MIMO channels: optimizing throughput and reducing outage by increasing multiplexing gain

• Published in: Telkomnika Vol. 18; no. 1; pp. 419 - 448
• Main Authors: Agboje, Oboyerulu, Nkordeh, Nsikan, Idiake, Uzairue Stanley, Oladoyin, Ololade, Okokpujie, Kennedy, Bob-Manuel, Ibinabo
• Format: Journal Article
• Language: English
• Published: Yogyakarta Ahmad Dahlan University 01.02.2020
• Subjects: Antennas; Bandwidths; Channel capacity; Communication channels; Communications systems; Data transmission; Efficiency; Information theory; Multiplexing; Noise; Shannon theorem; Signal to noise ratio; Wireless communications
• ISSN: 1693-6930; 2302-9293
• DOI: 10.12928/telkomnika.v18i1.8720

With MIMO, the capacity of a communication system increases linearly with the number of antennas, thereby achieving an increase in spectral efficiency, without requiring more resources in terms of bandwidth and power [3-5]. In low SNR environment, spatial diversity techniques are applied to mitigate fading and the performance gain is typically expressed as diversity gain (in dB) [6]; for higher SNR facilitates the use of spatial multiplexing (SM), i.e., the transmission of parallel data streams, and information theoretic capacity in bits per second per Hertz (bits/s/Hz) is the performance measure of choice [7]. According to the Shannon-Hartley theorem: the Capacity C of a radio channel is dependent on the bandwidth В and the signal to noise ration s/n ... Reliable communication at rates arbitrarily close to the ergodic capacity requires averaging across many independent realizations of the channel gains over time. Since the channel capacity increases linearly with log SNR, in order to achieve a certain fraction of the capacity at high SNR, we should consider schemes that support a data rate which also increases with SNR.