標題: 應用於無線多輸入多輸出基頻處理器之頻率相依的IQ不平衡效應之研究
The Study of All-Digital Compensation for I/Q Mismatch with Frequency Dependent Imbalance in MIMO-OFDM Baseband Designs
作者: 賴煒棋
Wei-Chi Lai
許騰尹
Terng-Yin Hsu
資訊科學與工程研究所
關鍵字: 高斯雜訊;IQ不平衡效應;頻率相依誤差;震盪器;多輸入多輸出傳送系統;正交分頻多工傳輸;射頻;封包錯誤率;AWGN;I/Q-M;FDI;LO;MIMO;OFDM;RF;PER
公開日期: 2005
摘要: 直接降頻的接收器(DCR)架構目前在工業和學術界已經成為一個趨勢,因為它擁有體積小,便宜和消耗更少動力的優勢。但是,這種架構會一起伴隨著一些射頻(RF)的不完美效應,像是直流電(DC)偏移,頻率偏移,以及I/Q不平衡效應等等…在這篇論文中,主要是研究頻率相依的I/Q不平衡效應。 為了使無線接收器上的類比I/Q處理器得到令人滿意的效能,實部和虛部的匹配變得至關重要。 此論文提出一個新穎的基頻處理方法來估計和補償在MIMO-OFDM系統下,頻率相依的I/Q不平衡效應。 提出的方法只要使用一次的估算,就能夠估計並且補償非理想效應,它可以容忍的範圍包含了震幅誤差2dB, 相位誤差20 度,以及實部的低通濾波器是 [1 0.1 ],虛部的低通濾波器是 [0.1 1 ] 的情況。
A direct-conversion receiver (DCR) architecture becomes a trend in industry and academic world nowadays because it is small, cheap and less power-consuming. This kind of architecture, however, accompanies with some radio frequency (RF) imperfections such as the direct current (DC) offset, frequency offset, inphase/quadrature (I/Q) imbalance, and etc. In this thesis, it focuses on the topic of the RF impairment of frequency dependent I/Q imbalance. To achieve satisfactory performance in analog I/Q (inphase/quadrature) processing based wireless receivers, the matching of amplitudes and phases of the I and Q branches becomes vital. In this thesis, a novel baseband I/Q estimation and compensation technique is proposed to overcome the frequency dependent I/Q imbalance in MIMO-OFDM systems. The proposed method uses a one-shot algorithm which is able to estimate and compensate the non-ideal effect up to gain error 2 dB, phase error 20 degree, and the low pass filter of the real part is [1 0.1], the low pass filter of the image part is [0.1 1].
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009317504
http://hdl.handle.net/11536/78716
Appears in Collections:Thesis


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  1. 750401.pdf