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Author: Tittelbach-Helmrich, Klaus × Type: Article ×

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    MAC and baseband processors for RF-MIMO WLAN
    (London : BioMed Central, 2011) Stamenkovic, Zoran; Tittelbach-Helmrich, Klaus; Krstic, Milos; Ibanez, Jesus; Elvira, Victor; Santamaria, Ignacio
    The article describes hardware solutions for the IEEE 802.11 medium access control (MAC) layer and IEEE 802.11a digital baseband in an RF-MIMO WLAN transceiver that performs the signal combining in the analogue domain. Architecture and implementation details of the MAC processor including a hardware accelerator and a 16-bit MAC-physical layer (PHY) interface are presented. The proposed hardware solution is tested and verified using a PHY link emulator. Architecture, design, implementation, and test of a reconfigurable digital baseband processor are described too. Description includes the baseband algorithms (the main blocks being MIMO channel estimation and Tx-Rx analogue beamforming), their FPGA-based implementation, baseband printed-circuit-board, and real-time tests.
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    Digital DC blocker filters
    (Berlin : De Gruyter, 2021) Tittelbach-Helmrich, Klaus
    This paper mathematically investigates a special kind of digital infinite-impulse response (IIR) filters, suitable for filtering out very low frequencies near zero from digital signals. We investigate the transfer functions of such filters from 1st to 3rd order and provide formulas to calculate the filter coefficients from the desired cutoff frequency.