MASSIVE MIMO

Massive MIMO

The concept of wireless systems employing a large number of transmit antennas, often dubbed massive multipleinput multiple-output (MIMO) systems, has been evolving over the past few years. It was found in that adding more antennas at the base station is always beneficial even with very noisy channel estimation because the base station can recover information even with a low signal-to-noise-ratio (SNR) once it has sufficiently many antennas. This motivates the concept of using a very large number of transmit antennas, where the number of antenna elements can be at least an order of magnitude more than the current cellular systems (10s-100s). Massive MIMO systems have the potential to revolutionize cellular deployments by accommodating a large number of users in the same time-frequency slot to boost the network capacity and by increasing the range of transmission with improved power efficiency.

 

I am interested in implementing practical massive MIMO systems. Especially, the following topics are my main research interest in massive MIMO.

 

- Limited feedback designs for FDD massive MIMO [1-9]

- Channel training designs for FDD massive MIMO [10-11]

- Receiver designs and analysis using low-resolution ADCs [12-15]

 

[1] J. Choi, Z. Chance, D. J. Love, and U. Madhow, "Noncoherent Trellis-Coded Quantization: A Practical Limited Feedback Technique for Massive MIMO Systems," IEEE Transactions on Communications, vol. 61, no. 12, pp. 5016-5029, Dec. 2013.

[2] J. Choi, D. J. Love, and T. Kim, "Trellis-Extended Codebooks and Successive Phase Adjustment: A Path from LTE-Advanced to FDD Massive MIMO Systems," IEEE Transactions on Wireless Communications, vol. 14, no. 4, pp. 2007-2016, Apr. 2015.

[3] B. Lee, J. Choi, J. Seol, D. J. Love, and B. Shim, "Antenna Grouping based Feedback Compression for FDD-based Massive MIMO Systems," IEEE Transactions on Communications, vol. 63, no. 9, pp. 3261-3274, Sep. 2015.

[4] J. Choi, Z. Chance, D. J. Love, and U. Madhow, "Noncoherent Trellis Coded Quantization for Massive MIMO Limited Feedback Beamforming," in UCSD Information Theory and Applications Workshop, Feb. 2013. (invited)

[5] J. Choi, D. J. Love, and U. Madhow, "Limited Feedback in Massive MIMO Systems: Exploiting Channel Correlations via Noncoherent Trellis-Coded Quantization," in Proc. of Conference on Information Sciences and Systems, Mar. 2013.

[6] B. Lee, J. Choi, J. Seol, D. J. Love, and B. Shim, "Antenna Grouping based Feedback Reduction for FDD-based Massive MIMO Systems," in Proc. of IEEE International Conference on Communications, Jun. 2014. 

[7] J. Choi, T. Kim, D. J. Love, and J. Seol, "Exploiting the Preferred Domain of FDD Massive MIMO Systems with Uniform Planar Arrays," in Proc. of IEEE International Conference on Communications, Jun. 2015.

[8] J. Choi, K. Lee, D. J. Love, T. Kim, and R. W. Heath Jr., "Advanced Limited Feedback Designs for FD-MIMO Using Uniform Planar Arrays," in Proc. of IEEE Global Communications Conference, Dec. 2015.

[9] J. Song, J. Choi, and D. J. Love, "Advanced Quantizer Designs for FD-MIMO Systems using Uniform Planar Arrays," in Proc. of IEEE Global Communications Conference, Dec. 2016.

 

[10] J. Choi, D. J. Love, and P. Bidigare, "Downlink Training Techniques for FDD Massive MIMO Systems: Open-Loop and Closed-Loop Training with Memory," IEEE Journal of Selected Topics in Signal Processing, vol. 8, no. 5, pp. 802-814, Oct. 2014 (2015 IEEE Signal Processing Society Best Paper Award).

[11] D. J. Love, J. Choi, and P. Bidigare, "A Closed-Loop Training Approach for Massive MIMO Beamforming Systems," in Proc. of Conference on Information Sciences and Systems, Mar. 2013.

 

[12] J. Choi, J. Mo, and R. W. Heath Jr., "Near Maximum-Likelihood Detector and Channel Estimator for Uplink Multiuser Massive MIMO Systems with One-Bit ADCs," IEEE Transactions on Communications, vol. 64, no. 5, pp. 2005-2018, May 2016.

[13] C. Mollén, J. Choi, E. Larsson, and R. W. Heath Jr., "Uplink Performance of Wideband Massive MIMO With One-Bit ADCs," IEEE Transactions on Wireless Communications, vol. 16, no. 1, pp. 87-100, Jan. 2017.

[14] C. Mollén, J. Choi, E. Larsson, and R. W. Heath Jr., "One-Bit ADCs in Wideband Massive MIMO Systems with OFDM Transmission," in Proc. of IEEE International Conference on Acoustics, Speech and Signal Processing, Mar. 2016.

[15] C. Mollén, J. Choi, E. Larsson, and R. W. Heath Jr., "Performance of Linear Receivers for Wideband Massive MIMO with One-Bit ADCs," in International ITG Workshop on Smart Antennas (WSA 2016), Mar. 2016. 

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