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MIMO OFDM is a key technique for achieving high data rate in future wireless communication systems. The desired low-cost, low-power and fully integrated implementation of MIMO OFDM systems leads to the application of direct (up/down) conversion architecture, whose performance can be seriously limited by I/Q-imbalance. Thus, the compensation of I/Q-imbalance is a crucial issue in the implementation...
Systems using Orthogonal Frequency Division Multiplexing (OFDM) suffer with carrier frequency offset (CFO), in phase and quadrature phase imbalance (I/Q) due to which there will be large performance degradation. The CFO, I/Q imbalance are caused due to mismatch of carrier frequency at the transmitter and local oscillator frequency at the receiver. This paper presents a novel approach for joint estimation...
MIMO OFDM is a very promising technique for high-speed wireless transmission. By applying the Direct Conversion Architecture (DCA), low-cost, low-power and fully integrated implementation of such systems is enabled. However, the performance of DCA may be seriously limited by I/Q-imbalance, which shows frequency selectivity in broadband systems. In this paper, we consider an indoor scenario and present...
Blind and semiblind channel estimation is a topic that enjoyed explosive developments throughout the nineties, and then came to a standstill, probably because of perceived unsatisfactory performance. Blind channel estimation techniques were developed and usually evaluated for a given channel realization, i.e. with a deterministic channel model. Such blind channel estimates, especially those based...
In this paper, we study the joint estimation of inphase and quadrature-phase (I/Q) imbalance, carrier frequency offset (CFO), and channel response for multiple-input multipleoutput (MIMO) orthogonal frequency division multiplexing (OFDM) systems using training sequences. A new concept called channel residual energy (CRE) is introduced. We show that by minimizing the CRE, we can jointly estimate the...
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