Predicting the Compatibility of High Frequency Sky-Wave Communication Systems

Sailors, D. B.; Kugel, Carl P.; Haydon, George W.

doi:10.1109/temc.1977.303606

Cited by 5 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus the S/I ratio is actually a very complex probability distribution. Although various attempts [Freeman and Sachs, 1975] [Sailors et al, 1977] have been made to develop approximations of the S/I distributions, very little if any practical use has been made of these models. The problem to date is that the experiments have been made with oversimplifying assumptions, and the mathematical solutions have insufficient data to make the equations useful.…”

Section: Paper Number 97rs00843mentioning

confidence: 99%

Required signal‐to‐interference ratios for shortwave broadcasting

Lane¹

1997

Radio Science

View full text Add to dashboard Cite

Abstract. The required signal-to-Imerference (RSI) ratio for a specified grade of HF radio service is the hourly median warned signal power at the input of the receiver needed relative to the sum of the hourly median unwanted signal power and the hourly median radio noise power in the RF bandwidth of the receiver, adjusted so that the hourly median ratio will not fall below the RSI ratio more than a certain percentage of the time due to minute-to-minute fading within the hour. Shortwave listeners are well aware of the deleterious effects of cochannel and adjacem channel imerference. This type of interference is especially prevalent in the overcrowded international broadcast bands where it is manifested by cross talk and a beat note produced in the receiver by the carrier of the unwanted signal. Yet little agreemere exists as to the magnitude of the amplitudemodulated, double sideband (AM-DSB) interfering signal that can be tolerated by the listener. Numerous protection ratios have been proposed in the literature, as well as by elemems of the International Telecommunication Union. These values tend to range from 17 dB [International Frequency Registration Board, 1989] to as high as 50 dB for "good commercial quality, " offset in carrier frequency of 500 Hz and 10 dB short-term fade protection [CCIR, 1970]. In this paper, several significam experiments are reviewed for the purpose of normalizing their findings to a common set of parameters. The parameters relate to articulation scoring, type of noise (if used), fading of warned and unwanted signals, type of interference, listener skill, bandwidth of the receiver, carrier frequency offset, etc. From this compilation of normalized data, RSI values are recommended as they relate to the desired broadcast quality and the signal-to-noise ratio of the warned signal. The RSI ratios are compatible for use in HF sky wave prediction programs that comain appropriate RF noise and imerference combining subroutines. The recommended minimum acceptable for cochannel imerference is 36 dB, in order to maimain a fair grade of service where voice reception is understandable but with difficulty for at least 90 % of the hour. In order to provide good service ( i.e., the interference is perceived not to be annoying) to 90% of the listeners, the RSI should be 48 dB. The RSI needed for "no perceptible" interference is 53 dB.

show abstract

Section: Paper Number 97rs00843mentioning

confidence: 99%

Required signal‐to‐interference ratios for shortwave broadcasting

Lane¹

1997

Radio Science

View full text Add to dashboard Cite

show abstract

“…Measures of this performance are signal-to-interference protection ratios (S/I), signal-tonoise ratios (S/N), and minimum field strengths. These performance measures are statistical quantities and techniques to model them for spectrum compatibility purposes at HF have been accomplished [8]. These methods as yet have not been specifically applied to broadcasting signals.…”

Section: Hf Broadcasting Conferencementioning

confidence: 99%

Spectrum Management of the HF Broadcasting Service after WARC-79

Cohen

Rush

1981

IEEE Trans. Electromagn. Compat.

View full text Add to dashboard Cite

The 1979 World Administrative Radio Conference (WARC-79) allocated additional spectrum for HF broadcasting with the view toward relieving the congestion in the bands allocated to HF broadcasting. This paper describes, in detail, the WARC-79 allocation changes for the HF Broadcasting Service and presents a description of present and past methods which have been applied to the spectrum management of the HF Broadcasting Service. The WARC-79 also recommended that a specialized WARC be held to plan the HF bands allocated to the Broadcasting Service. This WARC has been scheduled to begin in January 1984 and the technical issues relating to this conference are presented here.

show abstract

Preliminary Technical Assessment of the Feasibility of Frequency Sharing by Fixed and Mobile Users in the 4-28 MHz Frequency Range

Sailors¹,

Brown²

1978

1978 IEEE International Symposium on Electromagnetic Compatibility

View full text Add to dashboard Cite

Predicting the Compatibility of High Frequency Sky-Wave Communication Systems

Cited by 5 publications

References 14 publications

Required signal‐to‐interference ratios for shortwave broadcasting

Required signal‐to‐interference ratios for shortwave broadcasting

Spectrum Management of the HF Broadcasting Service after WARC-79

Preliminary Technical Assessment of the Feasibility of Frequency Sharing by Fixed and Mobile Users in the 4-28 MHz Frequency Range

Contact Info

Product

Resources

About