Anzeige
Erschienen in:
2015 | OriginalPaper | Buchkapitel
5. Semi-Blind Multi-CFO Estimation and Equalization for Multiuser CoMP OFDM Systems
verfasst von : Yufei Jiang, Xu Zhu, Eng Gee Lim, Yi Huang, Hai Lin
Erschienen in: Semi-Blind Carrier Frequency Offset Estimation and Channel Equalization
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
Abstract
In the previous chapter, a single-CFO estimation method is presented. In this chapter, we present a low-complexity semi-blind structure with multi-CFO estimation and ICA based equalization structure for multiuser CoMP OFDM systems. A short pilot is carefully designed for each user and has a two-fold advantage. On the one hand, using the pilot structure, a complex multi-dimensional search for multiple CFOs is divided into a number of low-complexity mono-dimensional searches. On the other hand, the cross-correlations between the transmitted and the received pilots are explored to allow simultaneous elimination of permutation ambiguity and quadrant ambiguity in the ICA equalized signals. Simulation results show that, with a low training overhead of 1.6 %, the presented semi-blind system not only outperforms the existing multi-CFO estimation schemes in terms of BER and MSE of multi-CFO estimation, but also achieves a BER performance close to the ideal case with perfect CSI and no CFO at the receiver.