在宽带无线通信中,与信道延迟扩展相比符号周期变得越来越小,此时发射信号要经历频率选择性衰落。通过结合空时编码与宽带正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术,提出了一种能够同时获得时间、空间和频率...在宽带无线通信中,与信道延迟扩展相比符号周期变得越来越小,此时发射信号要经历频率选择性衰落。通过结合空时编码与宽带正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术,提出了一种能够同时获得时间、空间和频率分集增益的分组正交空时频编码方法。该方法采用新的映射规则,降低了OFDM子载波之间的相关性。与已有的空时频编码方案相比,可获得更大的分集增益,改善了系统的误比特率性能,且并未导致系统的复杂度增加。展开更多
Making the authority of office of government at all levels more standardized and lawbased is an important step in the process of deepening financial reform and establishing fiscal and taxation systems governed by law....Making the authority of office of government at all levels more standardized and lawbased is an important step in the process of deepening financial reform and establishing fiscal and taxation systems governed by law.To do so,China needs to clarify further the legal division of authority of government at every level and protect and promote its exercise through legal mechanisms.Governments are given powers so that they may effectively protect citizens’basic interests.On the premise of clarifying the boundaries of government functions,we should use legal means and observe the principle of restraint in determining the scope of authority of office.The criteria for the division have both economic and legal aspects.Economic criteria are more basic;legal criteria make adjustments to the pattern of division derived from economic criteria.The authority of office can be divided into legislative supervision and enforcement.The current legal system allocates powers of legislative supervision quite rationally,but supervision of judicial powers in particular should be appropriately centralized.In terms of enforcement,some space is left for the division of administrative powers in the current system,and there is quite obvious homogeneity of powers between different levels of government.The legal division of authority of office requires that basic principles be stipulated in the Constitution and that a basic fiscal law be devised that clarifies the powers of all levels of government.Allocation of fiscal powers between governments and optimization of the transfer payment system,together with budget constraints,will provide an institutional guarantee for the division of these powers.Fundamentally,the legal confirmation of a system of civil rights can promote the implementation of statutory powers.展开更多
文摘在宽带无线通信中,与信道延迟扩展相比符号周期变得越来越小,此时发射信号要经历频率选择性衰落。通过结合空时编码与宽带正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术,提出了一种能够同时获得时间、空间和频率分集增益的分组正交空时频编码方法。该方法采用新的映射规则,降低了OFDM子载波之间的相关性。与已有的空时频编码方案相比,可获得更大的分集增益,改善了系统的误比特率性能,且并未导致系统的复杂度增加。
基金the 2013 National Social Science Fund Key Project “Innovative Research on Fiscal and Taxation Law Systems for Promoting the Equitable Distribution of Income”(13&ZD028)the 2012 National Social Science Fund Key Project “Research on a System of Laws for the Supervision of Public Finances”(12AFX013)
文摘Making the authority of office of government at all levels more standardized and lawbased is an important step in the process of deepening financial reform and establishing fiscal and taxation systems governed by law.To do so,China needs to clarify further the legal division of authority of government at every level and protect and promote its exercise through legal mechanisms.Governments are given powers so that they may effectively protect citizens’basic interests.On the premise of clarifying the boundaries of government functions,we should use legal means and observe the principle of restraint in determining the scope of authority of office.The criteria for the division have both economic and legal aspects.Economic criteria are more basic;legal criteria make adjustments to the pattern of division derived from economic criteria.The authority of office can be divided into legislative supervision and enforcement.The current legal system allocates powers of legislative supervision quite rationally,but supervision of judicial powers in particular should be appropriately centralized.In terms of enforcement,some space is left for the division of administrative powers in the current system,and there is quite obvious homogeneity of powers between different levels of government.The legal division of authority of office requires that basic principles be stipulated in the Constitution and that a basic fiscal law be devised that clarifies the powers of all levels of government.Allocation of fiscal powers between governments and optimization of the transfer payment system,together with budget constraints,will provide an institutional guarantee for the division of these powers.Fundamentally,the legal confirmation of a system of civil rights can promote the implementation of statutory powers.
