A 8.75-MBaud single-chip digital QAM modulator with frequency-agility and beamforming diversity

Cho, K.-H.; Samueli, H.

doi:10.1109/cicc.2000.852611

Cited by 13 publications

(11 citation statements)

References 4 publications

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“…This is indeed practically feasible, and appropriate hardware architectures have been developed [Cho and Samueli 2000]. Originally, these architectures were used for a different purpose, namely adapting the modulation to maximize the system throughput [Balachandran et al 1999;Ue et al 1998;Webb and Steele 1995].…”

Section: Related Workmentioning

confidence: 99%

“…The main benefits from modulation scaling are due to f (b). The power consumption of the electronic circuitry, which is largely analog, P E , can be written as (7) [Cho and Samueli 2000;Schurgers et al 2001a]. C E is a constant that depends on the radio architecture, the circuit implementation, and the semiconductor technology.…”

Section: Energy and Delay Breakdownmentioning

confidence: 99%

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Power management for energy-aware communication systems

Schurgers

Raghunathan

Srivastava

2003

ACM Trans. Embed. Comput. Syst.

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System-level power management has become a key technique to render modern wireless communication devices economically viable. Despite their relatively large impact on the system energy consumption, power management for radios has been limited to shutdown-based schemes, while processors have benefited from superior techniques based on dynamic voltage scaling (DVS). However, similar scaling approaches that trade-off energy versus performance are also available for radios. To utilize these in radio power management, existing packet scheduling policies have to be thoroughly rethought to make them energy-aware, essentially opening a whole new set of challenges the same way the introduction of DVS did to CPU task scheduling. We use one specific scaling technique, dynamic modulation scaling (DMS), as a vehicle to outline these challenges, and to introduce the intricacies caused by the nonpreemptive nature of packet scheduling and the time-varying wireless channel.

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Section: Related Workmentioning

confidence: 99%

Section: Energy and Delay Breakdownmentioning

confidence: 99%

Power management for energy-aware communication systems

Schurgers

Raghunathan

Srivastava

2003

ACM Trans. Embed. Comput. Syst.

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“…contributes as well. Equation (7) expresses this component P E for a system that can dynamically change the symbol rate [8]. Parts of the circuitry operate at a frequency that follows the instantaneous symbol rate, while other parts have a fixed frequency proportional to the maximum symbol rate.…”

Section: Communication Theorymentioning

confidence: 99%

“…The values of C S , C E and C R are extracted from [8], which describes the actual implementation of an adaptive QAM system. Note that the results of figure 1 are for a communication system that has provisions to vary the symbol rate on the fly.…”

Section: Performance Tradeoffsmentioning

confidence: 99%

Modulation scaling for Energy Aware Communication Systems

Schurgers

Aberthorne

Srivastava

2001

Proceedings of the 2001 International Symposium on Low Power Electronics and Design - ISLPED '01

201

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In systems that require low energy consumption, voltage scaling is an invaluable circuit technique. It also offers energy awareness, trading off energy and performance. In wireless handheld devices, the communication portion of the system is a major power hog. We introduce a new technique, called modulation scaling, which exhibits benefits similar to those of voltage scaling. It allows us to trade off energy against transmission delay and as such introduces the notion of energy awareness in communications. Throughout our discussion, we emphasize the analogy with voltage scaling. As an example application, we present an energy aware wireless packet scheduling system.

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“…The circuit power consumption remains fixedly even when the baseband module is in idle state. The circuit power consumption of RAT can be given by [13]:…”

Section: Figure 1 System Modelmentioning

confidence: 99%