Gpp 3 solutions to updating of firmware
Configuration of the transceiver's MIMO front end, i.e., the antenna weight coefficients, before sending, or receiving WLAN frames.
Measurement of the channel parameters to determine the optimal weights for every WLAN connection.
Therefore, the signal processing has to be calibrated by the baseband to adapt to the RF impairments.
This mainly considers the correlation between real and imaginary parts of the vector modulator approach.
The model is used to verify the functional correctness of the MAC design and to investigate the performance.
The MAC processor architecture is presented in Section 2.
The baseband architecture is presented in Section 4.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.Functional modules of the baseband processor are described in Sections 5, 6 and 7.The implementation details are presented in Section 8 and test details in Section 9. The MAC protocol complies with the IEEE Standard 802.11 and accounts for the following extra requirements due to RF-MIMO technology: Maintenance of a database of active and available users (MAC address, number of antennas at the user, last optimum weights, etc.).
Moreover, these algorithms must determine the optimal complex weights to be applied at each antenna (implemented by means of vector modulators).