Multiple-antenna systems and multiuser communications: Fundamentals and an overview of software-based modeling techniques

Guo, Sheng; Wang, Yuxin; Lv, Zhihan; Song, Houbing

doi:10.1016/j.compeleceng.2016.08.015

Cited by 6 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the one hand, since the number of user devices is likely to dramatically increase in the future, radio access networks are expected to support multiple access of massive users and achieve a higher spectrum efficiency [10–12]. Meanwhile, to avoid that the resulting overheads consume the scarce channel resource in CR networks, random access becomes an attractive option of multiple access due to the reduction of overheads for successful SU transmissions [13, 14].…”

Section: Introductionmentioning

confidence: 99%

Non-Orthogonal Random Access in MIMO Cognitive Radio Networks: Beamforming, Power Allocation, and Opportunistic Transmission

Lin¹,

Shin²

2017

PLoS ONE

View full text Add to dashboard Cite

We study secondary random access in multi-input multi-output cognitive radio networks, where a slotted ALOHA-type protocol and successive interference cancellation are used. We first introduce three types of transmit beamforming performed by secondary users, where multiple antennas are used to suppress the interference at the primary base station and/or to increase the received signal power at the secondary base station. Then, we show a simple decentralized power allocation along with the equivalent single-antenna conversion. To exploit the multiuser diversity gain, an opportunistic transmission protocol is proposed, where the secondary users generating less interference are opportunistically selected, resulting in a further reduction of the interference temperature. The proposed methods are validated via computer simulations. Numerical results show that increasing the number of transmit antennas can greatly reduce the interference temperature, while increasing the number of receive antennas leads to a reduction of the total transmit power. Optimal parameter values of the opportunistic transmission protocol are examined according to three types of beamforming and different antenna configurations, in terms of maximizing the cognitive transmission capacity. All the beamforming, decentralized power allocation, and opportunistic transmission protocol are performed by the secondary users in a decentralized manner, thus resulting in an easy implementation in practice.

show abstract

Section: Introductionmentioning

confidence: 99%

Non-Orthogonal Random Access in MIMO Cognitive Radio Networks: Beamforming, Power Allocation, and Opportunistic Transmission

Lin¹,

Shin²

2017

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…It is noteworthy that the sensor nodes are the energy-constrained, cost-constrained, and lightweight computing devices, in which a considerable portion of the available energy is allocated to support the core sensorial and computational capabilities. Hence, there is possibly little left over to provide the security [7,8,9,10,11,12]. As such, it is of interest to explore efficient and low-complexity protocols to guarantee the secrecy of WSNs.…”

Section: Introductionmentioning

confidence: 99%

Secure Multiuser Communications in Wireless Sensor Networks with TAS and Cooperative Jamming

Yang

Zhang

Huang

et al. 2016

Sensors

View full text Add to dashboard Cite

In this paper, we investigate the secure transmission in wireless sensor networks (WSNs) consisting of one multiple-antenna base station (BS), multiple single-antenna legitimate users, one single-antenna eavesdropper and one multiple-antenna cooperative jammer. In an effort to reduce the scheduling complexity and extend the battery lifetime of the sensor nodes, the switch-and-stay combining (SSC) scheduling scheme is exploited over the sensor nodes. Meanwhile, transmit antenna selection (TAS) is employed at the BS and cooperative jamming (CJ) is adopted at the jammer node, aiming at achieving a satisfactory secrecy performance. Moreover, depending on whether the jammer node has the global channel state information (CSI) of both the legitimate channel and the eavesdropper’s channel, it explores a zero-forcing beamforming (ZFB) scheme or a null-space artificial noise (NAN) scheme to confound the eavesdropper while avoiding the interference to the legitimate user. Building on this, we propose two novel hybrid secure transmission schemes, termed TAS-SSC-ZFB and TAS-SSC-NAN, for WSNs. We then derive the exact closed-form expressions for the secrecy outage probability and the effective secrecy throughput of both schemes to characterize the secrecy performance. Using these closed-form expressions, we further determine the optimal switching threshold and obtain the optimal power allocation factor between the BS and jammer node for both schemes to minimize the secrecy outage probability, while the optimal secrecy rate is decided to maximize the effective secrecy throughput for both schemes. Numerical results are provided to verify the theoretical analysis and illustrate the impact of key system parameters on the secrecy performance.

show abstract

ASIP development of a real-time control module for a retrodirective antenna array

Engroff

Girardi

Heckler

et al. 2019

AEU - International Journal of Electronics and Communications

View full text Add to dashboard Cite

Multiple-antenna systems and multiuser communications: Fundamentals and an overview of software-based modeling techniques

Cited by 6 publications

References 29 publications

Non-Orthogonal Random Access in MIMO Cognitive Radio Networks: Beamforming, Power Allocation, and Opportunistic Transmission

Non-Orthogonal Random Access in MIMO Cognitive Radio Networks: Beamforming, Power Allocation, and Opportunistic Transmission

Secure Multiuser Communications in Wireless Sensor Networks with TAS and Cooperative Jamming

ASIP development of a real-time control module for a retrodirective antenna array

Contact Info

Product

Resources

About