Modulation/microwave integrated digital wireless developments

Feher, K.; Mehdi, Haider

doi:10.1109/22.392946

Cited by 14 publications

(3 citation statements)

References 11 publications

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“…However, the most salient feature in terms of power amplifier performance is the method of modulation GMSK (Guassian Minimum Shift Keying). GMSK can be thought of as a type of digital FM in which information is encoded onto a constant envelope waveform in terms of it's phase transitions [3]. The power amplifier designs make use of the constant envelope nature of the modulation and are able to operate into compression.…”

Section: Design Methodologymentioning

confidence: 99%

GaAs MMIC power amplifiers for GMSK based GSM/DCS-1800 applications

Imbornone

Murphy

Carney

et al. 1996

26th European Microwave Conference, 1996

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The design and development of subscriber power amplifiers for GMSK based GSM (Global System Mobile) and DCS-1800 will be presented. This extremely high volume and price sensitive market dictates that state of the art electrical performance and manufacturability need to be considered as concurrent design goals. Nonlinear modeling using both harmonic balance and time domain techniques provided the optimal circuit topology and element values. These two-stage GaAs MESFET power amplifiers operate on a 6V supply which is pulsed with a 570uS burst and a 12.5% duty cycle. The GSM power amplifier provides 36dBm pulsed output power at 53% efficiency and an associated gain of 26dB over the 890-915 MHz frequency range. The DCS-1800 power amplifier provides 33dBm pulsed output power at 56% efficiency and an associated gain of 22dB over the 1710-1785 MElz frequency range. The amplifiers are packaged in a novel thermally efficient low cost plastic package and incorporate flexible high-Q off chip output matching. The inherent package size is 0.02cm3 as compared to greater than 1cm3 typical of conventional hybrid approaches and is believed to be the smallest size for an amplifier of this functionality and state of the art electrical performance.

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Section: Design Methodologymentioning

confidence: 99%

GaAs MMIC power amplifiers for GMSK based GSM/DCS-1800 applications

Imbornone

Murphy

Carney

et al. 1996

26th European Microwave Conference, 1996

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“…The information to be transmitted over the radio channel is supplied by the pattern generator feeding a 155-Mb/s differentially encoded nonreturn-to-zero pseudorandom bit sequence (NRZ PRBS) into a double-balanced mixer. This mixer generates the differentially coherent binary PSK (DBPSK) signal [24] on a 400-MHz subcarrier supplied from a synthesizer. The short pulses of the MLL are intensity modulated with the DBPSK signal and subsequently transmitted over 3-km DSF to be detected by a fast PD (NEL KEPD1310VPG).…”

Section: A Downlink Experiments With External Modulation Of the Mllmentioning

confidence: 99%

A mobile broad-band communication system based on mode-locked lasers

Helmolt

Kruger

Krüger

et al. 1997

IEEE Trans. Microwave Theory Techn.

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A concept is proposed for a pico-cellular network for broad-band mobile communication on a millimeter-wave basis. How microwave optical-signal-processing techniques based on mode-locked lasers (MLL's), optical modulators, and high-speed photo diodes (PD's) can advantageously be applied in the optical feeder lines of a pico-cellular network at 60 GHz is investigated. The external cavity MLL (at 81.25 GHz) used for the experiments showed an single-sideband (SSB) phase noise of 059 dBc/Hz at 100-Hz offset, when actively locked at 6.25 GHz. With the PD, and limited by the V -band mixer equipment, spectral harmonics up to 100 GHz could be detected. For the downlink configuration, a 400-MHz subcarrier is modulated with a 155-Mb/s data signal and upconverted to 62.9 GHz using an MLL and a fast PD. The upconverted sideband at 62.9 GHz was received with an optical power of 014.3-dBm at a bit-error-rate (BER) equal to 10 09 without any additional penalty due to transmitting the signal over 3 km of optical fiber. BER measurements at 155 Mb/s down to 10 011 were made. For the uplink, the digitally encoded RF signal is downconverted also by optical microwave signal processing. A 155-Mb/s data encoded 19.21-GHz signal is downconverted to 460 MHz using a mode-locked laser, an optical modulator, and a 600-MHz optical receiver front end. A receiver sensitivity of 024.5 dBm (BER equal to 10 09 ) is demonstrated with the microwave signal being transmitted over a 1-m radio link and 3 km of optical fiber.Index Terms-Fiber optics, mobile networks, optical communication, optical microwave, radio in the local loop.

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“…Indeed, cellular telephony, radio paging, cellular data, and even rudimentary cellular multimedia services have become commonplace and the demand for enhanced capabilities will continue to grow into the foreseeable future [6], [10], [13], [18], [20]. It is anticipated that in the not-so-distant future, mobile users will be able to access their data and other services such as electronic mail, video telephony, stock market news, map services, and electronic banking while on the move [13], [19], [20], [22].…”

Section: Introductionmentioning

confidence: 99%

Randomized initialization protocols for ad hoc networks

Nakano¹,

Olariu²

2000

IEEE Trans. Parallel Distrib. Syst.

104

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AbstractÐAd hoc networks are self-organizing entities that are deployed on demand in support of various events including collaborative computing, multimedia classroom, disaster-relief, search-and-rescue, interactive mission planning, and law enforcement operations. One of the fundamental tasks that have to be addressed when setting up an ad hoc network (AHN, for short) is initialization. This involves assigning each of the n stations in the AHN a distinct ID number (e.g., a local IP address) in the range from I to n. Our main contribution is to propose efficient randomized initialization protocols for AHNs. We begin by showing that if the number n of stations is known beforehand, an n-station, single-channel AHN can be initialized with probability exceeding I À I n , in en y n log n p time slots, regardless of whether the AHN has collision detection capability. We then go on to show that even if n is not known in advance, an n-station, single-channel AHN with collision detection can be initialized with probability exceeding I À I n , in IHn Q y n ln n p time slots. Using this protocol as a stepping stone, we then present an initialization protocol for the n-station, kchannel AHN with collision detection that terminates with probability exceeding I À I n , in IHn Qk y n ln n k q time slots. Finally, we look at the case where the collision detection capability is not present. Our first result in this direction is to show that the task of electing a leader in an n-station, single-channel AHN can be completed with probability exceeding I À I n , in fewer than IIXQUlog n P PXQW log n time slots. This leader election protocol allows us to design an initialization protocol for the n-station, single-channel AHN with no collision detection that terminates with probability exceeding I À I n , in fewer than SXTUn y n ln n p time slots, even if n is not known beforehand. We then discuss an initialization protocol for the n-station, k-channel AHN with no collision detection that terminates with probability exceeding I À I n , in fewer than SXTU n k y n ln n k q time slots, whenever k n log n Q .

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Modulation/microwave integrated digital wireless developments

Cited by 14 publications

References 11 publications

GaAs MMIC power amplifiers for GMSK based GSM/DCS-1800 applications

GaAs MMIC power amplifiers for GMSK based GSM/DCS-1800 applications

A mobile broad-band communication system based on mode-locked lasers

Randomized initialization protocols for ad hoc networks

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