Relations of Carrier and Side-Bands in Radio Transmission

Hartley, R. V. L.

doi:10.1109/jrproc.1923.219862

Cited by 20 publications

(4 citation statements)

References 2 publications

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“…In addition, the process of local oscillator (LO) leaking to the RF also creates self-mixing terms, which are indistinguishable at a radio-frequency (RF) port from DC terms generated at baseband [5,7]. These twodimensional DC impairment terms result in a deteriorated carrier suppression performance of the transmit signal as well as a reduction of the error vector magnitude (EVM) [2,6]. Mathematically this can be defined as:…”

Section: Origin Offset Suppression In a Transmittermentioning

confidence: 99%

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Softransceiver transmit origin offset compensation: Digital to the rescue of RF-CMOS

Waheed¹,

Kilpatrick²,

Sheets³

et al. 2010

Proceedings of 2010 IEEE International Symposium on Circuits and Systems

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Multi-mode, multi-band Softransceiver core allows seamless support for the second to the fourth generation of modern wireless standards. Targeting such a transceiver core becomes a stretch goal as one implementation needs to simultaneously meet the conflicting requirements for various standards. Such a goal is achieved by designing radio-frequency and baseband circuits such that various operational parameters can be tweaked using a standard-specific configuration file. This is aided by addition of quality calibration hardware and algorithms. However, the wireless performance needs to be guaranteed across varying temperatures and voltages. This is achieved using active compensation loops, which keep the transceiver parameters at their optimum levels during operation. This work describes a practical origin offset compensation scheme employed for the transmit (Tx) path, which allows for the specification compliant performance across temperature, voltage and process over the required power control range.

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Section: Origin Offset Suppression In a Transmittermentioning

confidence: 99%

“…[1,3]. In this paper, we'll focus on the mechanisms needed to maintain acceptable quality of a key transmit parameter namely origin offset suppression [6]. In the remainder of the paper, we'll describe the importance of origin-offset as key calibration metric and its impact on the key performance parameters [4].…”

Section: Introductionmentioning

confidence: 99%

Softransceiver transmit origin offset compensation: Digital to the rescue of RF-CMOS

Waheed¹,

Kilpatrick²,

Sheets³

et al. 2010

Proceedings of 2010 IEEE International Symposium on Circuits and Systems

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“…The "single-sideband, suppressed-carrier" type of telephone transmission, invented by John R. Carson,22 has long been used in the Bell System in carrier systems on wire circuits. 23 Since the advantages of single sideband in radio transmission have been described by Hartley,24 and in the radio transmitter by Heising," we shall only briefly review the benefits arising from its use.…”

Section: S' = S-gimentioning

confidence: 99%

The Receiving System for Long-Wave Trans-Atlantic Radio Telephony

1928

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Transmission considerations and practical limitationsindicate that in the lower frequency range, frequencies near 60 kc are best suited for transatlantic radio-telephone transmission. A radio receiving location in Maine gives a signal-to-noise ratio improvement over a New York location equivalent to increasing the power of the British transmitter about 50 times.Various types of receiving antennas are briefly discussed. The waveantenna is selected as being most suitable for long-wave radio telephony. The various factors affecting wave-antenna performance and methods for measuring the physical constants of wave-antennas are discussed in detail. Highfrequency ground conductivities determined from wave-antenna measurements are given. Combination of several antennas to form arrays is found to be a desirable means of decreasing interference. The use of a wave-antenna array in Maine decreases the received noise power by an additional 400 times. If the receiving were to be accomplished near New York using a loop antenna, we would have to increase the power of the British transmitting station 20,000 times to obtain the same signal-to-noise ratio. Comparisons of calculated and observed directional diagrams of wave-antennas and wave-antenna arrays are presented and discussed.The transmission considerations governing the design of a radio receiver for commercial telephone reception are outlined.Mathematical discussions of the wave-antenna, antenna arrays, qua-sitilt angle, and probability of simultaneous occurrence of telegraph interference are given in the appendices. E AARLY in October, 1915, engineers of the Bell System stationed in Paris heard the words "good-night Shreeve" which had been transmitted from Arlington. That date then marks the inception of transatlantic radio-telephone receiving. The progress which has been made in the radio-telephone receiving art since these first experiments is demonstrated by contrasting the homodyne receiver and the non-directional antenna then used with the present commercial receiving system employing double-demodulation of single side-band signals and an extensive array of wave-antennas forming a highly directional

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“…An important representative of classic cryptography is transposition ciphers, which rearrange the message to hide the original meanings. After the early 20th century, following the establishment of the information theory by Harry Nyquist, Ralph Hartley, and Claude Shannon [8][9][10][11][12][13], the study of cryptography started to exploit the tools of mathematics. Cryptography also became a branch of engineering, especially after the use of computers, which allows binary encryption of data.…”

Section: Introductionmentioning

confidence: 99%

An Overview of Geometrical Optics Restricted Quantum Key Distribution

Pan

Djordjević

2021

Entropy

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Quantum key distribution (QKD) assures the theoretical information security from the physical layer by safely distributing true random numbers to the communication parties as secret keys while assuming an omnipotent eavesdropper (Eve). In recent years, with the growing applications of QKD in realistic channels such as satellite-based free-space communications, certain conditions such as the unlimited power collection ability of Eve become too strict for security analysis. Thus, in this invited paper, we give a brief overview of the quantum key distribution with a geometrical optics restricted power collection ability of Eve with its potential applications.

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Relations of Carrier and Side-Bands in Radio Transmission

Cited by 20 publications

References 2 publications

Softransceiver transmit origin offset compensation: Digital to the rescue of RF-CMOS

Softransceiver transmit origin offset compensation: Digital to the rescue of RF-CMOS

The Receiving System for Long-Wave Trans-Atlantic Radio Telephony

An Overview of Geometrical Optics Restricted Quantum Key Distribution

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