A low-complexity 2D signal space diversity solution for future broadcasting systems

TL;DR

This paper introduces a low-complexity 2D signal space diversity method for future broadcasting systems, improving performance over fading channels while significantly reducing demodulation complexity compared to existing DVB-T2 solutions.

Contribution

It proposes new rotation angles and detection techniques for QAM constellations that simplify transmitter and receiver design with enhanced performance.

Findings

Achieves over 60% complexity reduction in demappers.

Provides better performance than DVB-T2 angles.

Simplifies both transmitter and receiver architecture.

Abstract

-DVB-T2 was the first industrial standard deploying rotated and cyclic Q delayed (RCQD)modulation to improve performance over fading channels. This enablesimportantgains compared toconventional quadrature amplitude modulations(QAM) under severe channel conditions.However, the corresponding demodulation complexitystill prevents its use forwider applications. This paper proposes several rotation angles for different QAM constellations anda corresponding low-complexity detection method. Results show that the proposed solution simplifies both the transmitter and the receiver with often betterperformancethan the proposed angles in DVB-T2. Compared with the lowest complexity demappers currently used in DVB-T2, the proposed solution achieves an additional reduction bymore than 60%. Index Terms- DVB-T2, Rotated and Cyclic Q Delayed (RCQD) Modulations, Signal Space Diversity (SSD), Fading Channel, Quadrature Amplitude Modulations (QAM), Max-Log, ComputationalComplexity.