TY  - JOUR
T1  - Differential Space-Time Line Codes and Its Performance Comparison According to Constellations
AU  - Joung, Jingon 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2024
DA  - 2024/1/1
DO  - 10.7840/kics.2024.49.5.702
KW  - Differential space-time line code
KW  - time-varying channels
KW  - non-constant modulus constellation
AB  - This study proposes a differential space-time line code (DSTLC) for wireless communications in a time-varying channel environment. The existing space-time line code (STLC) technique proposed in a time-invariant channel environment requires full channel state information (CSI) at the transmitter, which is unsuitable for mobile communications operating in a time-varying channel environment. On the other hand, the proposed DSTLC system does not require CSI for the encoding and decoding. However, since the DSTLC techniques suffer ambiguity on the amplitude of the modulated signals, a non-constant modulus constellation (NCMC) like a quadrature amplitude modulation (QAM) probably having symbols with the identical phases cannot be used, and thus, a constant modulus constellation (CMC), such as phase-shift keying, must be used for the designed DSTLC systems. To resolve this issue, various amplitude and phase-shift keying methods with NCMC are designed, and using them, the feasibility of DSTLC is verified for mobile communications.