Introduction This model simulates an 802.11ad single carrier (SC) link with RF beamforming. Multiple packets are transmitted through free space, then RF beamformed, demodulated and the PLCP service data units (PSDU) are recovered.
The PSDUs are compared with those transmitted to determine the packet error rate. The receiver performs packet detection, timing synchronization, carrier frequency offset correction and unique word based phase tracking.
![Receiver Receiver](/uploads/1/2/5/4/125432097/489717293.png)
Conclusion and Future Work Each module of the Ethernet receiver section has. Subhash Kulkarni, “VHDL Modeling of Wi-Fi MAC Layer for Transmitter”.
The MATLAB function block allows Simulink models to use MATLAB® functions. In this example, an 802.11ad SC link modeled in Simulink uses WLAN Toolbox functions called using MATLAB function blocks. For an 802.11ad baseband simulation in MATLAB, see the example. A baseband transmitter which generates a random PSDU and an 802.11ad SC packet. A free space channel. A receive antenna array which supports up to 16 elements.
This module allows control of the array geometry, number of elements in an array, operating frequency, and receiver direction. A 16 channel RF receiver module to process the RF signals. This receiver module includes low noise amplifiers, phase shifters, combiners, and a down-convertor. This module allows control of the beamforming direction used to calculate the corresponding phase shifts.
A baseband receiver which recovers the transmitted PSDU by performing packet detection, time and frequency synchronization, channel estimation, PSDU demodulation, and decoding. The system diagnostics includes the display of equalized constellation and the obtained packet error rate. The following sections describe the transmitter and receiver in more detail.
Baseband Transmitter The baseband transmitter block creates a random PSDU and encodes the bits to create a single packet waveform based on the MCS and PSDU length values in the Model Parameters block. The packet generator block uses the function to encode a packet.
The phase shift applied to each element is calculated based on the beamforming direction. This is provided by the user and indicates the direction of the main beam. The receiver maximizes the SNR when the receiver's main beam points to the transmitter. Transmitter is omnidirectional and the receiver direction (az,el) indicates the direction of incident signal. The scenario where the receiver direction and the beamforming direction are different is shown. In this case, there will be a reduction in the received signal power leading to high packet error rate (PER) and error vector magnitude (EVM).
![Mac Mac](/uploads/1/2/5/4/125432097/810642609.jpg)
The results section shows these values.
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For the wireless communication in radio frequency range, IEEE 802.11 is one of the many standards available. IEEE 802.11b defines the medium access control layer MAC for wireless local area networks.
The wireless local area network, WLAN is dominated by IEEE 802.11 standard. It becomes one of the main focuses of the WLAN research. Now most of the ongoing research projects are simulation based as their actual hardware implementation is not cost effective. The main core of the IEEE 802.11b standard are the CSMA CA, Physical and MAC layers. But only MAC layer for transmitter is modeled in this paper using the VHDL. The VHDL (Very High Speed Hardware Description Language) is defined in IEEE as a tool of creation of electronics system because it supports the development, verification, synthesis and testing of hardware design, the communication of hardware design data and the maintenance, modification and procurement of hardware.
It is a common language for electronics design and development prototyping. The main purpose of the IEEE 802.11 standard is to provide wireless connectivity to devices that require a faster installation, such as Laptops, PDA's or generally mobile devices inside a WLAN. MAC procedures are defined here for accessing the physical medium, which can be infrared or radio frequency. Here Wi-Fi MAC transmitter module is divided in to 5 blocks i.e. Data unit interface block, controller block, pay load data storage block, MAC header register block, data processing block. In this paper, we are considering only two blocks i.e pay load data storage block & data processing block. So other blocks i.e.
Data unit interface block, controller block, MAC header register block are not discussed further in this paper.