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Cognitive Radios provide communication devices with the flexibility to adjust to varying network and channel conditions. For this to be fully realizable spectrum sensing and signal reception have to happen simultaneously and have to require as little power as necessary to function in handheld devices. This work argues for the need of flexible digital-front ends as indispensable building block, able...
Cognitive Radio requires the architecture of radio systems to combine reception and spectrum monitoring functionality efficiently. We propose a flexible digital front end that supports concurrent synchronization and sensing of high-throughput wireless standards. The chip is implemented in 65 nm CMOS technology resulting in a chip area of 6.4 mm2. Fine grain clock gating allows synchronization at 4...
This paper describes the implementation of a flexible Turbo and LDPC outer modem engine which is capable of supporting the WiFi(802.11n), WiMax(802.16e) and 3GPPLTE standard on the same hardware resources. The chip is implemented in a 65 nm CMOS technology and occupies 10.37 mm2. The decoder flexibility is offered by means of an application-specific instruction-set processor (ASIP), with full datapath...
Wireless communication standards are developed at an ever-increasing rate of pace, and significant amounts of effort is put into research for new communication methods and concepts. On the physical layer, such topics include MIMO, cooperative communication, and error control coding, whereas research on the medium access layer includes link control, network topology, and cognitive radio. At the same...
This paper describes the implementation of an energy-efficient digital SDR baseband platform. The multi processor system-on-chip (MPSOC) is implemented in 90nm CMOS technology and occupies 32mm2. It incorporates all digital signal processing required by the physical layer of the WiFi(802.11n), WiMax(802.16e), mobile TV and 3GPP-LTE standards. The heterogeneous architecture with hierarchical wake-up...
The continuously increasing number of communication standards to be supported in nomadic devices combined with the fast ramping design cost in deep submicron technologies claim for highly reusable and flexible programmable solutions. Software defined radio (SDR) aims at providing such solutions in radio baseband architectures. Great advances were recently booked in handset-targeted SDR, covering most...
Energy scalable architectures and circuits for SDRs are proposed, for both a reconfigurable RF front-end and a heterogeneous multiprocessor SoC in a baseband platform. A performance/energy manager dynamically exploits the energy scalability and the dynamics in application requirements and propagation environment, realizing low-power operation. For the transmitter, the energy-scalability is translated...
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