Channel Estimation and Equalization in Multiuser Uplink OFDMA and SC-FDMA Systems Under Transmitter RF Impairments
| Autor: | Adnan Kiayani, Lauri Anttila, Mikko Valkama, Yaning Zou |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
Minimum mean square error Computer Networks and Communications Orthogonal frequency-division multiplexing business.industry Code division multiple access ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Transmitter Equalization (audio) Aerospace Engineering 020206 networking & telecommunications 020302 automobile design & engineering Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology 0203 mechanical engineering Carrier frequency offset Automotive Engineering Telecommunications link Computer Science::Networking and Internet Architecture 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering Transceiver business Computer Science::Information Theory |
| Zdroj: | IEEE Transactions on Vehicular Technology. 65:82-99 |
| ISSN: | 1939-9359 0018-9545 |
| Popis: | Single-carrier frequency-division multiple access (SC-FDMA), which is a modified form of orthogonal frequency-division multiple access (OFDMA), has been adopted as the uplink physical-layer radio access technique for the Third-Generation Partnership Project Long-Term Evolution (3GPP-LTE) and LTE-Advanced. Radio transceiver implementations for such OFDM-based systems with the direct-conversion architecture are desirable to enable small-size, low-cost, and low-power-consumption terminals. However, the associated circuit impairments stemming from the processing of analog radio frequency (RF) signals, such as in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset errors, can severely degrade the obtainable link performance. In this paper, we analyze the effects of these radio impairments in a multiuser SC-FDMA uplink system and present digital-signal-processing-based methods for the joint estimation and equalization of impairments and channel distortions on the receiver side with an arbitrary number of receiver antennas. For the equalization, linear equalizers such as the zero-forcing (ZF) and the minimum mean square error (MMSE) equalizers that utilize pairs of mirror subcarriers are formulated, and the MMSE equalizer is developed to effectively handle mirror subband users with different power levels. Furthermore, for reduced computational complexity, the joint channel and impairment filter responses are efficiently approximated with polynomial-based basis function models. The parameters of the basis functions are then estimated by exploiting the time-multiplexed reference symbols in the LTE uplink subframe structure. The performance of the proposed estimation and equalization methods is assessed with extensive multiuser link simulations, with both single-antenna and dual-antenna base-station receivers, and the results show that the proposed algorithms are able to significantly reduce the impact of channel distortions and radio impairments. The resulting receiver implementation with the proposed techniques enables improved uplink link performance, even when the mobile terminals fulfill their emission requirements, in terms of I/Q images, with no changes in the LTE standard's frame and pilot structures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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