Baseband Receiver Design for Next-Generation High-Throughput Wireless LAN with MIMO-OFDM Technology
Date Issued
2005
Date
2005
Author(s)
Ding, Zih-Yin
DOI
zh-TW
Abstract
The establishment of the next-generation high throughput wireless LAN, IEEE 802.11n, has started. It is a standard which aims to provide high throughput transmission for the demand of several novel multimedia applications. In this thesis, a base band receiver for next generation wireless LAN is proposed with the transmitter architecture and packet format according to the proposal of IEEE 802.11n.
The inner receiver can be divided into several parts: initial synchronization, tracking loop, channel estimation and data recovery. The initial synchronization includes packet detection, coarse and fine symbol boundary estimation, fractional carrier frequency offset estimation. A fine symbol boundary estimation which is robust to channel noise is introduced. The tracking loop includes joint estimation of residual fractional carrier frequency offset and sampling clock offset. The receiver exploits the orthogonal training sequence to find a set of least square error estimation of the channel. The data recovery is composed of MIMO signal decoding and soft demapping. The method of MIMO signal decoding is related to transmission mode which is adjusted depending on whether the transmitter has channel information. When the transmitter owns accurate channel information, the transmitted signal is pre-processed before transmitting and then the multiple transmitted streams can be detected independently. Therefore the complexity of receiver can be reduced. The MIMO signal decoding result is sent to soft demampper to calculate bit metrics which are the input of soft decision Viterbi decoder.
In addition to architecture design of receiver, the circuit design of all functional blocks which have been verified with Novas Debussy are also presented.
Subjects
多輸入多輸出
正交分頻多工
無線區域網路
MIMO
OFDM
wireless LAN
Type
thesis
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