On effects of imperfect channel state information on null space based cognitive MIMO communication

Sodagari, Shabnam

doi:10.1109/iccnc.2015.7069384

Cited by 4 publications

(5 citation statements)

References 19 publications

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“…However, shadowing and multipath fading may cause that the autocorrelation matrices in (11) and (12) differ in rank, leading to two possible situations…”

Section: Minimum-norm Waveform Optimizationmentioning

confidence: 99%

“…Traditional null space techniques propose transmitting over the noise subspace taking advantage of the second-order statistics of the aforementioned channel. Even though these techniques overcome the implementation issues by using the noise eigenvectors [10], [11], there is still a persisting ambiguity among the adopted noise eigenvectors due to the lack of rotational invariance, leading to non-coherent detection.…”

Section: Introductionmentioning

confidence: 99%

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Dimension spreading for coherent opportunistic communications

Borras

Font-Segura

Riba

et al. 2017

2017 51st Asilomar Conference on Signals, Systems, and Computers

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The waveform optimization problem for opportunistic communications is addressed, based on sensing the secondorder statistics of the existing transmissions. We propose a minimum-norm waveform optimization that exhibits robustness to the worst-case subspace mismatch, minimizes the spectral overlapping with the existing transmissions, is rotationally invariant, and has maximally white spectrum. The derived solution can be seen as a different kind of signal dimension-based spreading. In addition, the effects of the residual interference caused to the existing transmissions are studied. Numerical results are provided to assess the performance of the proposed solution in the frequency domain for the asymptotic case. The level of induced interference is compared to traditional null space techniques.

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“…However, shadowing and multipath fading may cause that the autocorrelation matrices in (11) and (12) differ in rank, leading to two possible situations…”

Section: Minimum-norm Waveform Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dimension spreading for coherent opportunistic communications

Borras

Font-Segura

Riba

et al. 2017

2017 51st Asilomar Conference on Signals, Systems, and Computers

View full text Add to dashboard Cite

show abstract

“…For instance, noise subspace-based waveforms are used to precode opportunistic signals. The main dissemblance between different strategies is that side information may be acquired statistically [5], [6], imperfectly [7][8][9] or instantaneously [10][11][12]. References therein are suggested to the reader for further information.…”

Section: Introductionmentioning

confidence: 99%

Uncoordinated Space-Frequency Pilot Design for Multi-Antenna Wideband Opportunistic Communications

Borras

Vazquez

2018

2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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The statistical side information of interference channels is exploited in this paper to derive a novel uncoordinated on-line pilot design strategy for opportunistic communications. Assuming a time division duplex (TDD), or frequency division duplex (FDD) with feedback, wireless network and reciprocity, we prove that the space-frequency pilot design technique in terms of minimum cross-interference to external-network users reduces to a classical minimum-norm problem. The advantages of this novel methodology are time-domain invariance to noise-subspace rotations, a maximally flat angle-frequency response, and robustness in front of frequency calibration errors. Simulation results are reported to assess the performance of the proposed strategy and the advantages of its low-resolution quantization in low signal-tonoise ratio (low-SNR) regimes. Index Terms-Opportunistic communications, pilot and waveform design, multi-antenna systems, distributed networks, wideband regime.

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“…, g ] . To calculate M by singular value decomposition (SVD) [26], the projection matrix is derived from the following equations:…”

Section: Projection Matrixmentioning

confidence: 99%

On the Secrecy Capacity of 5G New Radio Networks

Xiao

Zhang

2018

Wireless Communications and Mobile Computing

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The new radio technology for the fifth-generation wireless system has been extensively studied all over the world. Specifically, the air interface protocols for 5G radio access network will be standardized by the 3GPP in the coming years. In the next-generation 5G new radio (NR) networks, millimeter wave (mmWave) communications will definitely play a critical role, as new NR air interface (AI) is up to 100 GHz just like mmWave. The rapid growth of mmWave systems poses a variety of challenges in physical layer (PHY) security. This paper investigates those challenges in the context of several 5G new radio communication technologies, including multiple-input multiple-output (MIMO) and nonorthogonal multiple access (NOMA). In particular, we introduce a ray-tracing (RT) based 5G NR network channel model and reveal that the secrecy capacity in mmWave band widely depends on the richness of radio frequency (RF) environment through numerical experiments.

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On effects of imperfect channel state information on null space based cognitive MIMO communication

Cited by 4 publications

References 19 publications

Dimension spreading for coherent opportunistic communications

Dimension spreading for coherent opportunistic communications

Uncoordinated Space-Frequency Pilot Design for Multi-Antenna Wideband Opportunistic Communications

On the Secrecy Capacity of 5G New Radio Networks

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