Optimized rotations for LDPC-coded Gray-mapped MPSK constellations with signal space diversity

Conference paper (2006)

Authors

NF Kiyani Wireless and Mobile Communications
SUH Rizvi Wireless and Mobile Communications
J.H. Weber Wireless and Mobile Communications
G.J.M. Janssen Wireless and Mobile Communications
Research Group
Wireless and Mobile Communications
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Published Date

2006

Language

Undefined/Unknown

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Research Group

Wireless and Mobile Communications

Abstract

Rotation of the signal constellation together with in-phase and quadrature channel interleaving (signal space diversity) is known to provide good performance gains over fading channels for multi level modulation methods. This paper studies the extension of such schemes with a low density parity check (LDPC) code. It is shown that for both coded and un-coded Gray-mapped MPSK modulation formats with singal space diversity on a Raleigh fading channel, a well-considered choice of the rotation angle may lead to a significant gain over the conventional un-rotated constellation. However, the optimum rotation angel for the coded scheme may be different from the corresponding optimization of the un-coded scheme.