Detection of antipodal signalling and its application to wideband SETI

Morrison, Ian S.

doi:10.1016/j.actaastro.2011.10.007

Cited by 7 publications

(14 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The search for wideband signals is much more challenging than the search for narrowband signals; on the other hand, a wideband beacon can carry vastly more information than a narrowband beacon. For more information on wideband SETI see, for example, papers by Benford, Benford and Benford (2010a, b); Harp et al (2011);Messerschmitt (2012); Morrison (2012).…”

Section: They Are Signaling But We Don't Know At Which Frequency To Lmentioning

confidence: 99%

If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?

Webb

2015

Science and Fiction

View full text Add to dashboard Cite

Section: They Are Signaling But We Don't Know At Which Frequency To Lmentioning

confidence: 99%

If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?

Webb

2015

Science and Fiction

View full text Add to dashboard Cite

“…Thus, the MF can be used for discovery based on single-symbol energy, the approach used here. If more assumptions are made about the symbol constellation and any redundancy in successive symbols, then the approaches here can be modified to base discovery on multiple symbols, thereby capturing more signal energy (see [3] for an example).…”

Section: Detection In Noisementioning

confidence: 99%

“…This is rendered more challenging by the impossibility of advance coordination between transmitter and receiver, and discovery is the more challenging problem and also represents the dominant cost and effort for a receiving civilization. Although this paper addresses both discovery and communication from an end-to-end perspective, past efforts have addressed transmission and reception as primarily separate issues, and in the case of the receiver (with the exception of [2,3]) have focused on discovery of signals designed to attract attention but not bear information. Some entryways into the extensive literature on this topic can be found in [4,5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…where it is assumed that h(t) is simultaneously bandlimited to f ∈ [0, B] Hz (so the passband representation is bandlimited to| f | ∈ [ f c , f c + B]) and time-limited to t ∈ [0, T] seconds 3. This RFI term corrupting the decision can be small or large in magnitude depending on how r(·) correlates3 This arbitrary choice of f c (so that the baseband signal has a one-sided spectrum) emphasizes that h(t) is complexvalued. The ideal of simultaneous time and bandwidth limitation can be achieved with increasing accuracy[40] as K = BT → ∞.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Interstellar communication: The case for spread spectrum

Messerschmitt

2012

Acta Astronautica

View full text Add to dashboard Cite

Spread spectrum, widely employed in modern digital wireless terrestrial radio systems, chooses a signal with a noise-like character and much higher bandwidth than necessary. This paper advocates spread spectrum modulation for interstellar communication, motivated by robust immunity to radio-frequency interference (RFI) of technological origin in the vicinity of the receiver while preserving full detection sensitivity in the presence of natural sources of noise. Receiver design for noise immunity alone provides no basis for choosing a signal with any specific character, therefore failing to reduce ambiguity. By adding RFI to noise immunity as a design objective, the conjunction of choice of signal (by the transmitter) together with optimum detection for noise immunity (in the receiver) leads through simple probabilistic argument to the conclusion that the signal should possess the statistical properties of a burst of white noise, and also have a large time-bandwidth product. Thus spread spectrum also provides an implicit coordination between transmitter and receiver by reducing the ambiguity as to the signal character. This strategy requires the receiver to guess the specific noise-like signal, and it is contended that this is feasible if an appropriate pseudorandom signal is generated algorithmically. For example, conceptually simple algorithms like the binary expansion of common irrational numbers like π are shown to be suitable. Due to its deliberately wider bandwidth, spread spectrum is more susceptible to dispersion and distortion in propagation through the interstellar medium, desirably reducing ambiguity in parameters like bandwidth and carrier frequency. This suggests a promising new direction in interstellar communication using spread spectrum modulation techniques.

show abstract

“…This is a normal mode on earth, where there is also the luxury of transmitter-receiver coordination. In light of this, we believe it appropriate to explore the possibility of an information-bearing signal that is also relatively easy to discover [22,23,19]. We cite early examples in Section 4.6.…”

Section: Trading Transmitter and Receiver Resourcesmentioning

confidence: 99%