Programmable multiuser synchronization for OFDM-CDMA
Shan-Tsung Wu, Kwang‐Cheng Chen · 2002
A more effective synchronization is required for multiuser detection because of its high sensitivity to estimation errors of timings, carrier phases, and amplitudes. From the multiuser synchronization approach proposed in Chang et al., (2000), we develop a linear-complexity programmable multiuser synchronization structure for OFDM-CDMA in a multiray fading channel. Based on LMMSE and BLUE, we develop joint estimation of timings, carrier phases, and amplitudes. The structure can be programmed to various OFDM-CDMA by adjusting system parameters and its performance is also verified by simulations. An algorithm is further proposed to avoid irrelevant calculations of FFT. The proposed structure is valuable and desirable for its programmability and near-far resistance.