On the Achievable Capacity of MIMO-OFDM Systems in the CathLab Environment

Guerreiro, João; Dinis, Rui; Campos, Luis Miguel

doi:10.3390/s20030938

Cited by 14 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let us consider Table 3, which shows the simulated the EVM values of the QDA considering a different number quantization bits and different constellations. From the analysis of those values, it can be noted that the prototype met the EVM value for 64-QAM constellations required for Wi-Fi applications 5 . Moreover, it can be observed that when M = 6 quantization bits are considered, the QDA can support even larger constellations.…”

Section: Evmmentioning

confidence: 91%

“…For instance, by combining a bandwidth of B = 80 MHz with 64-QAM constellations and a code rate 5/6, it is possible to achieve R = 360 Mbps [6]. Since the capacity gains provided by the use of MIMO in the Wi-Fi-based Cathlab applications might not be as high as expected by the theory due to correlations between MIMO antennas [5], an alternative to increase the data rates per SS might resort to the adoption of larger constellations (i.e., higher values of M ). However, this will increase even more the (already high) envelope fluctuations of the transmitted OFDM signals, as well as the sensitivity to hardware imperfections and nonlinear distortions, causing severe amplification issues.…”

Section: System Characterization a Cathlab Environmentmentioning

confidence: 99%

“…Devices that require low rate communications like fractional flow reserve (FFR) are not difficult to turn wireless. However, turning wireless devices like the IVUS that involve reliable very high data rates (from 300 Mbps to 1 Gbps) and low latency (less than 100 ms), together with demanding quality of service (QoS) parameter, can present a significant challenge [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Highly-Efficient Amplification Scheme for Wireless Communications in a CathLab Environment

Viegas¹,

Serra

Guerreiro

et al. 2021

IEEE Access

Self Cite

View full text Add to dashboard Cite

Wireless communication systems are being considered for medical applications to facilitate the doctors' operation and the quality of the medical procedures. A demonstrative example of this is the catheterization laboratory (Cathlab), where it is desirable to replace the existent wired connections by wireless alternatives. However, there are some challenging requirements that need to be fulfilled by the wireless link, especially for intra-vascular ultra-sound (IVUS) systems, since the images acquired by the catheter should be transmitted with very high data rate and low latency, together with the highest possible amplification efficiency, to increase the battery life. The communication requirements can be achieved with latest Wi-Fi standard IEEE 802.11ax (Wi-Fi 6). However, since Wi-Fi is based on orthogonal frequency division multiplexing (OFDM) waveforms, the transmitted signals present high envelope fluctuations, leading to amplification difficulties and low energy efficiency. In this paper, we present an innovative amplification scheme named quantized digital amplification (QDA). It is shown that the QDA allows a quasi-linear amplification of IEEE 802.11ax signals while maintaining a very high energy efficiency. To demonstrate this, we present a QDA prototype and a set of performance results regarding both the linearity of the transmitted signals and the energy efficiency.

show abstract

Section: Evmmentioning

confidence: 91%

Section: System Characterization a Cathlab Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Highly-Efficient Amplification Scheme for Wireless Communications in a CathLab Environment

Viegas¹,

Serra

Guerreiro

et al. 2021

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, as the increasing of information rate and transmission range, an LED-based VLC system encounters heavy traffic because of the extremely finite modulation bandwidth of LEDs and the divergence of light (He et al 2016b). However, multiinput multi-output (MIMO) technology has been generally studied in (Alqahtani et al 2019;Deng et al 2012;Guerreiro et al 2020;Saraereh et al 2019)during previous few years and applied to various wireless OFDM systems as it can improve the reliability and capacity of the systems. But there are still major issues like channel correlation, hardware impairments and implementations, modulation and interference management which need to be address for future based wireless systems (Lu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

2021

View full text Add to dashboard Cite

In this work, a full-duplex time and wavelength division multiplexing-passive optical network (TWDM-PON) system is analysed. Orthogonal frequency division multiplexing (OFDM) with m-quadrature amplitude modulation (m-QAM) is employed to improve the performance of TWDM-PON for downstream and upstream transmission. Simultaneously, multi-color (390-750 nm) laser diodes (LDs) are employed for visible light communication (VLC) using various VLC links to encourage the information rate of fiber/VLC optical network. A TWDM-PON utilizing 16-, 32-and 64-QAM OFDM with ten LDs based VLC system has been analysed for full-duplex multi-color VLC signals of the system. The impact of the LDs input current and high transmission rate in the proposed PON/VLC link has been investigated for m-QAM OFDM modulation. The results show that the 40/40 Gbps 16-, 32-and 64-QAM signals over ten 8000 m VLC links and a 50 km fiber link are successfully transmitted at the modulation input current of 9 mA under bit error rate (BER) of 3.8×10 -3 .Also, the proposed system employing 16-, 32-and 64-QAM signals over a 10 km fiber and ten 10 m VLC links provide the maximum transmission rate of 120, 100 and 80 Gbps respectively. Moreover, the measured error vector magnitudes (EVMs) and calculated BER values for 16-QAM downstream and upstream signals, are well below the required FEC limit than high-order modulation formats. Further, the numerical analysis of the proposed system reveals the superiority of the proposed fiber/VLC links.

show abstract

“…In a word, a modern radar is required to detect targets in the midst of high-power jamming. It is worth noticing that, recently, the orthogonal frequency division multiplexing (OFDM) technique has been introduced to the array signal processing [3][4][5], and the joint radar and communication system [6,7]. Considering the demands of the military, the ECCM technology of the OFDM radar is investigated in this paper.…”

Section: Introductionmentioning

confidence: 99%

ECCM Schemes against Deception Jamming Using OFDM Radar with Low Global PAPR

Wang

Zhang

Wang

et al. 2020

Sensors

View full text Add to dashboard Cite

In this paper, a type of effective electronic counter-countermeasures (ECCM) technique for suppressing the high-power deception jamming using an orthogonal frequency division multiplexing (OFDM) radar is proposed. Concerning the velocity deception jamming, the initial phases of the pulses transmitted in a coherent processing interval (CPI) are designed to minimize the jamming power within a specific range, forming a notch around the jamming in the Doppler spectrum. For the purpose of suppressing the range deception jamming and the joint range-velocity deception jamming, the phase codes of the subcarriers belonging to the OFDM pulses are optimized to minimize the jamming power, distributing some specific bands in the range and the range-velocity domain, respectively. According to Parseval's theorem, the phase encoding, acting as the coding manner of the OFDM subcarriers can ensure that the energy of each OFDM symbol stays the same. It is worth noticing that the phase codes of the OFDM subcarriers can influence the peak-to-average power ratio (PAPR). Thus, an optimization problem is formulated to optimize the phase codes of the subcarriers under the constraint of global PAPR, which can regulate the PAPRs of multiple OFDM symbols at the same time. The proposed problem is non-convex; therefore, it is a huge challenge to tackle. Then we present a method named by the phase-only alternating direction method multipliers (POADMM) to solve the aforementioned optimization problem. Some necessary simulation results are provided to demonstrate the effectiveness of the proposed radar signaling strategy 4 of 26 norm. In addition, arg{x} denotes the phase vector of x.|·|, {·} and {·} are the magnitude, real part, and image part of a complex-valued input. The operators ⊕ and ⊗ are the Hadamard operator and Kronecker product operator, respectively. Let I, 1, and 0 denote the identity matrix, matrix of 1 and zero matrix (their size is determined from the context). The operators, Diag(·) and diag(·), are, respectively, the diagonal matrices formed by the entries of the vector argument and the column vector containing the principal diagonal of the matrix argument. denotes the gradient operator and vec(·) represents the vectorization of an input matrix.

show abstract

On the Achievable Capacity of MIMO-OFDM Systems in the CathLab Environment

Cited by 14 publications

References 15 publications

A Novel Highly-Efficient Amplification Scheme for Wireless Communications in a CathLab Environment

A Novel Highly-Efficient Amplification Scheme for Wireless Communications in a CathLab Environment

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

ECCM Schemes against Deception Jamming Using OFDM Radar with Low Global PAPR

Contact Info

Product

Resources

About