EE620-HW-04-solutions

EE620-HW-04-solutions - 1 EE 620: MIMO Wireless...

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Unformatted text preview: 1 EE 620: MIMO Wireless Communications Solutions for Homework #4: 1. (a) * 1 2 3 1 2 3 * * * 2 1 3 2 1 3 4 4 * * * 3 1 2 3 1 2 * * * * * 3 2 1 3 2 1 0 0 0 0 0 0 H x x x x x x x x x x x x G G x x x x x x x x x x x x -- -- = -- -- 2 2 2 * * * * 1 2 3 1 2 1 2 1 3 1 3 2 3 2 3 2 2 2 * * * * 1 2 1 2 2 1 3 2 3 2 3 1 3 1 3 * * 1 3 1 3 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x + +--- +- + +-- =- ( ) 2 2 2 * * 2 3 2 3 3 1 2 1 2 1 2 2 2 2 * * * * * * * * * * * * 2 3 2 3 1 3 1 3 1 2 1 2 3 2 1 2 2 2 1 2 3 4 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x I - + +- + - +-- + + + = + + (b) The rate of this design is defined as 3 4 k p = which means that a codeword of time delay p carries k information symbols. And two bits select one symbol. Thus, the spectral efficiency is 3 2 1.5 4 =...
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EE620-HW-04-solutions - 1 EE 620: MIMO Wireless...

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