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Quantization based on per-cell codebook in cooperative multi-cell systems

Quantization based on per-cell codebook in cooperative multi-cell systems,10.1109/WCNC.2011.5779427,Di Su,Xueying Hou,Chenyang Yang

Quantization based on per-cell codebook in cooperative multi-cell systems   (Citations: 3)
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Cooperative base station transmission, which is also called coordinated multi-point (CoMP) transmission, can signifi- cantly enhance spectrum efficiency of future cellular systems. To gain the promised benefits of coherent CoMP transmission, lim- ited feedback is necessary for conveying channel state information in frequency division duplex systems. In this paper, we address per-cell codebook based quantization for CoMP channels, which is flexible and scalable in practice. We first analyze the structure of channel direction information (CDI) of CoMP channel and its connection with per-cell channels, then provide an approximate method to re-construct the CoMP CDI. Exploiting the degrees of freedom provided by using the per-cell codebook, we present and compare several ways of generating global codebook and selecting per-cell codewords for CoMP channel quantization. Simulation results are given that validate our analysis.
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    • ...As a result, it is more desirable to design per-cell codebook based limited feedback scheme for CoMP systems [5], [8], where single cell codebooks are applied for quantizing the channel between each BS and the MS. In the per-cell codebook feedback scheme, the codeword for each per-cell channel can be selected either jointly or separately [8]...
    • ...As a result, it is more desirable to design per-cell codebook based limited feedback scheme for CoMP systems [5], [8], where single cell codebooks are applied for quantizing the channel between each BS and the MS. In the per-cell codebook feedback scheme, the codeword for each per-cell channel can be selected either jointly or separately [8]...
    • ...Nonetheless, if perfect phase ambiguity information can be acquired, its negative impact will be compensated, and the independent codeword selection will even outperform the joint codeword selection as shown in [8]...

    Fang Yuanet al. Phase Ambiguity Quantization for Per-Cell Codebook Based Limited Feedb...

    • ...The quantization of multi-cell channels is based on per-cell codebook [4] and independent codeword selection [5], which is not only flexible but also of low complexity for practical application...

    Xueying Houet al. How much feedback overhead is required for base station cooperative tr...

    • ...In percell codebook feedback schemes, the codeword for each percell channel can be selected either jointly or separately [9]...

    Xueying Houet al. Codebook Design and Selection for Multi-Cell Cooperative Transmission ...

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