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Your search keyword '"Zhong, Caijun"' showing total 34 results
Start Over Author "Zhong, Caijun" Journal ieee transactions on communications
34 results on '"Zhong, Caijun"'

3. Self-Adaptive Measurement Matrix Design and Channel Estimation in Time-Varying Hybrid MmWave Massive MIMO-OFDM Systems

Author

Lin, Chenlan, Gao, Jiabao, Jin, Richeng, and Zhong, Caijun

Abstract

Channel estimation in hybrid massive multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is challenging as only low-dimensional channel measurement can be obtained at the receiver while the true channel is high-dimensional. In the compressed sensing (CS) based channel estimation algorithms, a well-designed measurement matrix will contribute to better estimation performance. Therefore, a temporal correlation-based self-adaptive measurement matrix design (TC-SAMMD) method is proposed, and the corresponding frame structure and channel estimation technique are developed in this paper. Specifically, pilots are transmitted twice during each block, and the process of channel estimation contains three steps: time-varying channel estimation by Kalman filtering, self-adaptive measurement matrix design, and two pilots-based channel estimation via the simultaneous orthogonal matching pursuit (SOMP) algorithm. Simulation results demonstrate that the proposed TC-SAMMD method outperforms conventional measurement matrix design approaches in terms of the channel estimation error, thanks to the “adaptiveness” to the channel’s characteristics in consecutive blocks. Besides, it is shown that the TC-SAMMD strategy with a full-ranged innovation noise can effectively mitigate the performance degradation caused by the angle shifts.

Published
2024
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13. MIMO Rayleigh-product channels with co-channel interference

Author

Zhong, Caijun, Jin, Shi, and Wong, Kai-Kit

Subjects
Monte Carlo method -- Usage, Fading channels -- Evaluation, MIMO communications -- Methods, Electromagnetic interference -- Control, Electromagnetic waves -- Scattering, Electromagnetic waves -- Methods
Abstract

This paper presents an analytical performance investigation of an interference-limited double scattering multiple-input multiple-output (MIMO) channel employing optimum combining. Our main contribution is the derivation of the closed-form expressions for the cumulative distribution function (c.d.f.) and probability density function (p.d.f.) of the maximum eigenvalue of the resultant channel matrix after optimal combining when the transmit, receive and scattering correlation matrices are identities (hence, the channel is referred to as a Rayleigh-product channel). These results allow us to obtain the outage probability of the optimal combining system in a Rayleigh-product channel with co-channel interferences. Furthermore, we investigate, in depth, an important special case of double scattering channel, the keyhole channel, where based on various closed-form expressions for exact and asymptotic measures derived, we examine three key performance metrics, namely, the ergodic capacity, the outage performance and the symbol-error-rate (SER). The analytical results derived are validated by Monte-Carlo simulations. Index Terms--Double scattering, fading channels, MIMO systems, optimum combining, performance analysis.

Published
2009

34. Ergodic Capacity Comparison of Different Relay Precoding Schemes in Dual-Hop AF Systems With Co-Channel Interference.

Author

Zhu, Guangxu, Zhong, Caijun, Suraweera, Himal A., Zhang, Zhaoyang, Yuen, Chau, and Yin, Rui

Subjects
*INTERFERENCE (Telecommunication), *CODING theory, *RELAY control systems, *HEURISTIC algorithms, *ADDITIVE white Gaussian noise channels
Abstract

In this paper, we analyze the ergodic capacity of a dual-hop amplify-and-forward relaying system, where the relay is equipped with multiple antennas and subject to co-channel interference and the additive white Gaussian noise. Specifically, we consider three heuristic precoding schemes, where the relay first applies the: 1) maximal-ratio combining (MRC); 2) zero-forcing (ZF); and 3) minimum mean-squared error (MMSE) principle to combine the signal from the source, and then steers the transformed signal toward the destination with the maximum ratio transmission (MRT) technique. For the MRC/MRT and MMSE/MRT schemes, we present new tight analytical upper and lower bounds for the ergodic capacity, while for the ZF/MRT scheme, we derive a new exact analytical ergodic capacity expression. Moreover, we make a comparison among all three schemes, and our results reveal that, in terms of the ergodic capacity performance, the MMSE/MRT scheme always has the best performance and the ZF/MRT scheme is slightly inferior, while the MRC/MRT scheme is always the worst one. Finally, the asymptotic behavior of ergodic capacity for the three proposed schemes are characterized in large $N$ scenario, where $N$ is the number of relay antennas. Our results reveal that, in the large $N$ regime, both the ZF/MRT and MMSE/MRT schemes have perfect interference cancelation capability, which is not possible with the MRC/MRT scheme. [ABSTRACT FROM AUTHOR]

Published
2014
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