- TITLE:
**Amplitude and Sign Adjustment for Peak to Average Power
Reduction**
- AUTHORS: M. Sharif, C. Florens, M. Fazel, B. Hassibi
- ABSTACT:
In this paper, we propose a method to reduce the peak to mean
envelope power ratio (PMEPR) of multicarrier signals by modifying the
constellation. For MPSK constellations, we minimize the maximum of the
multicarrier signal over the sign and amplitude of each subcarrier. In
order to find an efficient solution to the aforementioned non-convex
optimization problem, we present a suboptimal solution by first optimizing
over the signs using the result of \cite{masconstant}, and then optimizing
over the amplitudes given the signs. We prove that the minimization
of the maximum of a continuous multicarrier signal over the amplitude of
each subcarrier
can be written as a convex optimization problem with linear matrix
inequality constraints.
We also generalize the idea to other constellations such as 16QAM.
Simulation results show that by an average power increase of 0.21 db
and not sending information over the sign of each subcarrier, PMEPR can
be decreased by 5.1 db for a system with 128 subcarriers.
- STATUS: Appeared in
* IEEE trans. on Communications*, August 2005.
- TCOM paper: pdf file.
- ICC'04 paper: