References of "Ottersten, Björn"
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See detailRate Splitting Multiple Access for Cognitive Radio GEO-LEO Co-Existing Satellite Networks
Khan, Wali Ullah UL; Ali, Zain; Lagunas, Eva et al

Scientific Conference (2022, December 07)

Low Earth orbit (LEO) satellite communication has drawn particular attention recently due to its high data rate services and low round-trip latency. It is low-cost to launch and can provide global ... [more ▼]

Low Earth orbit (LEO) satellite communication has drawn particular attention recently due to its high data rate services and low round-trip latency. It is low-cost to launch and can provide global coverage. However, the spectrum scarcity might be one of the critical challenges in the growth of LEO satellites, impacting severe restrictions on the development of ground-space integrated networks. To address this issue, we propose rate splitting multiple access (RSMA) for cognitive radio (CR) enabled nongeostationary orbit (GEO)-LEO coexisting satellite network. In particular, this work aims to maximize the system's sum rate by simultaneously optimizing the power allocation and subcarrier beam assignment of LEO satellite communication while restricting the interference temperature to GEO satellite users. The problem of sum rate maximization is formulated as non-convex and a Global optimal solution is challenging to obtain. Therefore, we first employ the successive convex approximation technique to reduce the complexity and make the problem more tractable. Then for the power allocation, we exploit Karush–Kuhn–Tucker (KKT) condition and adopt an efficient algorithm based on the greedy approach for subcarrier beam assignment. We also propose two suboptimal schemes with fixed power allocation and random subcarrier beam assignment. [less ▲]

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See detailOrthorectified Polar Format Algorithm for Generalized Spotlight SAR Imaging With DEM
Hu, Ruizhi UL; Rao, Bhavani Shankar Mysore Rama; Alaee-Kerahroodi, Mohammad et al

in IEEE Transactions on Geoscience and Remote Sensing (2021)

Detailed reference viewed: 91 (20 UL)
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See detailWidely-distributed Radar Imaging Based on Consensus ADMM
Hu, Ruizhi UL; Rao, Bhavani Shankar Mysore Rama; Murtada, Ahmed et al

Scientific Conference (2021)

Detailed reference viewed: 68 (27 UL)
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See detailAdaptive Waveform Design for Automotive Joint Radar-communications System
Dokhanchi, Sayed Hossein UL; Shankar, M. R. Bhavani; Alaee-Kerahroodi, Mohammad UL et al

in ICASSP 2019-2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2019)

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See detailMeeting the Lower Bound on Designing Set of Unimodular Sequences with Small Aperiodic/Periodic ISL
Alaee-Kerahroodi, Mohammad UL; Shankar, Bhavani; Mishra, Kumar Vijay et al

in 2019 20th International Radar Symposium (IRS) (2019)

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See detailDesigning (In) finite-alphabet Sequences via Shaping the Radar Ambiguity Function
Alaee-Kerahroodi, Mohammad UL; Sedighi, Saeid UL; MR, Bhavani Shankar et al

in ICASSP 2019-2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2019)

In this paper, a new framework for designing the radar transmit waveform is established through shaping the radar Ambiguity Function (AF). Specifically, the AF of the phase coded waveforms are analyzed ... [more ▼]

In this paper, a new framework for designing the radar transmit waveform is established through shaping the radar Ambiguity Function (AF). Specifically, the AF of the phase coded waveforms are analyzed and it is shown that a continuous/discrete phase sequence with the desired AF can be obtained by solving an optimization problem promoting equality between the AF of the transmit sequence and the desired AF. An iterative algorithm based on Coordinate Descent (CD) method is introduced to deal with the resulting non-convex optimization problem. Numerical results illustrate the proposed algorithm make it possible to design sequences with remarkably high tolerance towards Doppler frequency shifts, which is of interest to the future generations of automotive radar sensors. [less ▲]

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See detailDesigning (In) finite-alphabet Sequences via Shaping the Radar Ambiguity Function
Alaee-Kerahroodi, Mohammad UL; Sedighi, Saeid UL; MR, Bhavani Shankar et al

in ICASSP 2019-2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2019)

In this paper, a new framework for designing the radar transmit waveform is established through shaping the radar Ambiguity Function (AF). Specifically, the AF of the phase coded waveforms are analyzed ... [more ▼]

In this paper, a new framework for designing the radar transmit waveform is established through shaping the radar Ambiguity Function (AF). Specifically, the AF of the phase coded waveforms are analyzed and it is shown that a continuous/discrete phase sequence with the desired AF can be obtained by solving an optimization problem promoting equality between the AF of the transmit sequence and the desired AF. An iterative algorithm based on Coordinate Descent (CD) method is introduced to deal with the resulting non-convex optimization problem. Numerical results illustrate the proposed algorithm make it possible to design sequences with remarkably high tolerance towards Doppler frequency shifts, which is of interest to the future generations of automotive radar sensors. [less ▲]

Detailed reference viewed: 100 (27 UL)
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See detailDesigning (In) finite-alphabet Sequences via Shaping the Radar Ambiguity Function
Alaee-Kerahroodi, Mohammad UL; Sedighi, Saeid UL; MR, Bhavani Shankar et al

in ICASSP 2019-2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (2019)

In this paper, a new framework for designing the radar transmit waveform is established through shaping the radar Ambiguity Function (AF). Specifically, the AF of the phase coded waveforms are analyzed ... [more ▼]

In this paper, a new framework for designing the radar transmit waveform is established through shaping the radar Ambiguity Function (AF). Specifically, the AF of the phase coded waveforms are analyzed and it is shown that a continuous/discrete phase sequence with the desired AF can be obtained by solving an optimization problem promoting equality between the AF of the transmit sequence and the desired AF. An iterative algorithm based on Coordinate Descent (CD) method is introduced to deal with the resulting non-convex optimization problem. Numerical results illustrate the proposed algorithm make it possible to design sequences with remarkably high tolerance towards Doppler frequency shifts, which is of interest to the future generations of automotive radar sensors. [less ▲]

Detailed reference viewed: 100 (27 UL)
See detailDiscrete-Phase Sequence Design for Coexistence of MIMO Radar and MIMO Communications
Alaee-Kerahroodi, Mohammad UL; Mishra, Kumar Vijay; Shankar, M. R. Bhavani et al

in 2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) (2019)

Detailed reference viewed: 93 (5 UL)