TY - GEN
T1 - Influence of code orthogonality on downlink throughput comparison between MC-CDMA and OFDMA in multi-cellular environments
AU - Alrawi, Anas F.
AU - Sharif, Bayan S.
AU - Tsimenidis, Charalampos C.
AU - Ntagkounakis, Konstantinos
PY - 2009
Y1 - 2009
N2 - Fourth generation (4G) mobile access is drawing particular attention as it promises to deliver high data rates and reliable coverage for broadband wireless access. In this paper, Orthogonal Frequency Division Multiplexing Access (OFDMA) and Multi-Carrier Code Division Multiplexing Access (MC-CDMA) are investigated to highlight their strengths and weaknesses as candidates for 4G wireless access. Using a multi-cell environment, MC-CDMA and OFDMA coverage is dimensioned based on the value of the Signal to Interference plus Noise Ratio (SINR). The results show that OFDMA system offers cell coverage of 92.5 %and a maximum actual throughput of 24.2 Mbps/cell (fade margin 10 dB). Using the same assumptions for MC-CDMA, the results show better coverage only with complete orthogonal spreading codes which can guarantee 97 % of user coverage and actual throughput of 28.8 Mbps. These measurements decrease as the orthogonality between the spreading codes is reduced. In the case of 94 % orthogonality the MC-CDMA system achieved 89.3 % coverage and 21.9 Mbps throughput while with a 60 % orthogonality 47 % coverage and 5.8 Mbps throughput was achieved.
AB - Fourth generation (4G) mobile access is drawing particular attention as it promises to deliver high data rates and reliable coverage for broadband wireless access. In this paper, Orthogonal Frequency Division Multiplexing Access (OFDMA) and Multi-Carrier Code Division Multiplexing Access (MC-CDMA) are investigated to highlight their strengths and weaknesses as candidates for 4G wireless access. Using a multi-cell environment, MC-CDMA and OFDMA coverage is dimensioned based on the value of the Signal to Interference plus Noise Ratio (SINR). The results show that OFDMA system offers cell coverage of 92.5 %and a maximum actual throughput of 24.2 Mbps/cell (fade margin 10 dB). Using the same assumptions for MC-CDMA, the results show better coverage only with complete orthogonal spreading codes which can guarantee 97 % of user coverage and actual throughput of 28.8 Mbps. These measurements decrease as the orthogonality between the spreading codes is reduced. In the case of 94 % orthogonality the MC-CDMA system achieved 89.3 % coverage and 21.9 Mbps throughput while with a 60 % orthogonality 47 % coverage and 5.8 Mbps throughput was achieved.
UR - http://www.scopus.com/inward/record.url?scp=70449515902&partnerID=8YFLogxK
U2 - 10.1109/ISCC.2009.5202290
DO - 10.1109/ISCC.2009.5202290
M3 - Conference contribution
AN - SCOPUS:70449515902
SN - 9781424446711
T3 - Proceedings - IEEE Symposium on Computers and Communications
SP - 249
EP - 254
BT - IEEE Symposium on Computers and Communications 2009, ISCC 2009
T2 - IEEE Symposium on Computers and Communications 2009, ISCC 2009
Y2 - 5 July 2009 through 8 July 2009
ER -