Multitone signalling system employing quenched resonators for use on noisy radio-teleprinter circuits

Robin, H.K.; Bayley, D. S.; Murray, Tavi; Ralphs, J.D.

doi:10.1049/piee.1963.0221

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…Tag Spotting is closely related to a classic research topic in communication theory, namely information transmission at low signal-to-noise ratios. The motivation of this research has varied from securing the transmitted data such as in the case of spread-spectrum communication [1] to protection against interference in the case of the widely used CDMA standard [2] and to achieving long-range transmission [3].…”

Section: Related Workmentioning

confidence: 99%

Tag Spotting at the Interference Range

Bălan¹,

Psounis²

2012

Preprint

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In wireless networks, the presence of interference among wireless links introduces dependencies among flows that do not share a single link or node. As a result, when designing a resource allocation scheme, be it a medium access scheduler or a flow rate controller, one needs to consider the interdependence among nodes within interference range of each other. Specifically, control plane information needs to reach nearby nodes which often lie outside the communication range, but within the interference range of a node of interest.But how can one communicate control plane information well beyond the existing communication range? To address this fundamental need we introduce tag spotting. Tag spotting refers to a communication system which allows reliable control data transmission at SNR values as low as 0 dB. It does this by employing a number of signal encoding techniques including adding redundancy to multitone modulation, shaping the spectrum to reduce inter-carrier interference, and the use of algebraic coding. Making use of a detection theory-based model we analyze the performance achievable by our modulation as well as the trade-off between the rate of the information transmitted and the likelihood of error. Using real-world experiments on an OFDM system built with software radios, we show that we can transmit data at the target SNR value of 0 dB with a 6% overhead; that is, 6% of our packet is used for our low-SNR decodable tags (which carry up to a couple of bytes of data in our testbed), while the remaining 94% is used for traditional header and payload data. We also demonstrate via simulations how tag spotting can be used in implementing fair and efficient rate control and scheduling schemes in the context of wireless multi-hop networks, while pointing out that the idea of tag spotting is useful in the context of any wireless network in which control-plane information must travel beyond the communication range of a node.

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Section: Related Workmentioning

confidence: 99%

Tag Spotting at the Interference Range

Bălan¹,

Psounis²

2012

Preprint

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“…to obtain an output of 89 kHz, the 9th harmonic of 1 kHz is mixed in modulator A with the 8th harmonic of 10 kHz and the sum and difference components of 89 kHz and 71 kHz are 18 kHz apart. On the other hand, when the second digit of a 2-figure combination is 1, 2, 3 or 4, the complement is selected (9,8,7 or 6, respectively) and 1 is added to the first digit. Consider a required output of 82 kHz.…”

Section: Direct Frequency Synthesis Using Continuously Variable Filtersmentioning

confidence: 99%

Techniques of frequency synthesis

Stokes¹

1973

Proc. Inst. Electr. Eng. UK

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A brief outline of the initial development of synthetiser techniques is followed by a description of two early types, and reference is given to a comprehensive survey in the late 1960s. The concurrent advance in solid-state technology has had a major impact on synthetiser development, mainly in regard to divider-and voltage-controlledoscillator techniques, resulting in improved performance combined with reductions in size, weight, power consumption and cost. For economic viability, synthetisers must be designed for specific systems, and a section is devoted to the requirements for several systems. To meet such requirements, descriptions are given of the techniques used in a number of synthetisers, both variable -divider/voltage-controlled oscillator types and others. Although mainly in the h.f. band, examples are also given in the audio, v.h.f. and u.h.f. bands. Economic aspects are considered in regard to relative performance and to equipment replaced by synthetisers. As all synthetiser output frequencies are derived from a single master source, the reliability of this oscillator is of paramount importance. Finally, it is noted that miniaturisation has tended to reduce v.c.o. output to a level which makes noise-performance requirements difficult to achieve.

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“…One of the first systems to use a 32-ary orthogonal tone MFSK was the Piccolo system, [1], [2], developed for diplomatic communication by the British Foreign & Commonwealth Office in 1962. A key advantage of MFSK is the ability to carry out non-coherent reception as shown in [3]- [5] (and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…In a non-coherent orthogonal MFSK system, the tones need to be separated by the symbol rate, , and thus the total bandwidth (see [4], Chapter 5). Hence, the spectral efficiency, , which is the ratio of the bit rate, , to the total bandwidth, , is given by (1). (1) For integer , and for (i.e., single tone MFSK), this equation has a maximum at with .…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Non Orthogonal MFSK

Das

Rao

2014

IEEE Trans. Signal Process.

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M-ary frequency shift keying (MFSK) using one or more orthogonal tones per symbol has been in use in non-coherent systems for quite some time. We present an alternate system for non-coherent systems using non-orthogonal tones, spread non-uniformly throughout the bandwidth, which outperforms the equivalent orthogonal tone system. We demonstrate that from a theoretical capacity point of view, the same bit rate could be achieved by the proposed system with as much as 2.5 dB lower signal-to-noise ratio (SNR). For some practical configurations we demonstrate as much as 2 dB of gain. We present the performance with maximumlikelihood (ML) receivers as well as least-squares (LS) receivers as well as lower complexity receivers based on compressed sensing (CS). We also demonstrate that such a non-orthogonal system may be used to increase the spectral efficiency of the overall system by adapting the spectral efficiency in response to the link SNR. Such an adaptive non-orthogonal MFSK system requires estimation of the SNR (or ), and we present both the Cramér-Rao lower bound (CRLB) as well as maximum-likelihood (ML) estimators, which attain the CRLB for both data-aided (DA) SNR estimation as well as non-data-aided (NDA) SNR estimation.

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Multitone signalling system employing quenched resonators for use on noisy radio-teleprinter circuits

Cited by 7 publications

References 10 publications

Tag Spotting at the Interference Range

Tag Spotting at the Interference Range

Techniques of frequency synthesis

Adaptive Non Orthogonal MFSK

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