| Autor: |
Diksha Thakur, Vikas Baghel, Salman Raju Talluri |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Measurement: Sensors, Vol 24, Iss , Pp 100514- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2665-9174 |
| DOI: |
10.1016/j.measen.2022.100514 |
| Popis: |
A new adaptive beamforming algorithm is developed not only to provide distortionless responses towards the two desired signals in the presence of interferences and noise but also to control the sidelobe level (SLL). The conventional standard Capon beamformer (SCB) deals with only one desired signal at a time and also offers much high SLL which can enhance unanticipated interferences. So, the conventional SCB is modified for incorporating two signals of interest (SOI) and a limited number of constraints are introduced for suppressing the SLL. Unity gain is maintained towards the second desired signal by employing an additional constraint in the conventional SCB. To control the SLL, a limited number of angles are sampled in the sidelobe region and the powers that correspond to these sampled angles are constrained to a specified level. The sampled angles are chosen from the particular sidelobe regions around the main beams and an empirical formula is given for determining the number of constraints. The resulting optimization problem is convex and solved by the CVX solver of Matlab to obtain the optimum weight vector. Finally, simulations are performed for various scenarios to evaluate the performance of the proposed algorithm. Simulation results illustrate that the proposed algorithm can receive two desired signals simultaneously and also becomes less vulnerable to unpredicted interferences in the vicinity of main beams as the SLL is minimized. The proposed algorithm achieves the maximum improvements of 20 dB and 16 dB in the SLL for two different scenarios as compared to the conventional algorithm. Moreover, the proposed algorithm preserves the SINR as that of SCB dual beam algorithm. In addition, the proposed algorithm can be used in medical imaging to resolve dual targets using two beams. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
