Patent ID: 8040963
Filing Date: 2011-10-18
Classification: H04L

Abstract:
1. A method for reducing Peak-to-Average Power Ratio in an orthogonal frequency division multiplex transmission system, comprising: complementary parity coding in the orthogonal frequency division multiplex transmission system by coding rules derived from an appropriate auto-correlation property of transmitted symbol sequences, the auto-correlation property taking on at least one minimal but non-zero value for +N/2 and −N/2 shifts, where N stands for a length of the transmitted symbol sequences; inserting redundant symbols, defined by said complementary parity coding, into a symbol sequence after said complementary parity coding; transmitting further bits in the symbol sequences by a Sign Position Modulation; and determining prototypes, by a position of a sign, which are mutually exclusive, providing that exactly one prototype takes on an opposite value compared to other prototypes in a set.