預編碼正交頻分多址系統下相位雜訊估測及補償

Phase Noise Estimation and Compensation in Precoded-OFDMA Wireless Systems

陳漢翔(Han-Shiang Chen)

指導教授 ： 蘇柏青

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201703035

摘要

毫米波通訊因為有很大的未使用頻譜，因此在未來的第五代移動通
訊系統下佔了一席地位。但是毫米波通訊也遇到射頻上的不完美，包
含非線性的功率放大器、IQ 不平衡、載波頻率偏移及相位雜訊。這篇
論文討論相位雜訊的問題。相位雜訊在通訊系統中會隨著時間改變，
即使通道完全沒有改變，依舊會影響通訊系統的表現。在毫米波的情
況下，因為相位雜訊所造成的影響更大，所以導致我們無法忽略它，
因此我們必須要一直去估測相位雜訊的數值和進行補償。除此之外，
因為無限通訊系統下多重存取的需求，我們必須要在不同裝置有不同
相位雜訊的情況下去估測所有裝置的相位雜訊。這篇論文我們提出了
一個方法，在只使用部分頻帶的情況下可以估測相位雜訊，而不用使
用全部的頻帶。我們提出的方法可以使用在多重存取的情況下並達到
令人滿意的表現。

關鍵字

毫米波 ； 相位雜訊 ； 正交頻分多址

並列摘要

In future 5G scenario, millimeter-wave(mmWave) wireless communication
systems play an important role due to its large unused bandwidth. However,
there are severe radio field(RF) impairments deteriorating the bit-errorrate
(BER) performance in mmWave communication including power amplifier
non-linearity, IQ imbalance, carrier frequency offset (CFO) and phase
noise. We focus on phase noise problem in the thesis. There will be an unknown
phase noise changing even if the channel doesn’t change from block
to block. The impact of phase noise in mmWave communication will be large
enough so we can’t ignore it. Hence we have to estimate and compensate the
effect of phase noise. Besides, due to the need of multiple access, we need
to deal with phase noise problem since every device has its own phase noise.
In the thesis we proposed a method to estimate phase noise in subband-based
wireless communication system. The method can be used to estimate and
compensate phase noise only using subband instead of whole band. With
this method, we can handle phase noise in multiple access scenario and get a
competitive performance to other work.

並列關鍵字

millimeter-wave ； phase noise ； subband ； OFDMA

參考文獻

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