naa a22 4500 510793401 CHVBK 20180411083327.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11277-012-0691-6 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0691-6 Cooperative Relaying Scheme for Orthogonal Frequency and Code Division Multiple Access Uplink System [Elektronische Daten] [Jung-In Baik, Hyoung-Kyu Song] Orthogonal frequency and code division multiplexing (OFCDM) which can be extended orthogonal frequency and code division multiple access (OFCDMA) has a good performance, because it can mitigate multi path interference while maintaining high data rate. Furthermore, cooperative OFCDM relaying system provides these advantages, and this system can effectively use the limited resource with respect to data rate and each terminal's energy efficiency. Therefore we proposed cooperative OFCDMA relaying uplink system because of the user's requirement of the high data rate at uplink. However, a throughput performance decreases when this system employs many relays in case of each relay allocated code channel to separate each relay's signal. Therefore, in this paper, we present that the proposed system combines cyclic delay diversity due to complement throughput performance problem. DF (Decode-and-Forward) is assumed in this paper. It is considered that the users which want to send data to BS only decode the data from other users. In addition to that, we propose the adaptive cooperative communication for the OFCDMA uplink system. The proposed adaptive system can easily select the cooperative relay. The Author(s), 2012 OFCDMA nationallicence CDD nationallicence Cooperative relaying nationallicence Relaying selection nationallicence Baik Jung-In 412, uT communication institute, Choongmu-gwan, Sejong university, 98 Gunja-dong, Gwangjin-gu, 143-747, Seoul, Korea aut Song Hyoung-Kyu 412, uT communication institute, Choongmu-gwan, Sejong university, 98 Gunja-dong, Gwangjin-gu, 143-747, Seoul, Korea aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/1(2013-05-01), 239-251 0929-6212 70:1<239 2013 70 11277 https://doi.org/10.1007/s11277-012-0691-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0691-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Baik Jung-In 412, uT communication institute, Choongmu-gwan, Sejong university, 98 Gunja-dong, Gwangjin-gu, 143-747, Seoul, Korea aut NATIONALLICENCE 700 1- Song Hyoung-Kyu 412, uT communication institute, Choongmu-gwan, Sejong university, 98 Gunja-dong, Gwangjin-gu, 143-747, Seoul, Korea aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/1(2013-05-01), 239-251 0929-6212 70:1<239 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer