The improvement of adaptive bit and power loading algorithm with low complexity in MIMO-OFDM systems
IMSAA'09 Proceedings of the 3rd IEEE international conference on Internet multimedia services architecture and applications
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The eigenmode decomposition of spatial channel is the preconditions of adaptive power allocations in the present MIMO-OFDM systems. These eigenmodes are generally obtained by the singular value decompositions of the channel matrix at every carrier. However, the decomposition in this way ignored the effects of space-time codes on system performance and it has great complexity for the case with a large number of carriers. A new eigenmode decomposition is proposed to integrate the space time codes in system models, which could be conducted simultaneously by many carriers with simple implementation. Numerical results show that the new eigenmode decomposition is more robust than the classical approaches.