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MIMO Broadcast Channels with Finite Rate Feedback

MIMO Broadcast Channels with Finite Rate Feedback,10.1109/TIT.2006.883550,IEEE Transactions on Information Theory,Nihar Jindal

MIMO Broadcast Channels with Finite Rate Feedback   (Citations: 454)
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Multiple transmit antennas in a downlink channel can provide tremendous capacity (i.e. multiplexing) gains, even when receivers have only single antennas. However, receiver and transmitter channel state information is generally required. In this paper, a system where the receiver has perfect channel knowledge, but the transmitter only receives quantized infor- mation regarding the channel instantiation is analyzed. Simple expressions for the capacity degradation due to finite rate feedback as well as the required increases in feedback load per mobile as a function of the number of access point antennas and the system SNR are provided.
Journal: IEEE Transactions on Information Theory - TIT , vol. 52, no. 11, pp. 5045-5060, 2006
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    • ...One approach for gaining insight about the DoF behavior under imperfect CSIT has thus been to seek higher DoF under quantized CSIT by improving CSIT quality through a sufficiently fast scaling of the quantization rate with SNR [5]–[8]...

    Chinmay S. Vazeet al. The Degrees of Freedom Region of the Two-User MIMO Broadcast Channel w...

    • ...We first analyze the structure of CDI of CoMP channel, which is the essential information for downlink MIMO precoding [7]...
    • ...Random vector quantization is used for per-cell partial CDI quantization [7]...

    Di Suet al. Quantization based on per-cell codebook in cooperative multi-cell syst...

    • ...Quantization of the CSI parameters further facilitates the feedback reduction in MIMO systems, e.g., see [12], [13] and [14], and when similar techniques are applied to OBF, we can achieve an additional feedback reduction as shown in [15] and [16]...

    Tharaka Samarasingheet al. The Feedback-Capacity Tradeoff for Opportunistic Beamforming

    • ...In [3], [5]–[8], [30] such a setting is considered...
    • ...In [5], the authors show that at high signal to noise ratios (SNRs), the feedback rate required per user must grow linearly with the SNR (in dB) in order to obtain the full MIMO BC multiplexing gain...

    Jubin Joseet al. Pilot Contamination and Precoding in Multi-Cell TDD Systems

    • ...Following the studies on quantized channel feedback in [7], [8], we assume that the receiver is able to obtain perfect knowledge of h�� , but can send back only a quantized version of the CDI, i.e., g�� = h�� /∥h�� ∥, to the transmitter due to limited feedback channel bandwidth...
    • ...To gain analytical insights on the impact of quantized CDI, we adopt the random vector quantization (RVQ) codebook [7], [8], where each codeword is a randomly and independently generated �� �� -dimensional unit-norm complex Gaussian vector and, thus, is isotropically distributed in ℂ 1×��...
    • ...It has been shown in [7], [8] that the behavior of RVQ can be closely approximated by this model, even for small �� . Specifically, the quantization cell �� ℓ in (3) is approximated by...
    • ...[19], and that ∥h�� ∥ and sin 2 �� are statistically independent [8]...

    Shih-Chun Linet al. On the Impact of Quantized Channel Feedback in Guaranteeing Secrecy wi...

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