Dual-mode Blind Decision Feedback Equalizer for High-Order QAM Multi-domain Measurement
Based on real-time multi-domain signal analysis architecture for high-order Quadrature Amplitude Modulation (QAM) communication, a dual-mode blind adaptive decision feedback equalization (DFE) scheme for high-order QAM real-time multi-domain analysis and specifications measurement is presented. The proposed two-phase scheme consists of the generalized multi-modulus algorithm (GMMA) for initial convergence during blind startup, and the decision–directed least mean square algorithm (DDLMS) which is used to enhance the performance. The two operation modes are automatic switched according to the equalizer output error level. Combined with step-size parameter variation online in each mode, the blind equalization solution can converge rapidly with low residual tap fluctuation noise. The simulation results show that the proposed techniques converge quickly and reduce the residue mean squared error (MSE) caused by the propagation channel to -40dB. On the other hand, the proposed algorithm is practically implemented in the communication testing system. The measurement error of EVM is less than 2％ for 6.4MSps 256QAM in the 20MHz real-time analysis bandwidth. For these considerable merits, the scheme is quite suitable for high-resolution communication measurement instruments design.
Xiao Yan Qian Wang Kaiyu Qin
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, Institute of Astronautics & Aeronautics, University of Electronic Science and Technology of China, C
国际会议
2009国际通信电路与系统学术会议(ICCCAS 2009)(2009 International Conference on Communications，Circuits and Systems)
成都
英文
91-95
2009-07-23（万方平台首次上网日期，不代表论文的发表时间）