Inner Receiver Design for WLAN 802.11n

• Main Authors: Tsung-Hsuan Wu, 吳宗軒
• Other Authors: Hsiang-Feng Chi
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/n3dj5k

碩士 === 國立交通大學 === 電信工程系所 === 96 === In recent years, the booming multi-media consumer electronics applications bring about the demand of high speed media data wireless transmission. To overcome the transmission capacity limit of the traditional wireless systems, MIMO (Multiple Input/Multiple Output) is introduced as the most promising technology. Specially, the MIMO-OFDM technology has been adopted in the next-generation high throughput WLAN (wireless local area network) standard, namely IEEE 802.11n. By using MIMO-OFDM, the data throughput can be dramatically increased compared with the original WLAN 802.11 a/b/g, and the transmission distance to the base station could prolonged. This thesis is focused on the design of the integrated inner receiver algorithms for the proposal of EWC (Enhanced Wireless Consortium) HT (High throughput) WLAN 802.11n PHY layer. The performance of the integrated 802.11n inner receiver is evaluated by using computer simulation. This thesis is purposed to provide a reference design of the WLAN 802.11n receiver algorithms. The inner receiver includes several parts: synchronization (initial synchronization and tracking loop), IQ imbalance compensation, channel estimation, and data detection. The initial synchronization is a composite of packet detection, coarse/fine timing synchronization, and coarse/fine frequency synchronization. In the synchronization tracking loop, there are the functions of residual frequency tracking (phase tracking), sampling frequency offset tracking, and digital resampling. The IQ imbalance compensation comprises the IQ imbalance parameters estimation and the compensation. The channel estimation is accomplished by using the preamble to extract each antenna-pair response. In the detection of data, in addition to the Zero-forcing and the MMSE equalization methods, the V-BLAST is adopted to decode the received data signal.