{"title":"A low complexity selective mapping to reduce intercarrier interference in OFDM systems","authors":"A. Ghassemi, T. Gulliver","doi":"10.1109/ICASSP.2008.4518298","DOIUrl":null,"url":null,"abstract":"One of major drawbacks of orthogonal frequency division multiplexing is sensitivity to frequency offsets caused by a mismatch between the transmitter and receiver oscillators. This offset destroys the orthogonality of the sub-carriers and introduces intercarrier interference (ICI), reducing the system performance. Previously, selective mapping was considered for reducing the peak interference-to-carrier ratio (PICR). However, this technique has a high computational complexity due to multiple inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) operations. In this paper, we exploit the IFFT/FFT structure to generate phase rotated SLM sequences and obtain a low PICR. This technique significantly reduces the computational complexity while providing a PICR performance close to that of the previous SLM technique.","PeriodicalId":333742,"journal":{"name":"2008 IEEE International Conference on Acoustics, Speech and Signal Processing","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2008-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2008 IEEE International Conference on Acoustics, Speech and Signal Processing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICASSP.2008.4518298","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
One of major drawbacks of orthogonal frequency division multiplexing is sensitivity to frequency offsets caused by a mismatch between the transmitter and receiver oscillators. This offset destroys the orthogonality of the sub-carriers and introduces intercarrier interference (ICI), reducing the system performance. Previously, selective mapping was considered for reducing the peak interference-to-carrier ratio (PICR). However, this technique has a high computational complexity due to multiple inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) operations. In this paper, we exploit the IFFT/FFT structure to generate phase rotated SLM sequences and obtain a low PICR. This technique significantly reduces the computational complexity while providing a PICR performance close to that of the previous SLM technique.