Question

Space-time Block Coding

Space-time block code (STBC) is an extension of block codes to the scenario with two or more transmit antennas. The simplest form of STBCs with two transmit antennas (also referred to as the Alamouti scheme) was proposed with error performance investigated by simulation. You are asked to evaluate the bit error performance of the scheme through computer simulation. You do need to obtain the error performance for one receive antenna for the Alamouti scheme ( 2Tx, 1Rx ). Plot the results versus SNR and discuss your observation and the expectation.

Answer 1

Space-time block coding (STBC) uses multiple antennas for transmitting data. The Alamouti scheme is a popular form of STBC with 2 transmit antennas and 1 receive antenna. To evaluate its bit error performance, computer simulations can be conducted and the results plotted against SNR.

Step-by-step explanation:

In space-time block coding (STBC), multiple antennas are used for transmitting data. The Alamouti scheme is a popular form of STBC with 2 transmit antennas and 1 receive antenna. To evaluate the bit error performance of the Alamouti scheme, you can conduct computer simulations and plot the results against SNR (Signal-to-Noise Ratio).

To simulate the Alamouti scheme, you can generate random binary data and pass it through the STBC encoder. The encoded data is then modulated and transmitted over the two antennas. At the receiver, the received signals are demodulated and passed through the STBC decoder. The decoded data can be compared with the original data to calculate the bit error rate.

By varying the SNR in the simulation, you can observe how the bit error rate changes. The expected behavior is that as the SNR increases, the bit error rate decreases, indicating better performance. This is because a higher SNR leads to a stronger received signal with less noise interference.