WIMAX INNER RECEIVER DESIGN

• Main Author: Ang, Ken Li
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi PETRONAS 2007
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://utpedia.utp.edu.my/9668/1/2007%20Bachelor%20-%20WIMAX%20Inner%20Receiver%20Design.pdf; http://utpedia.utp.edu.my/9668/

"Igniting broadband wireless access". That is the vision for WiMAX, which is defined in the 802.16 standards to cover the frequency bands within the 2 to 66 GHz region. It promises an OFDM air interface with data rates comparable to wireline services (cable and xDSL). Coupled with QoS provisioning and support for NLOS propagation, WiMAX offers the platform for real time multimedia communications in addition to being able to replace the existing legacy PSTN. WiMAX also becomes the perfect launch pad for service providers to roll out triple play. The standard based products and availability of internet to anyone, anywhere and anytime will almost guarantee the widespread adoption ofWiMAX everywhere. This FYP attempts to simulate the working mechanism of a WiMAX receiver, with focus on synchronization (inner receiver), via simulation in Simulink. The undertaking will involve the baseband physical radio link. The proposed method of synchronization is a novel hybrid of a modified version of the Schmidl and Cox technique and the double sliding window packet detection. The inner receiver deals with synchronization issues such as FFT timing offset and carrier frequency offset. Offsets and impairments are deliberately introduced into the system to ensure that the receiver is totally blind and to fully test the proposed algorithm. Results indicate that the proposed method can harness the best features of both worlds. Frame timing synchronization is achieved accurately without uncertainties of detecting a plateau. On the other hand, frequency offsets are dealt with efficiently using the tried and tested Schmidl and Cox technique. All in all, the proposed synchronization scheme is very well suited for WiMAX systems. The proposed method can achieve rapid synchronization with low overhead.