Wireless LAN White Papers
Using Constellation Shaping to Reduce the Peak and Average Power of OFDM Signals
Overview This paper suggests applying constellation shaping to reduce the peak and average power of Orthogonal Frequency Division Multiplexing (OFDM) signals using Quadrature Amplitude Modulation (QAM) in all subcarriers without clipping or reducing the data rate. Adopting the successful shell mapping algorithm for high data rate transmission over telephone channels, as described in the V.34 Recommendation of ITU-T, the authors build a shell mapping algorithm for multidimensional constellation in the frequency domain for OFDM communication systems with N subcarriers. The authors give closed-form expressions of the functions needed to apply the constellation shaping algorithm for any N being a power of two. No side information needs to be transmitted and the data rate remains the same as for the basic OFDM system.
| Publisher | Institute of Electrical and Electronics Engineers | File Format | |
|---|---|---|---|
| Date Published | May 2006 | ||
| Format | White Papers | ||
| Topics | |||
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