To overcome the bad performance in combating fading of BLAST and low code rate of STBC, a layered structure STBC is introduced in this article by combining BLAST and STBC.

主要介绍了发射分集技术中用于抗信道衰落和提高系统容量的空时分组码和分层空时码的原理和基本特点，并对这些空时编码技术进行了性能分析。

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On top of that, the Simpson Bowles plan calls for the tax code to be overhauled, with tax rates reduced and almost all tax breaks (including the special low rate for capital gains and dividends) eliminated or curbed.

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