Zhi Ding | University of California, Davis (original) (raw)

Address: Davis, CA, USA

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Papers by Zhi Ding

IEEE Internet of Things Journal

In recent release of the new cellular standard known as 5G New Radio (5G-NR), the physical downli... more In recent release of the new cellular standard known as 5G New Radio (5G-NR), the physical downlink control channel (PDCCH) has adopted polar codes for error protection. Similar to 4G-LTE, each active user equipment (UE) must blindly detect its own PDCCH in the downlink search space. This work investigates new ways to improve the accuracy of PDCCH blind detection in 5G-NR. We develop a novel design of joint detection and decoding receiver for 5G multiple-input multiple-output (MIMO) transceivers. We aim to achieve robustness against practical obstacles including channel state information (CSI) errors, noise, co-channel interferences, and pilot contamination. To optimize the overall receiver performance in PDCCH blind detection, we incorporate the polar code information during the signal detection stage by relaxing and transforming the Galois field code constraints into the complex signal field. Specifically, we develop a novel joint linear programming (LP) formulation that takes int...

IEEE Transactions on Communications

IEEE Transactions on Wireless Communications

IEEE Transactions on Signal Processing

Blind identification of discrete non-minimum phase FIR channels is studied here. Exploiting highe... more Blind identification of discrete non-minimum phase FIR channels is studied here. Exploiting higher order statistics of the unknown channel output, a closed-form solution to the FIR channel impulse response is presented. The algorithm is simple and relies only on nullspace decomposition. It does not involve global minimization of non-unimodal cost functions nor does it use overparametrization. Its application is broad. It can be used either as the final channel estimate or as a good initial point in nonlinear cumulant matching techniques

... These semiblind methods can overcome some serious limitations of SOS blind algorithms. We als... more ... These semiblind methods can overcome some serious limitations of SOS blind algorithms. We also analyze the semi-blind identifiability conditions. Finally, we compare simulation results for GSM receivers using both pure training and semiblind channel identification methods. ...

IEEE Signal Processing Letters, 1996

Several works on blind channel identification and equalization rely on a system model with multip... more Several works on blind channel identification and equalization rely on a system model with multiple sub-channels driven by a single input. These methods depend on a critical condition that no common zero exists among the sub-channels. We aimed at establishing the physical significance of this critical zero condition and understanding the limitation of methods based on second-order statistics, By deriving a number of sufficient conditions, we characterize several classes of band-limited channels that are not identifiable from only the second-order statistics of the channel output.

$Research paper thumbnail of Global convergence of fractionally spaced Godard (CMA) adaptive equalizers$