Link Adaptation of Precoded MIMO-OFDMA System With I/Q Interference

Oruthota, Udesh; Tirkkonen, Olav

doi:10.1109/tcomm.2015.2391180

Cited by 6 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Next, by selecting a suitable backoff, a suitable modulation and coding scheme can be chosen, which support a target outage probability. An example of such SINR-statistics aware link adaptation related to interferer precoding variation can be found in [17].…”

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks

2016

Self Cite

View full text Add to dashboard Cite

This paper addresses robust link adaptation for a precoded downlink multiple input single output (MISO) system, for guaranteeing ultra-reliable (99.999%) transmissions to mobile users served by a small cell network (e.g. slowly moving machines in a factory). Effects of inaccurate channel state information (CSI) caused by user mobility and varying precoders in neighboring cells are mitigated. Both of these impairments translate to changes of received signal-to-noise plus interference ratios (SINRs), leading to CSI mispredictions and potentially erroneous transmissions. Knowing the statistics of the propagation channels and the precoder variation, backoff values can be selected to guarantee robust link adaptation. Combining this with information on the current channel state, transmissions can be adapted to have a desired reliability. Theoretical analysis accompanied by simulation results show that the proposed approach is suitable for attaining 5G ultra-reliability targets in realistic settings.

show abstract

Section: Related Workmentioning

confidence: 99%

“…This channel model extends readily to a situation where the interferer is a higher rank transmission. As rank-1 interference is the worst [17], we concentrate on it in the following discussion.…”

Section: Sinr Estimationmentioning

confidence: 99%

Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Finally, studies in [493], [494] explore the IQ imbalance impacts in multiuser OFDM systems where the base station and users are equipped with multiple antennas. In [493], the distribution of uncompensated IQ interference and SINR in a precoded downlink MIMO OFDMA system is studied.…”

Section: Iq Imbalance In Emerging/future Technologies 1) Mimo Systemsmentioning

confidence: 99%

RF Impairments in Wireless Transceivers: Phase Noise, CFO, and IQ Imbalance – A Survey

Mohammadian

Tellambura

2021

IEEE Access

View full text Add to dashboard Cite

Wireless transceivers for mass-market applications must be cost effective. We may achieve this goal by deploying non-ideal low-cost radio frequency (RF) analog components. However, their imperfections may result in RF impairments, including phase noise (PN), carrier frequency offset (CFO), and in-phase (I) and quadrature-phase (Q) imbalance. These impairments introduce in-band and out-of-band interference terms and degrade the performance of wireless systems. In this survey, we present RF-impairment signal models and discuss their impacts. Moreover, we review RF-impairment estimation and compensation in singlecarrier (SC) and multicarrier systems, especially orthogonal frequency division multiplexing (OFDM). Furthermore, we discuss the effects of the RF impairments in already-established wireless technologies, e.g., multiple-input multiple-output (MIMO), massive MIMO, full-duplex, and millimeter-wave communications and review existing estimation and compensation algorithms. Finally, future research directions investigate the RF impairments in emerging technologies, including cell-free massive MIMO communications, nonorthogonal multicarrier systems, non-orthogonal multiple access (NOMA), ambient backscatter communications, and intelligent reflecting surface (IRS)-assisted communications. Furthermore, we discuss artificial intelligence (AI) approaches for developing estimation and compensation algorithms for RF impairments.

show abstract

“…Adaptive coding and modulation techniques seek to adapt the transmission parameters of a system to the conditions of time-varying channels in order to ensure a more robust and spectrally-efficient transmission [ 26 , 27 ]. The fundamental parameters to be adapted include coding and modulation, but other parameters can be adjusted, such as power levels.…”

Section: System Descriptionmentioning

confidence: 99%

Adaptive Wavelet Coding Applied in a Wireless Control System

Gama

Silveira

Salazar

2017

Sensors

View full text Add to dashboard Cite

Wireless control systems can sense, control and act on the information exchanged between the wireless sensor nodes in a control loop. However, the exchanged information becomes susceptible to the degenerative effects produced by the multipath propagation. In order to minimize the destructive effects characteristic of wireless channels, several techniques have been investigated recently. Among them, wavelet coding is a good alternative for wireless communications for its robustness to the effects of multipath and its low computational complexity. This work proposes an adaptive wavelet coding whose parameters of code rate and signal constellation can vary according to the fading level and evaluates the use of this transmission system in a control loop implemented by wireless sensor nodes. The performance of the adaptive system was evaluated in terms of bit error rate (BER) versus Eb/N0 and spectral efficiency, considering a time-varying channel with flat Rayleigh fading, and in terms of processing overhead on a control system with wireless communication. The results obtained through computational simulations and experimental tests show performance gains obtained by insertion of the adaptive wavelet coding in a control loop with nodes interconnected by wireless link. These results enable the use of this technique in a wireless link control loop.

show abstract

Link Adaptation of Precoded MIMO-OFDMA System With I/Q Interference

Cited by 6 publications

References 36 publications

Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks

Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks

RF Impairments in Wireless Transceivers: Phase Noise, CFO, and IQ Imbalance – A Survey

Adaptive Wavelet Coding Applied in a Wireless Control System

Contact Info

Product

Resources

About