TY - JOUR
T1 - High performance phase rotated spreading codes for MC-CDMA
AU - Zhang, Zhiping
AU - Qu, Yang
AU - Zhang, Lin
AU - Ellinger, John
AU - Wu, Zhiqiang
PY - 2016/3/23
Y1 - 2016/3/23
N2 - In conventional multi-carrier CDMA (MC-CDMA) systems, binary spreading codes such as Hadamard-Walsh codes are employed to spread user information across all subcarriers to exploit frequency diversity in frequency selective fading channels. We first recap that because of the binary nature of the spreading codes, transmission power is not distributed evenly across all subcarriers. Oftentimes, certain subcarriers have zero transmission power, leading to less diversity to be exploited at receiver. We employ a phase rotated spreading code design and derive the corresponding combining scheme for the phase rotated codes. As a direct result, MC-CDMA system now exploits full diversity available in the channel at all times, leading to significant performance gain. Simulation results over various multi-path fading channels confirm the performance gain of the scheme.
AB - In conventional multi-carrier CDMA (MC-CDMA) systems, binary spreading codes such as Hadamard-Walsh codes are employed to spread user information across all subcarriers to exploit frequency diversity in frequency selective fading channels. We first recap that because of the binary nature of the spreading codes, transmission power is not distributed evenly across all subcarriers. Oftentimes, certain subcarriers have zero transmission power, leading to less diversity to be exploited at receiver. We employ a phase rotated spreading code design and derive the corresponding combining scheme for the phase rotated codes. As a direct result, MC-CDMA system now exploits full diversity available in the channel at all times, leading to significant performance gain. Simulation results over various multi-path fading channels confirm the performance gain of the scheme.
UR - https://corescholar.libraries.wright.edu/ee/90
U2 - 10.1109/ICCNC.2016.7440602
DO - 10.1109/ICCNC.2016.7440602
M3 - Article
JO - 2016 International Conference on Computing, Networking and Communications, ICNC 2016
JF - 2016 International Conference on Computing, Networking and Communications, ICNC 2016
ER -