Search ETDs:
Investigation of Power Reduction Methods for Multi-User MIMO WLAN Applications
McCarthy, Stephen J.

2014, Master of Science in Engineering, University of Akron, Electrical Engineering.
The communications industry has recently begun focusing on energy efficiency of networking devices, one of which is wireless local area network (WLAN) access points. Access points are continuously improving performance, but many aspects of the access point hardware and software consume more power as performance increases, namely power amplifiers (PAs), microprocessors, and security features. Multi-user multiple-input multiple-output (MU-MIMO) communication, transmitting disparate data to multiple receiving devices at the same time in the same frequency spectrum, has been researched for some time, but has just been standardized and is now starting to be implemented in WLAN access points. The benefits of this system performance enhancement do not come without cost, one of which is system power consumption. Investigations have begun on methods of reducing this additional power consumption and the impact those power reductions have on system performance. Some, like coding schemes that reduce power consumption can also increase system complexity and may not be practical without knowledge of the coding scheme at both ends of the link. Power reduction techniques such as optimizing user scheduling for energy efficiency, improving the energy efficiency of channel sounding, or turning off particular transmit chains have the potential to limit the effective capacity in the overall access network. Peak-to-average power ratio reduction often comes at the cost of system complexity, bit error rate increases, and even bandwidth limitations. Still, experimentation in this study shows that it is possible to decrease power consumption without sacrificing signal integrity by reducing peak-to-average power ratios and changing the bias point of select power amplifiers currently available and suitable for use in multi-user MIMO systems. Unfortunately, most available amplifiers do not facilitate external bias control to reap savings of lower peak-to-average power ratio signals. Despite all the challenges, pursuing energy efficiency improvements in wireless networking is a worthwhile endeavor and, through all the challenges, steps are continually being taken to move toward more energy efficient networks.
Nathan Ida, Dr. (Advisor)
Hamid Bahrami, Dr. (Committee Member)
Nghi Tran, Dr. (Committee Member)
92 p.

Recommended Citations

Hide/Show APA Citation

McCarthy, S. (2014). Investigation of Power Reduction Methods for Multi-User MIMO WLAN Applications. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

Hide/Show MLA Citation

McCarthy, Stephen. "Investigation of Power Reduction Methods for Multi-User MIMO WLAN Applications." Electronic Thesis or Dissertation. University of Akron, 2014. OhioLINK Electronic Theses and Dissertations Center. 16 Dec 2017.

Hide/Show Chicago Citation

McCarthy, Stephen "Investigation of Power Reduction Methods for Multi-User MIMO WLAN Applications." Electronic Thesis or Dissertation. University of Akron, 2014. https://etd.ohiolink.edu/

Files

McCarthyS.the (final comments 1).pdf (821.22 KB) View|Download