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Chipsets for WiMAX Devices
Published in Amitabh Kumar, Mobile Broadcasting with WiMAX: Principles, Technology, and Applications, 2014
Some of the features of RNA200 are: IEEE 802.16e air interface physical layer specifications compliant.High throughput: 56 Mbps for 14 MHz channel.On-chip modulation and demodulation, for substantial cost savings, and short time to market.IEEE 802.16e air interface MAC layer specifications compliant.High-spectral efficiency up to 4 Bps/Hz.Uses 2 K, 1 K, and 512 FFT sizes for broadband downstream/upstream transmission.Automatic power adjustment to meet variable transmission conditions.Adaptive modulation for upstream and downstream: QPSK, 16 QAM, and 64 QAM.Uses advanced turbo coding FEC to achieve low BER.Includes analogue base-band I/Q as direct interface to RFIC module.Includes 10-bit A/D, 10-bit D/A, and PLL cores.Includes USB, CF, card bus, UART, host port, SDIO, and USIM interfaces.Includes VoIP core.Includes STC and open loop MIMO (future releases) capabilities.High throughput: 80 Mbps for 20 MHz channel.Increases coverage and immunity in adverse multipath environment.Supports dynamic bandwidth allocation techniques.Complete design kit enables fast evaluation, development, and compliance testing.Supports antenna diversity and smart antenna techniques (optional).Supports space time coding (optional).
Optimal resource allocation for stochastic systems performance optimisation of control tasks undergoing stochastic execution times
Published in International Journal of Control, 2022
Daniele Fontanelli, Luca Greco, Luigi Palopoli
We considered an application scenario where multiple tasks are used to implement independent feedback loops. The tasks are scheduled through a CBS scheduler and different choices of the bandwidth translate into different value for the trace of the steady-state covariance (our QoC metric). We have tackled the problem of optimal bandwidth allocation showing its formulation as an optimisation problem and an efficient solution algorithm. We envisage future work directions in the possible use of different cost functions and of different computation models, where a task execution is not dropped as soon as it violates a deadline and moderate execution delays can be tolerated. As a final consideration, even if this work is directly motivated by a particular industrial problem (CPU sharing), the core of the results in Section 3 and the solution of the optimisation algorithm could potentially apply to a larger class of resource allocation problems for stochastic systems.