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Adaptive Frequency-Domain Channel Estimator in 4$ ,times ,$4 MIMO-OFDM Modems

机译:4 $,times,$ 4的自适应频域信道估计器MIMO-OFDM Modem

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摘要

This work presents an adaptive frequency-domain channel estimator (FD-CE) for equalization of space–time block code multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems in time-varying frequency-selective fading. The proposed adaptive FD–CE ensures the channel estimation accuracy in each set of four MIMO-OFDM symbols. Performance evaluation shows that the proposed method achieved a 10% packet error rate of 64 quadrature amplitude modulation (QAM) at 29.5 dB SNR under 120 km/h (Doppler shift is 266 Hz) in 4$ ,times,$4 MIMO-OFDM systems. To decrease complexity, the rich feature of Alamouti-like matrix is exploited to derive an efficient very large-scale integration (VLSI) solution. Finally, this adaptive FD-CE using an in-house 0.13-$ mu$ m CMOS library occupies an area of 3 $ ,times,$3.1 mm $^{2}$, and the 4 $ , times ,$4 MIMO-OFDM modem consumes about 62.8 mW at 1.2 V supply voltage.
机译:这项工作提出了一种自适应频域信道估计器(FD-CE),用于在时变频率选择性衰落中均衡空时分组码多输入多输出(MIMO)正交频分复用(OFDM)系统。所提出的自适应FD-CE可确保每组四个MIMO-OFDM符号中的信道估计精度。性能评估表明,该方法在4××4 MIMO-OFDM系统中,在120 km / h(多普勒位移为266 Hz)下,在29.5 dB SNR时,实现了64正交幅度调制(QAM)的10%分组误码率。为了降低复杂度,利用类似于Alamouti矩阵的丰富功能来推导高效的超大规模集成(VLSI)解决方案。最后,使用内部0.13- $ mu $ m CMOS库的这种自适应FD-CE占用的面积为3 $,3.1 mm $ ^ {2} $和4 $,4倍MIMO-OFDM调制解调器。在1.2 V电源电压下的功耗约为62.8 mW。

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