A discrete time domain window design method for inhibiting OFDMA system frequency spectrum sidelobes

Abstract

The invention discloses a discrete time domain window design method for inhibiting OFDMA system frequency spectrum sidelobes. The optimization problem based on the spectrum sidelobe minimization principle is established by vectorizing the discrete time domain window, and the approximate global optimal search algorithm is provided, so that the designed discrete time domain window can effectively inhibit the spectrum sidelobe of the OFDMA system, meanwhile, the calculation complexity of the optimization problem can be effectively reduced, and rapid convergence can be realized.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a discrete time-domain window design method capable of suppressing spectrum side lobes of an OFDMA system. Background technique [0002] OFDM is a multi-carrier modulation technology that can effectively combat frequency-selective fading, and each sub-carrier is orthogonal to each other, and the carriers overlap each other without interfering with each other, thereby saving spectrum bandwidth and maximizing the utilization of spectrum resources. OFDMA is a multiple access technology based on OFDM. OFDMA technology inherits the advantages of OFDM technology against complex time-varying channel fading, but also inherits two inherent shortcomings of OFDM technology: spectrum out-of-band (OOB, Out-of- Band) side lobe (out-of-band power radiation) is large and the peak-to-average power ratio (PAPR, Peak-to-Average-Power-Ratio) is high. In an OFDMA system, the out-of-band sidelob...

AI Technical Summary

Problems solved by technology

OFDMA is a multiple access technology based on OFDM. OFDMA technology inherits the advantages of OFDM technology against complex time-varying channel fading, but also inherits two inherent shortcomings of OFDM technology: spectrum out-of-band (OOB, Out-of- band) side lobe (out-of-band power radiation) large and peak-to-average power ratio (PAPR, Peak-to-Average-Power-Ratio) high

The IBOSB problem will affect the performance of the communication system and limit or even hinder the practical application of OFDMA technology

[0004] At present, researches on OOB suppression mainly focus on methods such as time-domain windowing, pulse shaping, correlation coding, subcarrier weighting, suppression queues, and precoding, but these methods may sacrifice the bit error rate (BER, Bit error rate) performance of the communication system. At the expense of increasing the complexity of the OFDM system, or at the expense of increasing the computational complexity of the OFDM system, or increasing the decoding complexity of the receiving end

The time-domain windowing method is the simplest and most effective method. At present, raised cosine windowing is mainly used, but the frequency spectrum of OFDMA system with raised cosine windowing is still relatively large. Therefore, it is necessary to further study a more optimized discrete time-domain window to suppress Spectrum Sidelobe of OFDMA System

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