blog




  • Essay / MIMO performance and status number under the SNR given in...

    IntroductionLTE (Long Term Evolution) products are rapidly seen in the market nowadays and many more products are expected in the future. With 5G proposed and expected around 2020, engineers must work and test these new products quickly. However, the complexity of these devices does not make this task easy. There are many performance metrics to consider, such as SNR, SIR, capacity and many others, as well as different features that may be required to achieve the desired results. For the purposes of this project, I will be evaluating a review from Agilent Technologies that describes how to quickly determine whether a MIMO channel is capable of supporting spatial multiplexing when given a particular signal-to-noise ratio (SNR). The term “condition number” will also be introduced when it comes to MIMO transmission recovery. Many wireless systems used today have improved data capacity through the multi-antenna system. However, not all MIMO wireless systems are suitable for spatial multiplexing. In order to benefit from this advantage, the wireless channel must have the appropriate antenna configuration and have the ability to accurately recover the coefficients from the channel coupling matrix. As mentioned earlier, engineers face many complexities when dealing with wireless channels. Among these complexities are channel correlation and interference/noise rates. This is where calculating the condition number comes in handy. The condition number is a deterministic calculation that evaluates the performance of a wireless channel while estimating the demodulation SNR for an LTE MIMO system. The goal would be to get the condition number as close to 0 dB as possible and try to avoid anything above 10 dB....... middle of paper ......or average correlation > >H = evcdf (x,0.9,3) %cdf for high correlation>>plot(x, L, x, M, x, H); %three plotsReferences[1] Agilent Application Note, MIMO Channel Modeling and Emulation Test Challenges, literature number 5989-8973N, October 2008.[2] Agilent Technologies, MIMO Performance and Condition Number in LTE Test, literature number 5990-4759EN, October 5, 2009.[3] Advanced Engineering Mathematics, Erwin Kreyszig, 6th edition, p. 1025-26, 1988.[4] LTE and the Evolution to 4G Wireless: Design and Measurement Challenges, AgilentTechnologies, 2nd Edition, Chapter 6, April 1, 2013.[5] Cumulative distribution curves, MathWorks, documentation R2014a[6] Condition number of a matrix, MathWorks, documentation R2014a[7] Rohde & Schwarz: “Evaluation of a MIMO channel”, application note 1SP18, 2010