Joint channel and carrier frequency offset estimation for multi-user MIMO-OFDM uplink transmissions

doi:1005-8885 (2008) 01-0075-05

Acta Metallurgica Sinica(English letters) ›› 2008, Vol. 15 ›› Issue (1): 75-79.doi: 1005-8885 (2008) 01-0075-05

• Wireless • Previous Articles Next Articles

Joint channel and carrier frequency offset estimation for multi-user MIMO-OFDM uplink transmissions

Wireless Technology Innovation Institute and Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2007-05-31 Revised:1900-01-01 Online:2008-03-31
Contact: Li Jing

Abstract

Abstract:

This article proposes a new algorithm of joint channel and carrier frequency-offset (JCCFO) estimation for multi-user multi-input and multi-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. A least square (LS) channel estimation and a carrier frequency offset (CFO) correlation estimation are combined in this contribution. CFOs are generally estimated using training sequences in a special synchronization timeslot. In this contribution, CFO estimation is further improved by taking advantages of channel estimation based on pilot symbols in traffic timeslots. The CFOs can be first obtained from the primary channel estimation. And then, with the knowledge of the CFOs estimated, channel estimation can be enhanced greatly. Computer simulation results indicate that the proposed JCCFO scheme is of good performance. Besides, the computational complexity is low.

Key words:

multi-user MIMO-OFDM;joint channel and carrier frequency offset estimation;least square;correlation

CLC Number:

TN929.5

References

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Joint channel and carrier frequency offset estimation for multi-user MIMO-OFDM uplink transmissions

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