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Channel Magnifying Limited Feedback Technique for FDD Massive MIMO Systems

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Abstract

A limited feedback system, so-called, channel magnifying (CM) is proposed for a downlink (DL) frequency-division duplex (FDD) massive multiple-input multiple-output (MIMO) system. Although massive MIMO system has received significant research interest as a key technology for beyond 4G wireless communications systems, it has a number of issues that needs to be technically addressed. Among such issues is the difficulty of acquiring channel state information at transmitter for an FDD massive MIMO system which cannot exploit channel reciprocity as in a time-division duplex system. The proposed CM technique makes it possible to support a few user equipments in DL FDD massive MIMO system by finding a balance between spatial resources and channel quantization error (CQE). By choosing a subchannel with low CQE, CM can secure multiplexing gain at high SNR based on a fixed size codebook. Two types of subchannel indicator alignment (SIA) schemes are introduced for efficient interference nulling for the proposed CM technique. Specifically, we discuss how to maximize the sumrate of CM through genie added SIA and minimum CQE based SIA. Simulation results show that the sum rate of the proposed CM has a higher multiplexing gain than that of random vector quantization, especially when the number of transmit antennas is sufficiently large.

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Notes

  1. Without loss of generality, this example can be directly expanded to the general MIMO system. Also, note that the channel of each UE in Fig. 2 is represented by a normalized line because only the directional information of channel is conveyed by PMI as given in (3) and (4).

  2. In this case, the BS cannot choose a proper interference nulling precoder because of rank deficiency of the quantized CSI.

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Authors and Affiliations

  1. Digital Media and Communications R&D Center, Samsung Electronics 416, Maetan-3dong, Yengtong-gu, Suwon-si, 443-742, South Korea

    Hoondong Noh & Younsun Kim

  2. Department of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea

    Chungyong Lee

Authors
  1. Hoondong Noh
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  2. Younsun Kim
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  3. Chungyong Lee
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Correspondence to Chungyong Lee.

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Noh, H., Kim, Y. & Lee, C. Channel Magnifying Limited Feedback Technique for FDD Massive MIMO Systems. Wireless Pers Commun 88, 953–962 (2016). https://doi.org/10.1007/s11277-016-3222-z

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