Abstract
The main limitation of using a multiple antenna architecture is the complexity and high cost of the hardware in the radio frequency (RF) section, which rise with an increase in the number of antennas. In addition, RF circuit mismatches [1-3] and coupling [4] grow with an increase in the number of antennas; consequently, these factors also limit the use of high numbers of antennas at the transceiver.
One solution to compensate for the extra hardware cost and RF circuit imperfection is the utilization of a single RF front-end in a multiple input multiple output (MIMO) system, where a single RF path is used instead of multiple parallel RF paths. This results in an RF section that has lower complexity and cost, a simpler RF design, a compact size, and lower power consumption.
A conventional MIMO receiver with N antennas at the receiver is shown in Figure 10.1. The receiver uses multiple parallel RF front-ends, where the number of RF front-ends is equal to the number of antennas. In this architecture, the baseband processing section decodes N received baseband paths to recover the signal and obtain the diversity or spatial multiplexing gain. To realize a single RF frontend path, orthogonal transmission of multiple RF streams over a single front-end must be recognized. In the following subsections, the different techniques to realize a single RF front-end in a MIMO system are discussed.
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Mohammadi, A., Ghannouchi, F.M. (2012). Single RF Front-End MIMO Transceivers. In: RF Transceiver Design for MIMO Wireless Communications. Lecture Notes in Electrical Engineering, vol 145. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27635-4_10
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DOI: https://doi.org/10.1007/978-3-642-27635-4_10
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