naa a22 4500 510797199 CHVBK 20180411083341.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11277-013-1203-z doi (NATIONALLICENCE)springer-10.1007/s11277-013-1203-z Uplink Channel Sounding in TDD-OFDM Cellular Systems [Elektronische Daten] [Hyung-Sin Kim, Seung-Hwan Lee, Yong-Hwan Lee] In this paper, we consider uplink channel sounding in time division duplex (TDD) orthogonal frequency division multiplexing (OFDM)-based cellular systems. The channel information provided by uplink sounding may be necessary to exploit closed loop transmission techniques in TDD-OFDM systems. However, conventional sounding schemes may suffer from large sounding overhead, significantly restricting the number of sounding users due to the resource shortage. To reduce the sounding overhead, the proposed scheme transmits sounding signal only through subchannels which are not highly correlated to each other. The whole channel information can be estimated from the partial one by exploiting the channel correlation in the frequency domain. Thus, the proposed scheme allows a larger number of users to transmit the sounding signal, while making the base station employ closed loop transmission techniques with the use of whole channel information. Finally, simulation results show that the proposed scheme noticeably improves the performance over conventional schemes in the presence of channel correlation. Springer Science+Business Media New York, 2013 Uplink sounding nationallicence Sounding overhead nationallicence Channel correlation nationallicence Closed loop transmission nationallicence Kim Hyung-Sin School of Electrical Engineering, INMC, Seoul National University, Kwanak, P.O. Box 34, 151-600, Seoul, Korea aut Lee Seung-Hwan School of Electrical Engineering, INMC, Seoul National University, Kwanak, P.O. Box 34, 151-600, Seoul, Korea aut Lee Yong-Hwan School of Electrical Engineering, INMC, Seoul National University, Kwanak, P.O. Box 34, 151-600, Seoul, Korea aut Wireless Personal Communications Springer US; http://www.springer-ny.com 73/3(2013-12-01), 563-585 0929-6212 73:3<563 2013 73 11277 https://doi.org/10.1007/s11277-013-1203-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1203-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Hyung-Sin School of Electrical Engineering, INMC, Seoul National University, Kwanak, P.O. Box 34, 151-600, Seoul, Korea aut NATIONALLICENCE 700 1- Lee Seung-Hwan School of Electrical Engineering, INMC, Seoul National University, Kwanak, P.O. Box 34, 151-600, Seoul, Korea aut NATIONALLICENCE 700 1- Lee Yong-Hwan School of Electrical Engineering, INMC, Seoul National University, Kwanak, P.O. Box 34, 151-600, Seoul, Korea aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 73/3(2013-12-01), 563-585 0929-6212 73:3<563 2013 73 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer