Algebraic space-time codes with full diversity and low peak-to-mean power ratio

P. Dayal, M.K. Varanasi
GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489)  
A new class of full diversity space-time codes is proposed that leads to a significantly smaller Peak-to-Mean Envelope Power Ratio (PMEPR) compared to the recently invented Diagonal Algebraic Space-Time (DAST) and Threaded Algebraic Space-Time (TAST) codes. Moreover, the proposed "Low PMEPR Space-Time" (LPST) codes exhibit identical performance and decoding complexity compared to the TAST codes. Additionally, unlike the TAST codes, the LPST codes meet an upper bound known as the Singleton bound
more » ... the Singleton bound on the maximum achievable rate by a spacetime code. The key to the construction of the LPST codes is an improved spreading scheme that outperforms the originally suggested Hadamard spreading scheme for the PMEPR reduction of DAST codes. Several properties of the LPST codes in relation to PMEPR are studied. Numerical results are presented to support the significant advantage of the proposed codes in terms of reduced PMEPR for high rate wireless communications. © layers of rotated and scaled information symbols are threaded in a matrix in a non-overlapping fashion and the scaling constants are chosen to ensure full transmit diversity. The TAST codes result in a considerable performance improvement over the DAST codes although at a significant increase in decoding complexity. Moreover, for © ¢ , the PMEPR of the TAST codes is large due to the same reasons as for the DAST code. For © ¢ , the TAST codes do not meet the Singleton bound either even though they have a higher rate of © symbols per channel use compared to the DAST codes. The condition
doi:10.1109/glocom.2003.1258577 dblp:conf/globecom/DayalV03 fatcat:hbqvntkimrhf3oxukjntvc4ed4