TY - JOUR
T1 - Complementary Coded CDMA Systems with CP-Free OFDM
AU - Wang, Xiang
AU - Liu, Xiqing
AU - Chen, Hsiao Hwa
AU - Meng, Weixiao
N1 - Funding Information:
Manuscript received January 19, 2020; revised June 10, 2020; accepted July 19, 2020. Date of publication July 30, 2020; date of current version October 22, 2020. This work was supported in part by the Natural Science Foundation of China under Grants U1764263, 61671186, and 61901315, and in part by the Taiwan Ministry of Science and Technology under Grants 106-2221-E-006-028-MY3, 106-2221-E-006-021-MY3, 109-2221-E-006-175-MY3, and 109-2221-E-006-182-MY3. (Corresponding author: Hsiao-Hwa Chen.) Xiang Wang and Weixiao Meng are with the School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China (e-mail: wangxiang@hit.edu.cn; wxmeng@hit.edu.cn).
PY - 2020/10
Y1 - 2020/10
N2 - In a frequency division complementary coded CDMA (FD-CC-CDMA) system, multiple tuners have to be used for multi-carrier modulation, which has a very high complexity and power consumption. In this paper, we propose a CP-free OFDM scheme to implement multi-carrier modulation in an FD-CC-CDMA system, which is named as CP-free OFDM-CC-CDMA system. The transmitter in the CP-free OFDM-CC-CDMA system offers a unique flexibility to adjust the amount of data processed at the same time to ensure that the OFDM block size exceeds the delay spread of a multipath channel, which attributes to effective mitigation of multipath induced inter-symbol interference (ISI). At the receiver of a CP-free OFDM-CC-CDMA system, minimum mean square error (MMSE) equalization and MMSE combining are used to mitigate multi-user interference (MUI) and inter-carrier interference (ICI). The obtained results show that a CP-free OFDM-CC-CDMA system offers a much higher transmission efficiency than FD-CC-CDMA and OFDM-DS-CDMA systems. In addition, the proposed CP-free OFDM-CC-CDMA system outperforms OFDM-DS-CDMA system in terms of bit error rate due to its inherent powerful diversity gain.
AB - In a frequency division complementary coded CDMA (FD-CC-CDMA) system, multiple tuners have to be used for multi-carrier modulation, which has a very high complexity and power consumption. In this paper, we propose a CP-free OFDM scheme to implement multi-carrier modulation in an FD-CC-CDMA system, which is named as CP-free OFDM-CC-CDMA system. The transmitter in the CP-free OFDM-CC-CDMA system offers a unique flexibility to adjust the amount of data processed at the same time to ensure that the OFDM block size exceeds the delay spread of a multipath channel, which attributes to effective mitigation of multipath induced inter-symbol interference (ISI). At the receiver of a CP-free OFDM-CC-CDMA system, minimum mean square error (MMSE) equalization and MMSE combining are used to mitigate multi-user interference (MUI) and inter-carrier interference (ICI). The obtained results show that a CP-free OFDM-CC-CDMA system offers a much higher transmission efficiency than FD-CC-CDMA and OFDM-DS-CDMA systems. In addition, the proposed CP-free OFDM-CC-CDMA system outperforms OFDM-DS-CDMA system in terms of bit error rate due to its inherent powerful diversity gain.
UR - http://www.scopus.com/inward/record.url?scp=85095693000&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85095693000&partnerID=8YFLogxK
U2 - 10.1109/TVT.2020.3013155
DO - 10.1109/TVT.2020.3013155
M3 - Article
AN - SCOPUS:85095693000
VL - 69
SP - 11515
EP - 11528
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
SN - 0018-9545
IS - 10
M1 - 9153175
ER -