On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Blind multipath MIMO channel parameter estimation using the Parafac decomposition
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
TST-MUSIC for joint DOA-delay estimation
IEEE Transactions on Signal Processing
Interpolation based transmit beamforming for MIMO-OFDM with limited feedback
IEEE Transactions on Signal Processing
Adaptive MIMO-OFDM based on partial channel state information
IEEE Transactions on Signal Processing
Ordered subcarrier selection algorithm for OFDM-based high-speed WLANs
IEEE Transactions on Wireless Communications
A reduced CSI feedback approach for precoded MIMO-OFDM systems
IEEE Transactions on Wireless Communications
Optimization and performance evaluation of multicarrier transmission
IEEE Transactions on Information Theory
Modulation and coding for linear Gaussian channels
IEEE Transactions on Information Theory
Space-time block codes from orthogonal designs
IEEE Transactions on Information Theory
Multicarrier modulation for data transmission: an idea whose time has come
IEEE Communications Magazine
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
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This paper presents a new bit and power allocation algorithm for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. The optimal power allocation algorithm in terms of maximum capacity in MIMO-OFDM systems is given by the joint space-frequency water-filling (JSF-WF) algorithm. This algorithm involves multiple singular value decompositions and an iterative water-filling calculation over the subchannels, and therefore, has a high computational complexity. We present an algorithm with reduced bit and power allocation complexity. The proposed algorithm is based on a geometric channel model consisting of several clusters of subpaths, characterized by a set of physical parameters. It performs beamforming with null-steering towards the clusters' directions-of-departure, such that the frequency-selective MIMO channel is transformed into a flat fading MIMO channel. Thus, constant bit and power allocation over the frequency domain can be performed, which is simple to compute and implement. The performance of the proposed algorithm is evaluated and compared to the JSF-WF algorithm in terms of bit-error-rate, for known and misspecified channel model parameters. It is demonstrated that the proposed algorithm performance is slightly lower than the JSF-WF performance, while it significantly reduces the complexity of the allocation algorithm.