Abstract
OFDM modulation is extensively used in many
applications. However, it also exhibits high peak-to-average power ratios (PAPR) requiring the associated transmit amplifier
to have a very large linear region. This linear amplifier does therefore have poor power efficiency. To reduce the PAPR, clipping and filtering was carried out at baseband. This paper investigates the impact that clipping has on the resultant power efficiency and BER. The simulations show that when the input back-off (IBO) dynamically controls the input average power in every OFDM symbol, for a 64-subcarrier QPSK OFDM signal, the power efficiency can be improved by 55% without increasing
the bit error rate
| Translated title of the contribution | Increasing the power efficiency of an IEEE802.11a power amplifier |
|---|---|
| Original language | English |
| Title of host publication | Vehicular Technology Conference 2005 (VTC 2005-Spring) |
| Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
| ISBN (Print) | 0780388879 |
| Publication status | Published - May 2005 |
| Event | 61st Vehicular Technology Conference 2005 (VTC 2005-Spring) - Stockholm, Sweden Duration: 1 May 2005 → … |
Conference
| Conference | 61st Vehicular Technology Conference 2005 (VTC 2005-Spring) |
|---|---|
| Country/Territory | Sweden |
| City | Stockholm |
| Period | 1/05/05 → … |
Bibliographical note
Conference Proceedings/Title of Journal: IEEE 61st Vehicular Technology Conference, 2005 (VTC 2005-Spring)Rose publication type: Conference contribution
Sponsorship: The work reported in this paper has formed part of the Wireless Enablers area of the Core 3 Research Programme of the Virtual Centre of Excellence in Mobile & Personal
Communications, Mobile VCE, whose funding support, including that of EPSRC, is gratefully acknowledged
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Keywords
- OFDM
- clipping
- Power amplifier
- Power efficiency