Multiband and Multibeam Direction of Arrival Estimation Using On-Site Coding Digital Beamformer

Venkatakrishnan, Satheesh Bojja; Akhiyat, Abe; Alwan, Elias A.; Volakis, John L.

doi:10.1109/lawp.2017.2717785

Cited by 10 publications

(8 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the above synchronization scheme, bit error rate (BER) and SNR was simulated. Based on the results in [9,10,15], it can be concluded that above synchronization scheme results in no performance degradation.…”

Section: Clock Synchronization Implementationmentioning

confidence: 94%

“…Using the above synchronization topology, OSCR performance was measured and it was found that there is no overall degradation in OSCR performance due to synchronization issues, as detailed in [9,10,15]. Using the above synchronization scheme, bit error rate (BER) and SNR was simulated.…”

Section: Clock Synchronization Implementationmentioning

confidence: 99%

“…Hence, this architecture is not suited for OSCR, since the drawbacks outweigh its low jitter performance. Figure 7, various multibeam and multifrequency measurements are performed in the anechoic chamber using the constructed 8 channels [9,15]. For the measurement, 8 RF boards were used as receivers and an encoder board was employed for performing on-site coding.…”

Section: Clock Synchronization Using External Distribution Circuitmentioning

confidence: 99%

See 2 more Smart Citations

Challenges in Clock Synchronization for On-Site Coding Digital Beamformer

Venkatakrishnan

Alwan

Volakis

2017

International Journal of Reconfigurable Computing

Self Cite

View full text Add to dashboard Cite

Typical radio frequency (RF) digital beamformers can be highly complex. In addition to a suitable antenna array, they require numerous receiver chains, demodulators, data converter arrays, and digital signal processors. To recover and reconstruct the received signal, synchronization is required since the analog-to-digital converters (ADCs), digital-to-analog converters (DACs), field programmable gate arrays (FPGAs), and local oscillators are all clocked at different frequencies. In this article, we present a clock synchronization topology for a multichannel on-site coding receiver (OSCR) using the FPGA as a master clock to drive all RF blocks. This approach reduces synchronization errors by a factor of 8, when compared to conventional digital beamformer.

show abstract

Section: Clock Synchronization Implementationmentioning

confidence: 94%

Section: Clock Synchronization Implementationmentioning

confidence: 99%

Section: Clock Synchronization Using External Distribution Circuitmentioning

confidence: 99%

See 1 more Smart Citation

Challenges in Clock Synchronization for On-Site Coding Digital Beamformer

Venkatakrishnan

Alwan

Volakis

2017

International Journal of Reconfigurable Computing

Self Cite

View full text Add to dashboard Cite

show abstract

“…The OS-CDM has already been demonstrated (fabricated and tested) in [6], [7], [12], [13], showing an unprecedented factor of 8-fold hardware reduction in ADC count with corresponding reduction in power consumption. Also, it has been validated experimentally across 0.5-5 GHz.…”

Section: Os-cdm Hardware Fabrication and Testingmentioning

confidence: 99%

“…Also, it has been validated experimentally across 0.5-5 GHz. The backend electronics for the OS-CDM concept have also been fabricated and tested at low frequencies for 8 signal paths [6], [12], [13]. As illustrated in Fig.…”

Section: Os-cdm Hardware Fabrication and Testingmentioning

confidence: 99%

Low Power and Reduced Hardware UWB Beamformers for Future 5G Communications

Volakis

Hokayem

Venkatakrishnan

et al. 2019

IEICE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

We present a novel hybrid beamforming architecture for high speed 5G technologies. The architecture combines several new concepts to achieve significant hardware and cost reduction for large antenna arrays. Specifically, we employ an on-site code division multiplexing scheme to group several antenna elements into a single analog-to-digital converter (ADC). This approach significantly reduces analog hardware and power requirements by a factor of 8 to 32. Additionally, we employ a novel analog frequency independent beamforming scheme to eliminate phase shifters altogether and allow for coherent combining at the analog front-end. This approach avoids traditional phase-shifter-based approaches typically associated with bulky and inefficient components. Preliminary analysis shows that for an array of 800 elements, as much as 97% reduction in cost and power is achieved using the hybrid beamformer as compared to conventional beamformer systems.

show abstract

Fundamental/harmonics beam control using 1-bit space time-modulated plasma DMA

2023

View full text Add to dashboard Cite

This paper investigates a space-time modulated digital metamaterial array (DMA) based on reconfigurable plasma ionization. The DMA consists of 8 × 8 unit-cell elements with total dimensions of 120 × 120 × 3.2 mm3. Each unit-cell consists of a ring container filled with argon gas and is backed with a grounded dielectric substrate. The argon gas is ionized into a plasma state through metallic electrodes. The logic state of the unit cell is controlled via the changing of the plasma frequency, $${\omega }_{p}.$$ ω p . The value of $${\omega }_{p}=6\times {10}^{11}\mathrm{ rad}/\mathrm{sec}$$ ω p = 6 × 10 11 rad / sec represents logic “0”, and $${\omega }_{p}=8\times {10}^{11} \mathrm{rad}/\mathrm{sec}$$ ω p = 8 × 10 11 rad / sec represents logic “bit 1”. The periodic time switching of the plasma ionization controls the radiation at the fundamental and harmonic frequencies. The on-time instants and on-time durations control the number of radiated beams, their directions, amplitudes, and side-lobe levels. Different time-switching sequences are investigated for beam steering, dual-sum beams, broadside beams, end-fire beams, multi-beams, and fan-shaped beams for wireless communications applications. The DMA was investigated under different switching sequences for phase-modulation and amplitude-modulation schemes. A full-wave simulation CST Microwave Studio simulator is used to analyze the proposed DMA and the results are compared with ideal point sources array excited with the same switching sequences.

show abstract

Multiband and Multibeam Direction of Arrival Estimation Using On-Site Coding Digital Beamformer

Cited by 10 publications

References 16 publications

Challenges in Clock Synchronization for On-Site Coding Digital Beamformer

Challenges in Clock Synchronization for On-Site Coding Digital Beamformer

Low Power and Reduced Hardware UWB Beamformers for Future 5G Communications

Fundamental/harmonics beam control using 1-bit space time-modulated plasma DMA

Contact Info

Product

Resources

About