In this paper performances of wavelet transform domain (WTD) adaptive equalizers based on the least mean￣square (LMS) algorithm are analyzed. The optimum Wiener solution, the condition of convergence, the minimum ...In this paper performances of wavelet transform domain (WTD) adaptive equalizers based on the least mean￣square (LMS) algorithm are analyzed. The optimum Wiener solution, the condition of convergence, the minimum mean square error (MSE) and the steady state excess MSE of the WTD adaptive equalizer are obtained. Constant and time varying convergence factor adaptive algorithms are studied respectively. Computational complexities of WTD LMS equalizers are given. The equalizer in WTD shows much better convergence performance than that of the conventional in time domain.展开更多
A pilot pattern across two orthogonal frequency division multiplexing OFDM symbols with a special structure is designed for the channel estimation of OFDM systems with inphase and quadrature IQ imbalances at the recei...A pilot pattern across two orthogonal frequency division multiplexing OFDM symbols with a special structure is designed for the channel estimation of OFDM systems with inphase and quadrature IQ imbalances at the receiver.A high-efficiency time-domain TD least square LS channel estimator and a low-complexity frequency-domain Gaussian elimination GE equalizer are proposed to eliminate IQ distortion.The former estimator can significantly suppress channel noise by a factor N/L＋1 over the existing frequency-domain FD LS where N and L＋1 are the total number of subcarriers and the length of cyclic prefix and the proposed GE requires only 2N complex multiplications per OFDM symbol.Simulation results show that by exploiting the TD property of the channel the proposed TD-LS channel estimator obtains a significant signal-to-noise ratio gain over the existing FD-LS one whereas the proposed low-complexity GE compensation achieves the same bit error rate BER performance as the existing LS one.展开更多
Since the founding of the People’s Republic of China in 1949,China’s regional development strategy has experienced three stages-the balanced development strategy before reform and opening up in 1978,imbalanced devel...Since the founding of the People’s Republic of China in 1949,China’s regional development strategy has experienced three stages-the balanced development strategy before reform and opening up in 1978,imbalanced development strategy since 1978,and the present coordinated development stage.Each stage has its own priorities and characteristics of historical context and offers valuable experience for China’s regional economic development.Reviewing the journey and historic characteristics of China’s regional economic development is of great theoretical and relevant significance to its balanced regional economic development in the new era.Experience shows that in the strategic choice of regional development,importance should be given to the proper handling of relationships between efficiency and fairness,government and market,equilibrium and disequilibrium,and central and local governments.In general,China’s regional economic development has achieved tremendous progress since 1949,particularly since 1978 as manifested in favorable regional development momentum and balanced regional development.Nevertheless,imbalanced and inadequate regional development remain prominent contradictions.In the new era,we must follow Xi Jinping thought on socialism with Chinese characteristics as guidance,implement the strategy of balanced regional development,and bring about a new development pattern characterized by equal access to basic public services,relatively balanced infrastructure accessibility and generally equal living standards.展开更多
Necessary and sufficient conditions are given for the existence of the general solution, the centrosymmetric solution, and the centroskewsymmetric solution to a system of linear matrix equations over an arbitrary skew...Necessary and sufficient conditions are given for the existence of the general solution, the centrosymmetric solution, and the centroskewsymmetric solution to a system of linear matrix equations over an arbitrary skew field. The representations of such the solutions of the system are also derived.展开更多
文摘In this paper performances of wavelet transform domain (WTD) adaptive equalizers based on the least mean￣square (LMS) algorithm are analyzed. The optimum Wiener solution, the condition of convergence, the minimum mean square error (MSE) and the steady state excess MSE of the WTD adaptive equalizer are obtained. Constant and time varying convergence factor adaptive algorithms are studied respectively. Computational complexities of WTD LMS equalizers are given. The equalizer in WTD shows much better convergence performance than that of the conventional in time domain.
基金The Open Research Fund of National Mobile Communications Research Laboratory of Southeast University(No.2013D02)the Fundamental Research Funds for the Central Universities(No.30920130122004)the National Natural Science Foundation of China(No.61271230,61472190)
文摘A pilot pattern across two orthogonal frequency division multiplexing OFDM symbols with a special structure is designed for the channel estimation of OFDM systems with inphase and quadrature IQ imbalances at the receiver.A high-efficiency time-domain TD least square LS channel estimator and a low-complexity frequency-domain Gaussian elimination GE equalizer are proposed to eliminate IQ distortion.The former estimator can significantly suppress channel noise by a factor N/L＋1 over the existing frequency-domain FD LS where N and L＋1 are the total number of subcarriers and the length of cyclic prefix and the proposed GE requires only 2N complex multiplications per OFDM symbol.Simulation results show that by exploiting the TD property of the channel the proposed TD-LS channel estimator obtains a significant signal-to-noise ratio gain over the existing FD-LS one whereas the proposed low-complexity GE compensation achieves the same bit error rate BER performance as the existing LS one.
文摘Since the founding of the People’s Republic of China in 1949,China’s regional development strategy has experienced three stages-the balanced development strategy before reform and opening up in 1978,imbalanced development strategy since 1978,and the present coordinated development stage.Each stage has its own priorities and characteristics of historical context and offers valuable experience for China’s regional economic development.Reviewing the journey and historic characteristics of China’s regional economic development is of great theoretical and relevant significance to its balanced regional economic development in the new era.Experience shows that in the strategic choice of regional development,importance should be given to the proper handling of relationships between efficiency and fairness,government and market,equilibrium and disequilibrium,and central and local governments.In general,China’s regional economic development has achieved tremendous progress since 1949,particularly since 1978 as manifested in favorable regional development momentum and balanced regional development.Nevertheless,imbalanced and inadequate regional development remain prominent contradictions.In the new era,we must follow Xi Jinping thought on socialism with Chinese characteristics as guidance,implement the strategy of balanced regional development,and bring about a new development pattern characterized by equal access to basic public services,relatively balanced infrastructure accessibility and generally equal living standards.
基金Supported by the National Natural Science Foundation of China(10471085)
文摘Necessary and sufficient conditions are given for the existence of the general solution, the centrosymmetric solution, and the centroskewsymmetric solution to a system of linear matrix equations over an arbitrary skew field. The representations of such the solutions of the system are also derived.
