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Many candidate technologies for future wireless communication systems (e.g., multi-user MIMO, interference alignment), rely on accurate Channel State Information (CSI) at the Transmitter (CSIT) to determine the appropriate multi-antenna pre-processing steps. Thus, in frequency division duplexing systems, a dedicated feedback link has to be provided to each attached user for CSI reporting. In order...
In this paper, we present algorithms for the quantization of a correlated unit norm random vector process. Such algorithms are important, e.g., for channel vector quantization in wireless communication systems. Starting from a quantization codebook that uniformly quantizes the unit sphere, we propose to iteratively adapt the codebook to the channel statistics, in order to improve the quantization...
In this work, we consider the calculation of channel state information (CSI) feedback for frequency selective OFDM based multiple input single output (MISO) wireless communication systems. We focus on the quantization and feedback of the normalized MISO channel vector which is required, e.g., for multi-user beamforming systems. Such systems require accurate CSI at the transmitter to avoid interference...
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