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Article
Impulse Noise Suppression by Deep Learning-Based Receivers in OFDM Systems
Orthogonal Frequency Division Multiplexing (OFDM) systems are prone to signal corruption caused by strong and frequent impulses, which can be further exacerbated by multipath fading. Recent evolutions highligh...
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Article
Reduced Complexity Hybrid Beamforming for Time-Varying Channels in Millimeter Wave MIMO Systems
Millimeter wave (mmWave) communication and multiple-input multiple-output (MIMO) are two important technologies for future communication systems. Hybrid precoding and combining have been used to reduce the cos...
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Article
Deep Learning Based Decoding for Polar Codes in Markov Gaussian Memory Impulse Noise Channels
In previous papers, decoding schemes which did not use machine learning considered additive white Gaussian noise or memoryless impulse noise. The decoding methods applying deep learning to reduce computational...
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Article
Open AccessMaximum likelihood-based adaptive iteration algorithm design for joint CFO and channel estimation in MIMO-OFDM systems
In this paper, we present a joint time-variant carrier frequency offset (CFO) and frequency-selective channel response estimation scheme for multiple input-multiple output-orthogonal frequency-division multipl...
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Article
Low Complexity User Selection and Power Allocation for Uplink NOMA Beamforming Systems
In this paper, we develop user selection and power allocation methods for NOMA systems equipped with multi-antenna to enhance the sum capacity of the uplink. The system has the base station (BS) with \( N \)N ant...
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Article
Cross Layer Power Control and User Pairing for DL Multi-antenna NOMA
In a previous study, Kim et al. proposed a suboptimal user pairing and optimal power control algorithm for maximizing sum capacity in downlink multi-antenna non-orthogonal multiple access (NOMA) systems. First...
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Article
A Resource Allocation Scheme with Fractional Frequency Reuse in Multi-cell OFDMA Systems
In this paper, a resource allocation scheme is proposed for multi-cell OFDMA systems in downlink under the fractional frequency reuse environments. The objective considers balancing between the maximization of...
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Article
Cross Layer 1, 2 and 5 Resource Allocation in Uplink Turbo-coded HARQ Based OFDMA Video Transmission Systems
Wang et al. propose the cross layer resource allocation algorithm considering channel state information in layer 1 and rate-distortion function in layer 5, for uplink convolutional coded OFDMA video transmissi...
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Article
Utilization of spatial ternary coding scheme in optical CDMA system
In this paper, we propose a spatial ternary coding scheme for optical code-division multiple access systems. Since the multiple access interference (MAI) and beat noise leads to the error floor effect, using e...
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Article
Distributed Orthogonal and Quasi-Orthogonal Space-Time Block Code with Embedded AAF/DAF Matrix Elements in Wireless Relay Networks with Four Relays
We consider cooperative networks of one source, four relays, and one destination. Each of them has a single antenna. The four relays use a proposed full rate distributed quasi orthogonal space time block code ...
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Chapter and Conference Paper
Software Baseband Optimization Except Channel Decoding for PC-Based DVB-T Software Radio Receiver
The software radio has the advantages of flexibility, low cost and multimode ability, but the major disadvantage is the slower speed. To increase the speed of PC-based software DVB-T receiver, we need implemen...
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Article
Throughput Analysis of DS CDMA/Unslotted ALOHA Wireless Networks with Fixed Packet Length in Rayleigh Fading Finite-State Markov Channel Model
We propose the finite-state Markov channel (FSMC) model to the throughput analysis of DS CDMA/unslotted ALOHA wireless networks in the mobile environment. The FSMC model can characterize the correlation struct...
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Article
Iterative Channel Decoding for PC-Based Software Radio DVB-T Receiver
The previous scheme only modifies the Viterbi decoder input positions where the Reed-Solomon decoder makes sure they are correct. Although it is simple and can get perfect image quality in static channels, it ...
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Article
Simpler Throughput Analysis of CDMA/Unslotted ALOHA Radio Networks with Variable Message Length Based on M/M/inf Queueing Model
We propose a new and exact method to analyze the throughput of the DS CDMA unslotted ALOHA system with variable number of fixed-length packets. The proposed scheme requires two-dimensional summation while the ...
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Article
Vector Channel Estimation and Multiuser Detection for Multicarrier DS CDMA in Time and Frequency Selective Fading Channels
In a multicarrier direct-sequence code-division multiple access (MC DS CDMA) system, different fading channels for different users and/or different carriers are correlated in general; thus a vector channel mod...