The performance and efficiency of envelope elimination and restoration transmitters for future multiple-input multiple-output wireless local area networks


Nesimoglu T., Parker S. C. J. , Morris K. A. , McGeehan J. P.

IET COMMUNICATIONS, cilt.2, ss.473-483, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 2 Konu: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1049/iet-com:20070171
  • Dergi Adı: IET COMMUNICATIONS
  • Sayfa Sayıları: ss.473-483

Özet

The inefficiency of contemporary power amplifiers ( PAs), when operating in their linear region, is a major obstacle to mobile operation of wireless local area networks ( WLANs) based on IEEE 802.11n. Therefore the use of more efficient envelope elimination and restoration ( EER) transmitter architectures is considered. In addition to high efficiency it is also necessary to satisfy the spectral mask and achieve satisfactory link- level performance. Link- level simulations of a contemporary WLAN PA show that, at the power back- offs necessary to achieve sufficient linearity, the power added efficiency ( PAE) is only similar to 1% for a system with four transmit antennas. In contrast, simulations of a phase feedback EER PA architecture show that it is possible to achieve an average PAE of 70%, while satisfying the spectral mask, with only a small degradation in link- level performance.