All-optical Walsh-Hadamard code Generation using MZI

Samanta, Supriti; Maity, Goutam Kumar; Mukhopadhyay, Subhadipta

doi:10.1109/devic.2019.8783836

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…This means that the amount of data actually sent is greater than the actual information to be communicated. There are many kinds of ECCs for different circumstances, for example, the AN code, BCH code, Walsh–Hadamard code and so on [30–32]. However, for the de Bruijn code, due to its special properties, a sub‐string with a length greater than

n

contains additional information that allows the detection of errors without transmitting redundant data.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Timing and synchronisation for high‐loss free‐space quantum communication with Hybrid de Bruijn Codes

Zhang

Lowndes

et al. 2021

IET Quantum Communication

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Satellite‐based, long‐distance free‐space quantum key distribution has the potential to realise global quantum secure communication networks. Detecting faint quantum optical pulses sent from space requires highly accurate and robust classical timing systems to pick out signals from the noise and allow for reconciliation of sent and received key bits. For such high‐loss applications, a fault‐tolerant synchronisation signal coding and decoding scheme based on de Bruijn sequences is proposed. A representative synchronisation timing system was tested in laboratory conditions and it demonstrated high fault tolerance for the error‐correction algorithm even under high loss. The performance limitations of this solution are also discussed, and the maximum error tolerance of the scheme and the estimated computational overhead are analysed, allowing for the possibility of implementation on a real‐time system‐on‐chip. This solution not only can be used for synchronisation of high‐loss channels such as channels between satellites and ground stations but can also be extended to applications with low loss, high bit error rate, but require reliable synchronisation such as quantum and non‐quantum communications over terrestrial free space or fibre optic channels.

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n

contains additional information that allows the detection of errors without transmitting redundant data.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Timing and synchronisation for high‐loss free‐space quantum communication with Hybrid de Bruijn Codes

Zhang

Lowndes

et al. 2021

IET Quantum Communication

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show abstract

“…where ϕ l; p represents the binary phase encoded by Walsh-Hadamard codes [24,25] (a string of values 0 [þ1] and π [−1]) of length P l . Figure 3, for instance, shows a sequence of four distinct codes (denoted by C 1 , C 2 , C 3 and C 4 ) used to encode signals in group 0 in a time block (assuming four transmitters for group 0).…”

Section: Proposed Algorithm For Waveform Diversitymentioning

confidence: 99%

“…On the other hand, before transmitting, the signals within the l ‐th group are encoded by assigning binary phases in a time block of length

P_{l} T_{P}

. According to this description, transmitted signal

s_{l, p} (t)

can be written mathematically in the form:

s_{l, p} (t) = e^{j [2 π ((f_{0} - l f_{normalΔ}) t + 0.5 K t^{2}) - ϕ_{l, p}]}, 0 < t < P_{l} T_{P},

where

ϕ_{l, p}

represents the binary phase encoded by Walsh‐Hadamard codes [24, 25] (a string of values 0 [

+ 1

] and π [

- 1

]) of length P l . Figure 3, for instance, shows a sequence of four distinct codes (denoted by C 1 , C 2 , C 3 and C 4 ) used to encode signals in group 0 in a time block (assuming four transmitters for group 0).…”

Section: Proposed Algorithm For Waveform Diversitymentioning

confidence: 99%

An efficient waveform diversity based on variational mode decomposition of coded beat‐frequency shifted signals algorithm for multiple‐input multiple‐output millimetre‐wave imaging

Molaei

Yurduseven

Fusco

2021

IET Radar Sonar & Navi

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Waveforms used in multiple-input multiple-output (MIMO) systems must be considered in such a way that individual transceiver (T-R) pairs can be separated from the composite received signal. An algorithm called variational mode decomposition of coded beatfrequency shifted signals (VMD-CBFSS) is presented for waveform diversity. First, transmitters are divided into several groups. A small shift is applied to the carrier frequency of the transmitters of different groups. Also, signals within each group are encoded by assigning a binary phase in a time block. On the receiver side, by using a multiresolution analysis technique, the combined signal is decomposed into its main frequency components and then the composite signals of each group are decoded to retrieve each T-R pair. VMD-CBFSS provides an efficient solution in terms of overall transmitting time and sampling rate in addition to robustness against channel noise. Moreover, the algorithm is employed in a near-field MIMO millimetre-wave imaging system, and results are presented in the form of numerical simulations.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Hence, all of the Walsh functions and codes are orthogonal and are generated using the Hadamard matrix, a square matrix containing one row of all zeros and remaining with an equal number of zeros and ones [47]. Such codes are flexible enough to be concatenated with other codes, like for synchronized multiuser systems because of its orthogonal features [46,48].…”

Section: Proposed System Descriptionmentioning

confidence: 99%

On the Performance of Self-Concatenated Coding for Wireless Mobile Video Transmission Using DSTS-SP-Assisted Smart Antenna System

Minallah

Ahmed

Ijaz

et al. 2021

Wireless Communications and Mobile Computing

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In the current age of advanced technologies, there is an escalating demand for reliable wireless systems, catering to the high data rates of mobile multimedia applications. This article presents a novel approach to the concept of Self-Concatenated Convolutional Coding (SECCC) with Sphere Packing (SP) modulation via Differential Space-Time Spreading- (DSTS-) based smart antennas. The two transmitters provide transmit diversity which is capable of recuperating the signal from the effects of fading, even with a single receiving antenna. The proposed DSTS-SP SECCC scheme is probed for the Rayleigh fading channel. The SECCC structure is developed using the Recursive Systematic Convolutional (RSC) code with the aid of an interleaver. Interleaving generates randomness in exchange for extrinsic information between the constituent decoders. Iterative decoding is invoked at the receiving side to enhance the output performance by attaining fruitful convergence. The convergence behaviour of the proposed system is investigated using EXtrinsic Information Transfer (EXIT) curves. The performance of the proposed system is ascertained with the H.264 standard video codec. The perceived video quality of DSTS-SP SECCC is found to be significantly better than that of the DSTS-SP RSC. To be more precise, the proposed DSTS-SP SECCC system exhibits an E b / N 0 gain of 8 dB at the PSNR degradation point of 1 dB, relative to the equivalent rate DSTS-SP RSC. Similarly, an E b / N 0 gain of 10 dB exists for the DSTS-SP SECCC system at 1 dB degradation point when compared with the SECCC scheme dispensing with the DSTS-SP approach.

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All-optical Walsh-Hadamard code Generation using MZI

Cited by 12 publications

References 7 publications

Timing and synchronisation for high‐loss free‐space quantum communication with Hybrid de Bruijn Codes

Timing and synchronisation for high‐loss free‐space quantum communication with Hybrid de Bruijn Codes

An efficient waveform diversity based on variational mode decomposition of coded beat‐frequency shifted signals algorithm for multiple‐input multiple‐output millimetre‐wave imaging

On the Performance of Self-Concatenated Coding for Wireless Mobile Video Transmission Using DSTS-SP-Assisted Smart Antenna System

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