Phase factor preferred pair method for reducing PAPR of OFDM signal

Abstract

The invention discloses a phase factor preferred pair method for reducing PAPR (Peak To Average Power Ratio) of an OFDM (Orthogonal Frequency Division Multiplexing) signal. The method comprises the steps as follows: obtaining an optimal phase factor sequence in a way of iteratively optimizing a phase factor matrix, namely randomly generating the Q*V phase factor matrix in which Q is P2, P is the number of user settings and V is the number of phase factors, dividing the phase factor matrix into two sub-matrixes, carrying out dot product on phase factor sub-vectors in the sub-matrixes and a data frequency domain signal matrix respectively to obtain phase rotation results, sorting the PAPRs of the phase rotation results from small to big, selecting sub-vectors corresponding to the front P PAPRs, obtaining two groups of the sub-vectors from the two sub-matrixes, and carrying out addition operation on the sub-vectors in the first group and the second group to reconstruct the Q*V phase factor matrix. The phase factor matrix can be optimized by multi-time iteration, and the phase factor vector used for enabling the PAPR of the transmission signal to be minimal is selected as the optimal phase factor sequence from the optimized phase factor matrix. By adopting the method, a better phase factor can be more quickly and effectively obtained to reduce the PAPR of an OFDM system.

Description

technical field [0001] The present invention belongs to the technical field of wireless communication, and more particularly, relates to a method for reducing the phase factor optimal pair of OFDM signal PAPR. Background technique [0002] With the development of communication technology, people's demands for broadband, personalization and mobility of communication are getting higher and higher. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology, as a multi-carrier transmission system, has been widely used in the field of wireless communication due to its high spectrum utilization, good anti-multipath fading and anti-interference performance. It has become one of the main candidate technologies for future mobile multimedia communication. [0003] Although the OFDM technology has many advantages, the OFDM system has the disadvantage of high PAPR (Peak to Average Power Ratio, peak-to-average power ratio, peak-to-average ra...

AI Technical Summary

Problems solved by technology

If the traditional full search is used to select the phase factor, although the effect is good, the computational complexity is very high

At present, there are many algorithms for searching phase factor combinations in PTS. Intelligent algorithms have been widely used to search for optimal phase factor combinations. Among intelligent algorithms, GA-PTS algorithm (Genetic Algorithm, genetic algorithm) and particle swarm algorithm are all effective. Searching for the optimal phase factor method, but still has the disadvantage of being easily trapped in local optimization, and requires a high number of iterations to achieve a good optimization effect, which cannot fully meet the requirements of suppressing PAPR in OFDM systems

Images