Xianjun Jiao

Xianjun Jiao
Ghent University | UGhent · Department of Information Technology

PhD

About

49
Publications
12,773
Reads
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211
Citations
Citations since 2016
37 Research Items
199 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
November 2014 - present
Apple Inc.
Position
  • Senior iOS RF software engineer
November 2014 - April 2016
Apple Inc.
Position
  • RF software engineer
September 2011 - September 2014
Nokia Research Center
Position
  • Senior Researcher
Description
  • Software Defined Radio; LTE L1 protocol&algorithm; OpenCL; GPGPU; Multi-antenna based Direction Finding algorithm; In-door positioning; BT-SIG standardization activity; Signal Processing system&implementation

Publications

Publications (49)
Article
Full-text available
Private professional environments such as manufacturing industry, warehouses, hospitals, airports, among others, increasingly rely on end-to-end connected solutions to support and to improve their daily operational performance. This comes with a demand for real-time and deterministic communication, without evading the flexibility offered by wireles...
Article
Precision time protocol (PTP), a state-of-the-art clock synchronization protocol primarily designed for wired networks, has recently gained attention in the wireless community, due to the increased use of the IEEE 802.11 wireless local area networks (WLAN) in real-time distributed systems. However, all the existing WLAN-based PTP designs either inc...
Preprint
Full-text available
CSI (Channel State Information) of WiFi systems has become a hot topic in recent years. The information contains the environment channel response between the transmitter and the receiver, so that the people/objects and their movement in between can be detected by analyzing CSI. CSI is the channel estimation result in the receiver based on the pre-k...
Article
Full-text available
Network slicing is one of the key enabling techniques for 5G, allowing network providers to support services with diverging requirements on top of their physical infrastructure. In this article, we address the limited support and oversimplified resource allocation on different network segments of existing end-to-end (E2E) orchestration solutions. W...
Article
Full-text available
Today’s wired networks have become highly flexible, thanks to the fact that an increasing number of functionalities are realized by software rather than dedicated hardware. This trend is still in its early stages for wireless networks, but it has the potential to improve the network’s flexibility and resource utilization regarding both the abundant...
Article
Full-text available
The next generation of wireless and mobile networks will have to handle a significant increase in traffic load compared to the current ones. This situation calls for novel ways to increase the spectral efficiency. Therefore, in this paper, we propose a wireless spectrum hypervisor architecture that abstracts a radio frequency (RF) front-end into a...
Article
Full-text available
DARPA, the Defense Advanced Research Projects Agency from the United States, has started the Spectrum Collaboration Challenge with the aim to encourage research and development of coexistence and collaboration techniques of heterogeneous networks in the same wireless spectrum bands. Team SCATTER has been participating in the challenge since its beg...
Preprint
Full-text available
The next generation of wireless and mobile networks will have to handle a significant increase in traffic load compared to the actual one. This situation calls for novel ways to increase spectral efficiency. Therefore in this paper, we propose a wireless spectrum hypervisor architecture that abstracts a radio frequency (RF) front-end into a configu...
Preprint
Full-text available
DARPA, the Defense Advanced Research Projects Agency from the United States, has started the Spectrum Collaboration Challenge with the aim to encourage research and development of coexistence and collaboration techniques of heterogeneous networks in the same wireless spectrum bands. Team SCATTER has been participating in the challenge since its beg...
Patent
Full-text available
Virtualization is a technology which creates multiple “logical” instances based on one hardware/system/network. It allows for higher resource utilization in a scenario with multiple “users” accessing the same set of resources in the physical world. Some well known virtualization examples are: 1. Multiple instances of a program can be created in a c...
Chapter
This work leverages recent advances in machine learning for radio environment monitoring with context awareness, and uses the obtained information for creating radio slices that can optimally coexist with ongoing traffic in a given spectrum band. We instantiate radio slices as virtualised radios built on a software-defined radio platform. Then, we...
Article
Full-text available
Thanks to the digitization and softwarization of radio communication, the development cycle of new radio technologies can be significantly accelerated by prototyping on software-defined radio (SDR) platforms. However, a slow turnaround time (TT) of the front-end of an SDR for switching from receiving mode to transmitting mode or vice versa, are jeo...
Article
Full-text available
Mobile traffic demand is expected to grow as much as eight-fold in the coming next five years, putting strain in current wireless infrastructures. Meanwhile the diversity of traffic and standards may explode as well. One of the most common means for matching these mounting requirements is through network densification, essentially increasing the de...
Preprint
The explosive emergence of wireless technologies and standards, covering licensed and unlicensed spectrum bands has triggered the appearance of a huge amount of wireless technologies, with many of them coexisting in the same band. Unfortunately, the wireless spectrum is a scarce resource, and the available frequency bands will not scale with the fo...
Article
Full-text available
The explosive emergence of wireless technologies and standards, covering licensed and unlicensed spectrum bands has triggered the appearance of a huge amount of wireless technologies, with many of them competing for the same spectrum band instead of harmoniously sharing it. Unfortunately, the wireless spectrum is a scarce resource, and the availabl...
Preprint
Full-text available
The explosive emergence of wireless technologies and standards, covering licensed and unlicensed spectrum bands has triggered the appearance of a huge amount of wireless technologies, with many of them coexisting in the same band. Unfortunately, the wireless spectrum is a scarce resource, and the available frequency bands will not scale with the fo...
Conference Paper
Full-text available
The explosive emergence of wireless technologies and standards, covering licensed and unlicensed spectrum bands has triggered the appearance of a huge amount of wireless technologies, with many of them coexisting in the same band. Unfortunately, the wireless spectrum is a scarce resource, and the available frequency bands will scale with the forese...
Article
Full-text available
Software-Defined Network (SDN) is a promising architecture for next generation Internet. SDN can achieve Network Function Virtualization much more efficiently than conventional architectures by splitting the data and control planes. Though SDN emerged first in wired network, its wireless counterpart Software-Defined Wireless Network (SDWN) also att...
Chapter
Full-text available
Abstract. Diverse wireless standards, designed for diverse traffic types, operate in the same wireless environment without coordination, often leading to interference and inefficient spectrum usage. Although C-RAN (Cloud/centralized RAN) is a promising architecture to achieve intra-operator network coordination, the architecture encounters challeng...
Conference Paper
Full-text available
Mobile traffic demand is expected to grow as much as eight-fold in the coming next five years, putting strain in current wireless infrastructure. One of the most common means for matching these mounting requirements is through network densification, essentially increasing the density of deployment of operators' base stations. In this paper we take...
Presentation
Full-text available
Slides for this paper: Cellular Access Multi-Tenancy through Small Cell Virtualization and Common RF Front-End Sharing https://dl.acm.org/citation.cfm?id=3131474
Conference Paper
Full-text available
Diverse wireless standards, designed for diverse traffic types, operate in the same wireless environment without coordination, often leading to interference and inefficient spectrum usage. Although C-RAN (Cloud/centralized RAN) is a promising architecture to achieve intra-operator network coordination, the architecture encounters challenge when low...
Conference Paper
Full-text available
The control mechanisms that are provided today in wireless technologies are not adequate to deal with extreme (ultra‐low latency, ultra‐high throughput, ultra‐high reliability) and diverging (low and high data rate, time‐critical and non-time critical) communication needs. Interesting evolutions are happening at different levels that enable the cre...
Conference Paper
Full-text available
To enhance system performance of future heterogeneous wireless networks the co-design of PHY, MAC, and higher layer protocols is inevitable. In this work, we present WiSCoP - a novel embedded platform for experimentation, prototyping and implementation of integrated cross-layer network design approaches. WiSCoP is built on top of a Zynq hardware pl...
Article
Wireless network deployments in industry often grow organically with new technologies added over time, among which many use the non-licensed spectrum to avoid licensing costs. As a result, technologies competing for the same spectrum end up deployed in the same area, causing coexistence problems to manifest themselves at a later stage. To avoid une...
Technical Report
Full-text available
While SDR and SDN initially were parallel evolutions happening in isolated research communities, several European projects, more specifically the H2020 projects WiSHFUL, eWINE and ORCA are currently developing enablers to bridge the gap between SDR and SDN. These projects offer advanced software and hardware platforms in open state-of-the-art large...
Conference Paper
Full-text available
A standard-throughput-approaching LDPC decoder has been implemented on a mid-range GPU in this paper. Turbo-Decoding Message-Passing algorithm is applied to achieve high throughput. Different from traditional host managed multi-streams to hide host-device transfer delay, we use kernel maintained data transfer scheme to achieve implicit data transfe...
Conference Paper
Full-text available
In this paper we propose an approach to 3-D ambiguity (type I ambiguity [l]) analysis of arbitrary antenna arrays. Ambiguity characterization is very important in designing antenna array for direction finding in mobile communications/indoor positioning/radar, which greatly influences practical capability of Direction of Arrival (DOA) estimation. Co...
Conference Paper
Turbo codes were developed by Claude Berrou in 1993, which were based on convolutional codes and Viterbi algorithm and could closely approach the channel capacity. Software Defined Radio (SDR) promises to revolutionize the communication industry by delivering low-cost, flexible software solutions. Graphics Processing Units (GPUs) offer unprecedente...
Conference Paper
The research of terminal baseband processing reconfiguration has become the trend of software-defined radio (SDR) which achieves flexibility in an environment with different standards. Transport triggered architecture (TTA) is an ideal processor template for ASIP with customized datapath but without the inflexibility and design cost of fixed functi...
Conference Paper
Full-text available
Turbo coding is commonly used in the current wireless standards such as 3G and 4G. However, due to the high computational requirements, its software-defined implementation is challenging. This paper proposes a static multi-issue exposed datapath processor design tailored for turbo decoding. In order to utilize the parallel processor datapath effici...
Conference Paper
Full-text available
Parallel implementations of Turbo decoding has been studied extensively. Traditionally, the number of parallel sub-decoders is limited to maintain acceptable code block error rate performance loss caused by the edge effect of code block division. In addition, the sub-decoders require synchronization to exchange information in the iterative process....
Article
Full-text available
The lack of an effective debugging tool has become a serious constraint to the development of TTA and TCE. In this paper we analyze in depth the requirements of debugging a TTA processor and then present a relatively perfect debugging system which can meet the requirements well. Design details of hardware and software are introduced later on. At la...
Conference Paper
Full-text available
Complex low-density lattice codes (LDLC) designed via spatial coupling for inter-symbol interference (ISI) channels are proposed in this paper. A complex node-by-node belief propagation (BP) decoding algorithm is derived. To improve the BP threshold lattice codes are directly constructed in the Euclidean space via spatial coupling technique. A semi...
Conference Paper
Full-text available
Turbo codes are widely used in many communication systems, and decoding algorithm is studied intensively. Most decoding algorithms are Max-Log-MAP based, which performs arithmetic computation in logarithm domain. In recent years, stochastic turbo decoding has been proposed as a potential high parallel scheme. Stochastic decoding is carried on in pr...
Conference Paper
Full-text available
We propose a Time-Domain Equalization (TDE) algorithm for Cyclic Prefixing - Orthogonal Frequency Division Multiplexing (CP-OFDM) signal. Because TDE is together with Interference Cancelling (IC), we call the scheme “CP-OFDM-IC-TDE”. OFDM with TDE appeared in Zero Padding - OFDM (ZP-OFDM) originally to avoid frequency-domain zero locations, and our...
Article
Full-text available
A new postfixing scheme for orthogonal frequency division multiplexing (OFDM) systems is proposed. Corresponding channel estimation (CE) and symbol recovery (SR) algorithms are also proposed. Numerical results reveal that the new scheme has lower bit error rate (BER) than CP/ZP-OFDM (zero padding/cyclic prefixing OFDM) when channel state informatio...

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Projects

Projects (2)
Project
The DARPA Spectrum Collaboration Challenge (SC2) is the first-of-its-kind collaborative machine-learning competition to overcome scarcity in the radio frequency (RF) spectrum. Today, spectrum is managed by dividing it into rigid, exclusively licensed bands. This human-driven process is not adaptive to the dynamics of supply and demand, and thus cannot exploit the full potential capacity of the spectrum. In SC2, competitors will reimagine a new, more efficient wireless paradigm in which radio networks autonomously collaborate to dynamically determine how the spectrum should be used moment to moment.