IQ-imbalance and its compensation for non-ideal analog receivers comprising frequency-selective components
نویسندگان
چکیده
منابع مشابه
IQ-imbalance and its compensation for non-ideal analog receivers comprising frequency-selective components
Within current implementations of mobile terminals, more and more analog components are replaced by appropriate digital processing. On the one hand, the analog front-ends become less complex. On the other hand, more digital signal processing is required to compensate for the spurious effects of the front-end. In this article, the frequency-selective imbalance of the in-phase and quadrature-phas...
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A special pilot pattern across two OFDM symbols is devised for channel estimation in OFDM systems with IQ imbalance at receiver. Based on this pilot pattern, a high-efficiency time-domain (TD) least square (LS) channel estimator is proposed to suppress channel noise by a factor of N/(L+1) in comparison with the frequency-domain LS one in [1] where N and L+1 are the total number of subcarriers a...
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IQ signal processing is widely utilized in today’s communication system. However, it usually faces a common problem of front-end distortion such as IQ imbalance and frequency offset. Effective algorithms exist for estimating and compensating for IQ imbalance as well as frequency offset, when the two problems are treated separately. With both effects present, such algorithms do not lead to usefu...
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Besides low-IF techniques, the direct down conversion or homodyne reception gains more and more attention in academical and industrial research. In this article we describe both, multiplicative and additive mixing within analog direct down conversion front-ends. The effect of gain and phase imbalances of the local oscillator as well as signal path mismatches within the analog front-end lead to ...
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Today a lot of attention is spent on developing inexpensive OFDM receivers. Especially, zero-IF receivers are very appealing, because they avoid costly IF filters. However, this implies IQ demodulation at RF, which therefore cannot be done digitally and thus introduces IQ mismatch. Unfortunately, OFDM is very sensitive to receiver IQ imbalance. Therefore, we developed a new compensation scheme ...
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ژورنال
عنوان ژورنال: Advances in Radio Science
سال: 2006
ISSN: 1684-9973
DOI: 10.5194/ars-4-189-2006