Experimental results for low overhead frequency offset estimation in MANETs with concurrent transmission

Kauffroath, Nicholas; Karbasi, Kia; Zhao, Heng; Daneshrad, Babak; Pottie, Gregory J.

doi:10.1109/milcom.2017.8170847

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…This burst structure is depicted in with this approach to verify the concept of our demo system and SNR aggregation. The demo system's modularity can be utilized to interchange the sequential implementation with concurrent estimation techniques, whose feasibility has been demonstrated in related research, e. g. in [11], at any time. Accordingly, constraints to the scalability because of the parameter estimation can be avoided.…”

Section: Channel State Estimationmentioning

confidence: 99%

SDR-based Demonstration System and Applicability of SNR Aggregation for Multistage Distributed Cooperative Communication in MANETs

Yüksel,

Rolny,

Kuhn

et al. 2023

2023 IEEE 97th Vehicular Technology Conference (VTC2023-Spring)

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Multistage or hierarchical distributed cooperative communication on the physical layer is a promising approach to overcome the scalability limitation of Mobile Ad-hoc Networks (MANETs). Standalone nodes that could successfully decode messages join transmission and support each other. They become a virtual transmit cluster and send simultaneously.While information theoretic research has demonstrated that an approximately linear scaling behaviour can be achieved, imperfections and constraints of practical systems have not been taken into account. Within this paper, we present a scalable and modular low-cost demonstration system based on software-defined radios (SDRs) to study distributed cooperative communication in practical MANETs. Furthermore, we apply SNR aggregation in combination with distributed cooperative transmission. To this end, we show a practical implementation approach and investigate the performance by measurements and simulations. Our results clearly highlight the advantages of combining distributed cooperative communication and SNR aggregation, e. g. to overcome larger distances in a distributed long haul multiple-input single-output (MISO) scenario or to enable a more efficient broadcast.

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Section: Channel State Estimationmentioning

confidence: 99%

SDR-based Demonstration System and Applicability of SNR Aggregation for Multistage Distributed Cooperative Communication in MANETs

Yüksel,

Rolny,

Kuhn

et al. 2023

2023 IEEE 97th Vehicular Technology Conference (VTC2023-Spring)

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show abstract

“…For the performed simulations, it is assumed that the RX has perfect knowledge about the channel state information as well as perfect knowledge about each TX' CFO and each link's delay. Such a precise parameter estimation is reasonable, as the feasibility of varying approaches has been demonstrated in theory [14] and with low-complexity SDRs [15]. With regard to the large coherence time in comparison to the symbol duration, it becomes apparent that aiming for diversity over time would be disadvantageous for such a setup.…”

Section: B Exemplarily Ofdm Designmentioning

confidence: 99%

Multi-Carrier (OFDM) Cooperative Transmission in MANETs with Multiple Carrier Frequency Offsets

Yuksel

Rolny²,

Kuhn

et al. 2022

2022 18th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob)

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Cooperative transmission, realized by aggregating several nodes to a virtual multiple input system, is an auspicious approach to establish a more robust and effective communication in MANETs. In such a setup, impairments, i. e. multiple timing and carrier frequency offsets (TO, CFO) will occur. While multi-carrier schemes, e. g. Orthogonal Frequency Division Multiplexing (OFDM), are well-known to mitigate the impact of multipath propagation and TO, multiple CFO causes inter-carrier-interference (ICI) which typically degrades the performance significantly. Within this paper, we propose an effective code and equalizer structure that allows to overcome this limitation. It mitigates the impact of multiple CFO that can be significantly larger than the subcarrier spacing with a reasonable computational effort. For that, we utilize inherent code properties of Linear-Scalable Dispersion Codes (LSDCs) and propose a communication system composed of an equalizer structure in combination with LSDCs that enables multi-carrier distributed cooperative transmission for practical MANETs with high node mobility. We demonstrate the benefits of cooperative transmission in comparison to classical non-cooperative multihop or concurrent transmission by outage simulations, which clearly indicate that our proposal can be of crucial importance for the overall MANET scalability. Lastly, we compare our OFDM system with a recently proposed time-domain equalization singlecarrier system and point out use cases, where the OFDM system can be more advantageous.

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Reciprocity Calibration of TDD MIMO Channel for Interference Alignment

Zhao

Pottie

Daneshrad

2020

IEEE Trans. Wireless Commun.

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Experimental results for low overhead frequency offset estimation in MANETs with concurrent transmission

Cited by 3 publications

References 8 publications

SDR-based Demonstration System and Applicability of SNR Aggregation for Multistage Distributed Cooperative Communication in MANETs

SDR-based Demonstration System and Applicability of SNR Aggregation for Multistage Distributed Cooperative Communication in MANETs

Multi-Carrier (OFDM) Cooperative Transmission in MANETs with Multiple Carrier Frequency Offsets

Reciprocity Calibration of TDD MIMO Channel for Interference Alignment

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