Title :
I/Q mismatch cancellation for MIMO-OFDM systems
Author :
Rao, Raghu Mysore ; Daneshrad, Babak
Author_Institution :
Henry Samueli Sch. of Eng. & Appl. Sci., California Univ., Los Angeles, CA, USA
Abstract :
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.
Keywords :
OFDM modulation; adaptive filters; antenna arrays; interference suppression; radiofrequency interference; software radio; I/Q mismatch cancellation; MIMO-OFDM systems; adaptive filter; delay mismatch; frequency mirror subcarrier; interference; phase mismatch; software radio; spectral efficiency; Adaptive filters; Degradation; Delay effects; Frequency dependence; Interference; MIMO; Mirrors; OFDM modulation; Rails; Resonance light scattering;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on
Print_ISBN :
0-7803-8523-3
DOI :
10.1109/PIMRC.2004.1368812
