Training Based Channel Estimation in MIMO-OFDM Systems
نویسندگان
چکیده
OFDM combined with the MIMO technique has become a core and attractive technology in future wireless communication systems and can be used to both improve capacity and quality of mobile wireless systems. Accurate and efficient channel estimation plays a key role in MIMO-OFDM communication systems, which is typically realized by using pilot or training sequences by virtue of low complexity and considerable performance. In this paper, we discuss some methods for channel estimation based training symbols in MIMO-OFDM systems. The results confirm the superiority of the represented methods over the existing ones in terms of bandwidth efficiency and estimation error.
منابع مشابه
A Novel Preamble Design for Channel Estimation in Mimo- Ofdm Systems Resulting in Enhanced Throughput
Multiple Input Multiple Output (MIMO) system combined with orthogonal frequency division multiplexing (OFDM) provides a reliable solution for enhanced data rate next generation wireless systems as MIMO produces additional parallel channels in spatial domain which allows high data rates to be achieved without extra bandwidth and transmitted power. While OFDM provides high bandwidth efficiency an...
متن کاملChallenge of Channel Estimations and Its Way Out in MIMO OFDM Systems for Mobile Wireless Channels
In current common channel estimation schemes for MIMO OFDM systems, channel state information is usually achieved by estimating channels according to frequency domain pilot sequences. However, when the length of MIMO OFDM symbols is larger than that of wireless channel delay, there are two intractable issues in the case of cellular fast fading channel scenarios with large numbers of users, i.e....
متن کاملSignal-Perturbation-Free Semi-Blind Channel Estimation for MIMO-OFDM Systems
Signal-Perturbation-Free Semi-Blind Channel Estimation forMIMO-OFDM Systems Feng Wan, Ph.D.Concordia University, 2009 Multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) has been considered as a strong candidate for the beyond 3G (B3G) wirelesscommunication systems, due to its high data-rate wireless transmission performance.It is well known...
متن کاملJoint Synchronization and Channel Estimation with Optimum Training Sequences for OFDM-Based Systems Using EM Algorithm
In this paper, we propose a joint carrier frequency synchronization and channel estimation algorithm for multipleinput and multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. A major challenge to MIMO-OFDM systems is how to obtain the channel state information accurately and promptly for coherent detection of information symbols and channel synchronization. MIMOOFDM ...
متن کاملOn the optimality of training signals for MMSE channel estimation in MIMO-OFDM systems
In this paper, we investigate the optimality of training signals for linear minimummean square error (LMMSE) channel estimation in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) with frequency-selective fading channels. This is a very challenging problem due to its mathematical intractability and has not been analytically solved in the literature. Using ...
متن کامل