MAC BEACON EMULATOR SERIAL
MAC BEACON EMULATOR FULL

First, the impairments of the RF front-end are considered in the baseband processor. Several challenges are addressed in the PLCP. The RF-MIMO analogue front-end (AFE) needs new algorithms to exploit the available spatial diversity of the MIMO channel.

MAC BEACON EMULATOR SERIAL

The vector modulator is connected to the RF control unit by a serial peripheral interface. These techniques are based on look-up tables or neural network approaches. Integrating additional calibration options in the RF front-end and the RF control unit allow an internal adaptation to impairments of the fabrication process and a feedback to the baseband processing. The weights provided by the baseband are then transferred into corresponding values of the vector modulator using the previously determined relationship and these new weights control the vector modulator. The characteristics of the vector modulator are analysed by this module and stored in an internal memory. Compensation is achieved by a calibration performed by the RF control unit in Figure 1. This mainly considers the correlation between real and imaginary parts of the vector modulator approach. Therefore, the signal processing has to be calibrated by the baseband to adapt to the RF impairments. Integrating the signal processing in analogue circuits is limited in the maximum achievable resolution because of noise processes, process variations or nonlinear behaviour of the devices.

MAC BEACON EMULATOR FULL

In MIMAX, the same weight is used for all subcarriers in OFDM transmissions, whereas it is possible to weight each subcarrier independently from the others in the full MIMO transmission scheme. There are several differences between the MIMAX approach and the full multiplexing MIMO approach. Particularly, these tasks are not needed in the IEEE802.11a scheme, which is specified for SISO communication. Furthermore, the spatial diversity must be exploited, possible impairments in the RF spatial processing have to be compensated and the MIMO channel has to be estimated. This task is common for all communication schemes defined by the IEEE Standard 802.11. The PLCP pursues mapping MAC protocol data units in PMD layer compliant frame formats.

They demand for changes in the physical layer convergence (PLC) and medium access control (MAC) protocols to optimally exploit the benefits of the new RF front-end. Redesigns have mostly been done in the physical medium-dependent (PMD) layer. Multiple antennas are used to increase the transmission reliability through spatial diversity.

Mac beacon emulator