12 Questions
What is the purpose of an encoder in a MIMO system?
To convert the signal into a format suitable for transmission
What is the assumption made about the wireless propagation channel in a MIMO system?
It is quasi-static and frequency-flat
What type of MIMO channel model is based on electromagnetic wave propagation?
Physical model
What is the main reason for the difference in performance between AWGN channels and Rayleigh fading channels?
The fading of the channel
What is the minimum SNR required to achieve a BER of 10^-4 in AWGN channels?
10 dB
What is the role of the transmit antennas in a MIMO system?
To send the signal through the wireless channel
What is the principle of diversity in wireless communication systems?
To ensure that the same information reaches the RX on statistically independent channels
What is the characteristic of a quasi-static channel?
The coherence time of the channel is long enough to transmit a large number of bits
What is the purpose of phase shifting in a MIMO system?
To make phase correction equal
What is the effect of fading on the BER in wireless communication systems?
It makes the BER decrease linearly with the SNR
What is the purpose of using diversity in wireless communication systems?
To make sure that the SNR has a smaller probability of being low
What is the condition required for uncorrelated Rayleigh channels?
When the antenna spacings and/or the angular spreading of the energy at both sides of the link are large enough
Test your understanding of multi antenna techniques in cellular telephony, including the principles of diversity and its effects on Bit Error Rate (BER) in different channel conditions. Learn about the differences between AWGN and Rayleigh fading channels.
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