A Low Complexity Architecture for OFCDM Downlink Transmitter Using Joint Time-Frequency Spreading and IFFT

作者：Dan, Lilin^*; Xiao, Yue; Ni, Wei; Li, Shaoqian

来源：IEICE - Transactions on Communications, 2009, E92B(10): 3071-3074.

DOI：10.1587/transcom.E92.B.3071

• OFCDM
• MC-CDMA
• two dimensional spreading
• IFFT

In this letter, a low complexity transmitter is proposed for the downlinks of orthogonal frequency code division multiplexing (OFCDM) systems. The principle is based on a joint time-frequency spreading and inverse fast Fourier transform (TFS-IFFT), which combines the frequency spreading with partial stages of IFFT, so as to simplify the real-time processing. Compared with the conventional one, the proposed OFCDM transmitter is of lower real-time computational complexity, especially for those with large spreading factor or low modulation level. Furthermore, the proposed TFS-IFFT can also be applied to other frequency spreading systems. such as MC-CDMA, for complexity reduction.

• 出版日期2009-10
• 单位电子科技大学