Abstract
Digital Communications, in relation to wireless networks, have taken off in recent years due to the expanding need to communicate faster and more efficiently. A popular way to achieve this is by using wireless Multiple Input Multiple Output (MIMO) communication systems. MIMO systems utilize Space Time Block Codes (STBC) as one of the leading ways to obtain higher data rates with limited bandwidth and power. With several STBC methods currently available, this paper analyzes simulations using Orthogonal Space Time Block Codes (OSTBC) in Rayleigh fading channels to evaluate the performance of MIMO systems. The selection to use a Rayleigh fading channel as a model for a non-line-of-sight (nLOS) environment is selected to mimic installations where a large number of signal paths and reflections are expected. All simulations are coded, generated and plotted using MATLAB resulting in graphical data representing the bit-error rate (BER) to signal-to-noise ratio (Eb/N0) or SNR. Each simulation captures how different configurations of key variables including code rate, diversity and antenna count can impact system performance. Four modulation schemes (BPSK, QPSK, 16-QAM and 64-QAM) are included in each simulation. Conclusive evidence based upon these simulations suggests higher diversity gains were achieved with a greater number of antennas. The most significant factor for increasing system performance was using a lower count of transmit antennas with a higher count of receive antennas.
Highlights
Multiple input multiple output (MIMO) systems are an efficient way to transmit large amounts of reliable data to multiple users in a wireless system
With several STBC methods currently available, this paper analyzes simulations using Orthogonal Space Time Block Codes (OSTBC) in Rayleigh fading channels to evaluate the performance of Multiple Input Multiple Output (MIMO) systems
Markets invested in 5G cellular and next-generation devices [2] will be reliant upon MIMO systems for the increased bandwidth capabilities in order to serve as many subscribers or end users as possible
Summary
Multiple input multiple output (MIMO) systems are an efficient way to transmit large amounts of reliable data to multiple users in a wireless system. MIMO systems can achieve increased bandwidth by enabling spatial multiplexing and diversity. It is important to realize that MIMO systems will help achieve a higher capacity for data rates and much more. An advantage to these systems is the demand for higher bandwidth is not needed as the entire system runs on the same frequency. Base and mobile stations from cellular carriers use a low number of antennas to drive a simpler, more cost-efficient design
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