations and channel state indexes to enhance spectral efficiency and BER performance.

## Key findings

- The STBC-SCM outperforms traditional schemes like STCM and QSM-MBM in terms of bit error rate.
- Hybrid constellations and channel state indexes significantly improve spectral efficiency.
- Minimum Euclidean distances and detection complexity are analyzed for performance evaluation.

## Abstract

In this paper, a new schematic of spatial channel modulation aided space-time block code (STBC-SCM), which is to exploit more additional information with both the hybrid constellations group indexes (CGI) and the channel state indexes, is proposed to achieve the higher spectral efficiency and the improvement of the bit error rate (BER) performance. Specifically, four groups of mixing two signal constellations are designed for the selection of two CGI bits and encoded into one STBC codeword. Then, it is modulated on two active transmit antennas (TAs) using the antenna index (AI) bits. Furthermore, its two symbols on each active TAs are transmitted over the specified channel states with two independent parts of channel index (CI) bits, respectively. Finally, the minimum Euclidean distances with each time-slot, the detection complexity and the bit error probability are analyzed. Simulation results are shown that the performance improvement for the STBC-SCM is obviously achieved over other traditional schemes such as space-time channel modulation (STCM) and quadrature spatial modulation aided media based modulation (QSM-MBM).