Joint compensation of IQ imbalance, frequency offset and phase noise in OFDM receivers
✍ Scribed by Tubbax, Jan ;Van der Perre, Liesbet ;Donnay, Stéphane ;Engels, Marc ;Moonen, Marc ;De Man, Hugo
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 205 KB
- Volume
- 15
- Category
- Article
- ISSN
- 1124-318X
- DOI
- 10.1002/ett.974
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✦ Synopsis
Abstract
Zero‐IF receivers are getting a lot of attention because of their potential to enable low‐cost OFDM terminals. However, zero‐IF receivers also introduce IQ imbalance which can have a huge impact on the performance. Rather than increasing component cost to decrease the IQ imbalance, an alternative is to tolerate the IQ imbalance and compensate for it digitally. Current solutions either require additional analog hardware or are based on digital algorithms that converge too slowly for bursty communication. Moreover, the impact of a frequency offset and phase noise on the IQ imbalance estimation/compensation problem is not considered. In this paper, we analyze the joint IQ imbalance/frequency offset/phase noise estimation and propose a low‐cost, highly effective, all‐digital mitigation scheme. For large IQ imbalance large frequency offsets and in the presence of phase noise our solution still results in an average implementation loss below 0.5 dB. It, therefore, enables the design of low‐cost, lowcomplexity OFDM receivers. Copyright © 2004 AEI