Peak-to-average power reduction of OFDM signals by convex optimization: experimental validation and performance optimization
2011 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, Vol. 60, no 2, 473-479 p.Article in journal (Refereed) Published
We evaluated the application of the convex optimization to peak-to-average power reduction on an orthogonal frequency division multiplexing (OFDM) 802.11a signal. A radio frequency power amplifier was excited with an OFDM signal, and the peak-to-average reduced counterpart and its performance figure of merits were measured and compared. A state-of-the-art radio frequency test system with high accuracy was used for this purpose. Improvements due to the optimization in the output power and power-added efficiency and the influence of the power distribution in the excitation signal on power amplifier performance were investigated. Improvements of 6 dB in output power and 6.5% in power-added efficiency were achieved on average near the operating region. The effect of preserving power-free guard subcarriers was introduced in the optimization algorithm and investigated regarding adjacent channel interference. An improvement of 9 dB from that aspect was observed using half of the power-free subcarriers, which reveals the importance of a guard interval.
Place, publisher, year, edition, pages
2011. Vol. 60, no 2, 473-479 p.
Communication system performance, convex optimization, dirty radio, power amplifiers, power-added efficiency (PAE), spectrum mask
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-24530DOI: 10.1109/TIM.2010.2050360ISI: 000286008700014ScopusID: 2-s2.0-78651273904OAI: oai:DiVA.org:kth-24530DiVA: diva2:351283
FunderICT - The Next Generation
QC 201507272010-09-302010-09-132015-07-27Bibliographically approved