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• W3142017777 abstract "In this papor, we present a new method far widehand direction-al-anivsl (OOA) estimation, based on sptialiy interpolated xideband beamformer (SIWB). The SlWB is derlgned to have frequency-invariant beam-response, prescribed main beamwidth and prescribed sidelobe level within P wide signal bandwidth. For wideband DOA estimation, the SIWB's an he wed as spatial pre-pmeessors transforming the widehand signals at the outputs of antenna array (Plement-SQace) into the beam-spee signals prior to applying narrowband DOA estimation. The new SWB-based method enhancer the resoiution of ~pectral estimation and reducing root-mean-square ermrafDOA slimation without increasingnumber ofarraydomonls. Furthemore. the propwed method is appilcahle for DOA estimation of coherent sourCS without preliminary OOA ertimster. The perfoormnnm of the pmpaaed method in comparison with the conventional methods is Illu~atd in simulation results. 1. lntmdvction Recently, smut antennas have been proposed 10 increase (he data me and to improve the quality of wiiele~s transmission [I]. 121. Funhermore. in future wireless ~ommuni~rtion systems. wideband signals will he used to fuifii the requirements of higher data race services [I]. Therefore. $mm antennas for widehand signals will be the kcy ~olution for reliable high-data-rate wireless channels. In this paper, we will facm on wideband beamforming and widehand DOA ercimation. which are two main functions in smm antenna based applications. l*tiai widehand DOA eSlimation method is introduced in I31 for incoherent signal sources. The Coherent Signal-Subspace (CSS) 141 and its funher developments in [5]-[71 are alcemative methods IO dcai wiih coherem SOUTCCI. Although these methods exhibit high resol~tion and small rem-meansqum emi (RMSE), there are conliderable difficulties in the implemcnrarion due 10 heavy campufational requirement. Moreover, for widehand DOA estimation, there methods require preliminary OOA cscimalcs in (he neighborhoods of the Vue directions of aniual. resulting in greater computational complexity. in order to reduce the complexir). of eSLimatc. other widehand DOA estimation methods hascd an the beam-space PmceSSing are propored in [81-[101. These methods are applicahie'foi DOA estimation of coherent sources without preliminary DOA estimates. Although the methods improve the resoIulion of estimate compmd with thc CSS-based methods. they exhibit higher RMSE due to bias eslimatc. In this paper. we propose a new widehand DOA eirimation method based on beam-space processing. The proposed method inherits the advantages of beam-space-based methods. Funhermore. it reduces the hiasesrimateandcnhancerUleresolutianofestimatewithou1 increasing numberofmy elements. We first extend the spatially interpolated heamformer (SIB) proposed in [I I] IO wideband beamformer and then developing a widehand EOA estimation mcthcd based on this wideband beamformer. In [l I], the SIB is ahic to prescribe a narrow main beamwidth and iow sidelobe level (SLL) by using a spatial interpolation proccss that Consists of two cwadcd spathi filters. For the proposed widcband beamformer. these spatial fiitcn will be *placed hy two frequency-dormin frequencymvariml &omformerr (FDFiB'sj 1101. Therefore, the resuiting widehand beamformcr. which is referred to as rpariolly interpalarod videbond buzm/ormr (SIWB), is able to pmducc frequencyinvaianf beam-pattem with prescribed main beamwidth and prescribed SLL. Far wideband DOA eslimalion. we will use a set of these SIWB's (beamforming network) as spatial pe-pmcssors transforming the signals at the outputs a1 antenna array (element-space) inrothebeam-space signals." @default.
• W3142017777 created "2021-04-13" @default.
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• W3142017777 date "2004-01-01" @default.
• W3142017777 modified "2023-09-27" @default.
• W3142017777 title "Wideband Direction-of-Arrival Estimation Using Spatially Interpolated Wideband Beamformers" @default.
• W3142017777 hasPublicationYear "2004" @default.
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