Multi transform OFDM systems and methods with low peak to average power ratio signals

摘要

Various embodiments of the invention are directed to methods and systems for multi transform OFDM transmitter and receivers with low peak to average power ratio (PAPR) signals, that have high bandwidth efficiency and are computational efficient. For example, various embodiments of the transmitter may utilize an architecture comprised of a baseband modulator, a serial to parallel converter, a bank of multiplicity NT orthonormal transforms unit, a bank of multiplicity NT inverse Fourier transforms unit, a dummy symbols generator, and a minimum PAPR evaluation unit for finding the optimum transform index n0. Various embodiments of the receiver may comprise of a transform index detection unit for the detection of the transform index imbedded in the OFDM signal.

主权项

1. An Orthogonal Frequency Division Multiple Accessing (OFDM) transmitter system comprised of:
a baseband modulator for receiving and modulating the user input data providing general complex valued, information baseband symbols; a serial to parallel converter for providing the modulation symbol vector of dimension N with NI≦N elements selected from the information baseband symbols; a bank of multiplicity NT distinct orthonormal transforms units operating on the modulation symbol vector providing the multiplicity NT transformed symbol vectors; a bank of multiplicity NT inverse Fourier transforms units for providing the multiplicity NT transformed OFDM signal vectors; a minimum PAPR (peak to average power ratio) evaluation unit for finding an optimum transform index n0 from the multiplicity NT transformed OFDM signal vectors; and a means of transmitting the optimum transform index.