Elements of information theory
Elements of information theory
Convex Optimization
IEEE Transactions on Signal Processing
Optimal insertion of pilot symbols for transmissions over time-varying flat fading channels
IEEE Transactions on Signal Processing
Semi-Blind Channel Estimation Using the EM Algorithm in Iterative MIMO APP Detectors
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
How much training is needed in multiple-antenna wireless links?
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
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We consider the achievable rate for frequency-selective fading channels when the channel state information (CSI) is to be estimated at the receiver. Since the estimated CSI is not perfect, the achievable rate must be degraded from that with perfect CSI. Using the rate-distortion theory, we study an upper bound on the achievable rate and investigate how the achievable rate can be maximized through an optimization problem by allocating the resources such as degrees of freedom (the transmission time in our work or transmission power) for the exploration of CSI (i.e., the channel estimation) using pilot symbols, and the exploitation of channels to transmit data symbols. Although our study is based on some ideal assumptions, the results could help develop flexible communication systems such as software defined radio (SDR) to achieve a best performance by optimizing radio resources for unknown channels.