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Research at Communication Systems

Current projects led by the Division of Communication Systems

  • Very Large MIMO Systems (ICT rambidrag)
    • Funded by: Swedish Research Council (VR) (2011-2014)
    • Project leader: Prof. Erik G. Larsson. Partners: Prof. Mikael Skoglund, KTH and Dr. Fredrik Tufvesson, Lund Univ.
    • Project summary: This project deals with coding, signal processing and radio propagation aspects of very large MIMO arrays. See here for more detail on this topic: very large MIMO website
    • Large MIMO Systems for High Throughput Reliable and Power-Efficient Wireless Communication
  • Spectrally efficient and robust future generation radio.
    • Funded by: Swedish Foundation of Strategic Research (SSF) (2008-2013)
    • Project leader: Prof. Erik G. Larsson
    • Project summary: The goal of this project is to develop new paradigms for efficient spectrum and power utilization in wireless communication networks. Two interrelated topics form the focus. Under the first, we are concerned with coordinating different multiple-antenna wireless systems (operators) that operate and compete for resources in the same unlicensed spectral band. The goals are to understand fundamental limits; to develop algorithms and protocols for resolution of spectrum conflicts; and as a bonus, to obtain a general understandi ng that can serve as input to standardization and spectrum regulation processes. The motivation for this task is the increased interest in unlicensed operation, and the coexistence problems currently faced in such spectrum bands. Our research stands out in that we focus on multiple-antenna technology, and in that our focus is on solving resource conflicts via collaborative techniques.

      The second direction concerns cognitive radio technology. Essentially, cognitive radio is a way of mixing licensed and unlicensed operation in the same spectral band. The proposed work consists of system and feasibility studies, and of algorithm development for spectrum sensing. An additional goal is to characterize the nature of the interference experienced in an environment where cognitive radio operation is permitted, and to develop communication receivers which are robust to this type of interference.
  • Improved retransmission schemes for OFDM-based mobile broadband systems

EU FP7 projects where we are partner

  • Sharing Physical Resources - Mechanisms and Implementations for Wireless Networks (SAPHYRE)
    • Funded by: EU FP7 (2010-2012)
      STREP project; Coordinator: Technical University of Dresden, Germany
    • Project leader at LiU: Prof. Erik G. Larsson . Work package leader is Eleftherios Karipidis.
    • Project webpage
    • Project summary: In current wireless communications, radio spectrum and infrastructure are typically used such that interference is avoided by exclusive allocation of frequency bands and employment of base stations. SAPHYRE will demonstrate how equal-priority resource sharing in wireless networks improves spectral efficiency, enhances coverage, increases user satisfaction, leads to increased revenue for operators, and decreases capital and operating expenditures.
       
      SAPHYRE represents a consortium that spans the entire chain from spectrum regulatory aspects, networking, physical layer to hardware implementation. The vision of SAPHYRE is to:
      1. show how voluntary sharing of physical and infrastructure resources enables a fundamental, order-of-magnitude-gain in the efficiency of spectrum utilisation;
      2. develop the enabling technology that facilitates such voluntary sharing;
      3. determine the key features of a regulatory framework that underpins and promotes such voluntary sharing.
      SAPHYRE’s main objectives are conceptually described as:
      1. SAPHYRE analyses and develops new self-organising physical layer resource (spectrum, spatial coexistence) sharing models by a generalised cross-layer and cross-disciplinary approach.
      2. SAPHYRE proposes and analyses efficient co-ordination mechanisms which require only small intervention (to counteract selfish, malicious users). In particular in sharing scenarios, incentive based design is applied in order to reduce regulatory complexity.
      3. SAPHYRE develops a framework for infrastructure sharing to support quality of service with sufficiently wide carrier bandwidths and competition between different operators.
  • Achieving Low-Latency in Wireless Communications (LOLA)
    • Funded by: EU FP7 (2010-2012)
      STREP project; Coordinator: EURECOM, France
    • Project leader at LiU: Prof. Erik G. Larsson . Work package leader is Danyo Danev.
    • Project webpage
    • Project summary: The focus of LOLA is on access-layer technologies targeting low-latency robust and spectrally-efficient transmission in a set of emerging application scenarios. We consider two basic types of wireless networks, namely long-range LTE-Advanced Cellular Networks and medium-range rapidly-deployable mesh networks. Research on low-latency transmission in cellular networks is focused firstly on transmission technologies in support of gaming services which will undoubtedly prove to be a strategic revenue area for operators in the years to come. Secondly, we also consider machine-to machine (M2M) applications in mobile environments using sensors connected to public infrastructure (in trains, busses, train stations, utility metering, etc.). M2M is an application area of extremely high growth potential in the context of future LTE-Advanced networks. A primary focus of the M2M research is to provide recommendations regarding PHY/MAC procedures in support of M2M to the 3GPP standardization process. The rapidly-deployable mesh topology component addresses M2M applications such as remote control and personnel/fleet tracking envisaged for future broadband civil protection networks. This work builds upon ongoing European research in this important area. Fundamental aspects of low-latency transmission are considered in addition to validation on real-time prototypes for s subset of the considered application scenarios. The cellular scenario validation is carried out using both live measurements from an HSPA test cell coupled with large-scale real-time emulation using the OpenAirInterface.org emulator for both high-performance gaming and M2M application. In addition, a validation testbed for low-layer (PHY/MAC) low latency procedures will be developed. The rapidly deployable wireless mesh scenario validation makes use of the real-time OpenAirInterface.org RF platform and the existing FP6 CHORIST demonstrator interconnected with commercial M2M equipment.

Nationally funded projects where we are partner


Sidansvarig: Erik G. Larsson
Senast uppdaterad: 2013 05 17   23:56