INVESTIGADORES
GREGORIO Fernando Hugo
artículos
Título:
Receiver Cancellation Technique for Nonlinear Power Amplifier Distortion in SDMA?OFDM Systems
Autor/es:
FERNANDO GREGORIO; STEFAN WERNER; JUAN COUSSEAU; TIMO LAAKSO
Revista:
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Editorial:
IEEE
Referencias:
Lugar: Piscataway; Año: 2007 vol. 56 p. 2499 - 2516
ISSN:
0018-9545
Resumen:
Space-division multiple access (SDMA) and orthogonal
frequency-division multiplexing (OFDM) can be combined to
design a robust communications system with increased spectral
efficiency and system capacity. This combination is one of the
most promising candidates for future wireless local area network
implementations. However, one drawback of OFDM systems is the
high peak-to-average power ratio, which imposes strong requirements
on the linearity of power amplifiers (PAs). Such linearity
requirements translate into high back-off that results in low power
efficiency. In order to improve power efficiency, a PA nonlinearity
cancellation (PANC) technique is introduced in this paper. This
technique reduces the nonlinear distortion effects on the received
signal. The performance of the new technique is evaluated with
simulations, which show significant power efficiency improvements.
To obtain meaningful results for comparison purposes, we
derive a theoretical upper bound on the bit error rate performance
of an SDMA-OFDM system subject to PA nonlinearities.
In addition, a novel channel estimation technique that combines
frequency- and time-domain channel estimation with PANC is
also presented. Simulation results show the robustness of the
cancellation method also when channel estimation is included.
PA nonlinearity
cancellation (PANC) technique is introduced in this paper. This
technique reduces the nonlinear distortion effects on the received
signal. The performance of the new technique is evaluated with
simulations, which show significant power efficiency improvements.
To obtain meaningful results for comparison purposes, we
derive a theoretical upper bound on the bit error rate performance
of an SDMA-OFDM system subject to PA nonlinearities.
In addition, a novel channel estimation technique that combines
frequency- and time-domain channel estimation with PANC is
also presented. Simulation results show the robustness of the
cancellation method also when channel estimation is included.
(PANC) technique is introduced in this paper. This
technique reduces the nonlinear distortion effects on the received
signal. The performance of the new technique is evaluated with
simulations, which show significant power efficiency improvements.
To obtain meaningful results for comparison purposes, we
derive a theoretical upper bound on the bit error rate performance
of an SDMA-OFDM system subject to PA nonlinearities.
In addition, a novel channel estimation technique that combines
frequency- and time-domain channel estimation with PANC is
also presented. Simulation results show the robustness of the
cancellation method also when channel estimation is included.