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I/Q mismatch cancellation for MIMO-OFDM systems

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2 Author(s)
Rao, R.M. ; Henry Samueli Sch. of Eng. & Appl. Sci., California Univ., Los Angeles, CA, USA ; Daneshrad, B.

MIMO-OFDM systems are gaining prominence in high data rate applications due to their increased spectral efficiency, in MIMO-OFDM systems, I/Q mismatch causes interference between the frequency mirror subcarriers. This can significantly degrade and limit the performance of the system. We present a mathematical analysis of the effects of I/Q gain, delay and phase mismatches in MIMO-OFDM systems. We show the impact of I/Q mismatch when more antennas are added. We also derive a linear optimal solution to cancel all three I/Q mismatches and an RLS based adaptive filter for the same. We show simulation results and results on an experimental testbed.

Published in:

Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on  (Volume:4 )

Date of Conference:

5-8 Sept. 2004

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