{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,11,20]],"date-time":"2023-11-20T00:09:17Z","timestamp":1700438957765},"reference-count":29,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2008,9,12]],"date-time":"2008-09-12T00:00:00Z","timestamp":1221177600000},"content-version":"vor","delay-in-days":2568,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Trans Emerging Tel Tech"],"published-print":{"date-parts":[[2001,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Due to the increasing number of users in mobile communications and the demand for mobile multimedia services with high data rates, third generation mobile radio systems are currently one of the key communication technologies in research, development, and international standardization bodies. Smart antennas can be used to increase the capacity of wireless communication systems even further. TDD systems are particularly attractive for the employment of smart antennas, since the channel information (e. g., in terms of spatial covariance matrices) estimated on the uplink can be used directly for downlink beamforming. In this paper, we discuss efficient uplink and downlink processing techniques with smart antennas for UTRA TDD, the TDD mode of third generation mobile radio systems that is based on TD\u2014CDMA. On the uplink, joint space\u2014time processing is used to eliminate co\u2014channel interference created by other users that transmit on the same frequency and in the same time slot. These joint detection techniques are efficiently implemented in the frequency domain. On the downlink, the data is only transmitted in the direction of the desired mobile user while interference in the direction of co\u2014channel users is avoided. Moreover, <jats:italic>short\u2014term<\/jats:italic> spatial channel estimates can be improved by projecting them into the dominant subspace of the <jats:italic>long\u2014term<\/jats:italic> spatial covariance matrix. System level simulations have been performed to evaluate the gain in spectral efficiency (available bit rate per bandwidth per cell) if simple downlink beamforming techniques are used at the base stations. There is a two\u2014 to three\u2014fold spectral efficiency gain if antenna arrays of <jats:italic>M = 8<\/jats:italic> elements are deployed in a sectorized macro\u2014cellular environment.<\/jats:p>","DOI":"10.1002\/ett.4460120505","type":"journal-article","created":{"date-parts":[[2008,9,12]],"date-time":"2008-09-12T15:06:36Z","timestamp":1221231996000},"page":"393-406","source":"Crossref","is-referenced-by-count":5,"title":["Smart antennas for UTRA TDD"],"prefix":"10.1002","volume":"12","author":[{"given":"Martin","family":"Haardt","sequence":"first","affiliation":[]},{"given":"Christoph F.","family":"Mecklenbr\u00e4uker","sequence":"additional","affiliation":[]},{"given":"Marius","family":"Vollmer","sequence":"additional","affiliation":[]},{"given":"Peter","family":"Slanina","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2008,9,12]]},"reference":[{"key":"e_1_2_1_2_2","unstructured":"ETSI TR 101 112. 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