Peak average ratio restraint method for expandable OFDM system

Abstract

This invention provides one PAPR repress method in extensive OFDM system, which comprises the following steps: a, processing the input data front end; b, seizing and converting the processed data; c, processing repress on the sub load wave before extending OFDM system; d, converting the sub load wave through repress process; e, processing repress on sub load wave on extended OFDM system.

Description

technical field [0001] The present invention relates to scalable Orthogonal Frequency Division Multiplexing (OFDM) technology. Background technique [0002] In a scalable OFDM system, a widely recognized frequency band extension mode is as figure 1 The mode shown is to increase the number of sub-carriers under the condition that the width of the sub-carriers remains unchanged, so as to achieve the purpose of expanding the bandwidth. However, as the number of sub-carriers increases, the peak-to-average ratio (PAPR) performance of the system will quickly deteriorate. as simulation results figure 2 As shown, with the continuous increase of the number of subcarriers, the cumulative distribution function (CDF) of PAPR will increase sharply. [0003] Generally speaking, before the system is expanded, under a certain number of subcarriers, the PAPR of the system can be obtained to a satisfactory level through specific processing. Unfortunately, after the extension of OFDM, its...

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Problems solved by technology

[0004] However, this design will have at least two drawbacks

First of all, it is not conducive to easy expansion of the system, because the change of parameters will lead to reconsideration and redesign of many processes

On the other hand, it is difficult to guarantee that a PAPR process can continuously improve its performance, even if it can, it will sacrifice other benefits as a price

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