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Limited feedback in multiuser multi-antenna systems is a practical technique for providing partial channel state information (CSI) to the transmitter. Unfortunately, it is known that the number of feedback bits per mobile terminal must be scaled with the number of transmit antennas and system signal to noise ratio. Therefore very high resolution codebooks are needed to approach the theoretically achievable...
In next generation broadband wireless access (BWA) systems, cell shrinkage and blind zones might occur at cell edges due to constraints on transmission power and the increase in propagation loss with broadband and higher frequency bands, respectively. Thus, hierarchical BWA systems consisting of micro and macro base transceiver stations (BSs) installed around the macro BS are considered as one of...
This paper proposes non-iterative coordinated beamforming algorithms for a multiuser MIMO (multiple input multiple output) system with multiple antennas at the transmitter and multiple users, each with multiple receive antennas. The transmitter uses linear beamforming to convey information to each user, while each receiver uses a quantized combining vector, sent from the transmitter via a low-rate...
We carried out field trials of the developed FDD-SDMA packet cellular testbed system and demonstrated the effectiveness of the proposed forward link beamforming algorithm. Our forward link beamforming algorithm use not only unidirectional access terminal estimation but also angular spread estimation that is the proposed method and available to extract angular spread characteristics from a correlation...
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