Now showing items 1-20 of 254

    • High-Throughput Data Detection for Massive MU-MIMO-OFDM Using Coordinate Descent 

      Wu, Michael; Dick, Chris; Cavallaro, Joseph R.; Studer, Christoph (2016)
      Data detection in massive multi-user (MU) multiple-input multiple-output (MIMO) wireless systems is among the most critical tasks due to the excessively high implementation complexity. In this paper, we propose a novel, ...
    • Decision-Directed Channel Estimation Implementation for Spectral Efficiency Improvement in Mobile MIMO-OFDM 

      Ketonen, Johanna; Juntti, Markku; Ylioinas, Jari; Cavallaro, Joseph R. (2015)
      Channel estimation algorithms and their implementations for mobile receivers are considered in this paper. The 3GPP long term evolution (LTE) based pilot structure is used as a benchmark in a multiple-input multiple-o ...
    • Dataflow Modeling and Design for Cognitive Radio Networks 

      Wang, Lai-Huei; Bhattacharyya, Shuvra S.; Vosoughi, Aida; Cavallaro, Joseph R.; Juntti, Markku; Boutellier, Jani; Silven, Olli; Valkama, Mikko (2013-10-01)
      Cognitive radio networks present challenges at many levels of design including configuration, control, and crosslayer optimization. In this paper, we focus primarily on dataflow representations to enable flexibility and ...
    • Highly Scalable On-the-Fly Interleaved Address Generation for UMTS/HSPA+ Parallel Turbo Decoder 

      Vosoughi, Aida; Wang, Guohui; Shen, Hao; Cavallaro, Joseph R.; Guo, Yuanbin (2013-06-01)
      High throughput parallel interleaver design is a major challenge in designing parallel turbo decoders that conform to high data rate requirements of advanced standards such as HSPA+. The hardware complexity of the HSPA+ ...
    • A Fast and Efficient Sift Detector Using The Mobile GPU 

      Rister, Blaine; Wang, Guohui; Wu, Michael; Cavallaro, Joseph R. (2013-06)
      Emerging mobile applications, such as augmented reality, demand robust feature detection at high frame rates. We present an implementation of the popular Scale-Invariant Feature Transform (SIFT) feature detection algorithm ...
    • Implementation Trade-Offs For Linear Detection In Large-Scale MIMO Systems 

      Yin, Bei; Wu, Michael; Studer, Christoph; Cavallaro, Joseph R.; Dick, Chris (2013-06)
      In this paper, we analyze the VLSI implementation tradeoffs for linear data detection in the uplink of large-scale multiple-input multiple-output (MIMO) wireless systems. Specifically, we analyze the error incurred by ...
    • Accelerating Computer Vision Algorithms Using OpenCL Framework on Mobile Devices - A Case Study 

      Wang, Guohui; Xiong, Y.; Yun, Jay; Cavallaro, Joseph R. (2013-06)
      Recently, general-purpose computing on graphics processing units (GPGPU) has been enabled on mobile devices thanks to the emerging heterogeneous programming models such as OpenCL. The capability of GPGPU on mobile devices ...
    • Approximate Matrix Inversion for High-Throughput Data Detection in Large-Scale MIMO Uplink 

      Wu, M.; Yin, B.; Vosoughi, A.; Studer, C.; Cavallaro, Joseph R.; Dick, C. (2013-05)
      The high processing complexity of data detection in the large-scale multiple-input multiple-output (MIMO) uplink necessitates high-throughput VLSI implementations. In this paper, we propose—to the best of our knowledge—first ...
    • Parallel Interleaver Architecture with New Scheduling Scheme for High Throughput Configurable Turbo Decoder 

      Wang, Guohui; Vosoughi, Aida; Shen, Hao; Cavallaro, Joseph R.; Guo, Yuanbin (2013-05)
      Parallel architecture is required for high throughput turbo decoder to meet the data rate requirements of the emerging wireless communication systems. However, due to the severe memory conflict problem caused by parallel ...
    • GPU-based Acceleration of Symbol Timng Recovery 

      Kim, Scott C.; Plishker, William L.; Bhattacharyya, Shurva S.; Cavallaro, Joseph R. (2012-12-20)
      This paper presents a novel implementation of graphics processing unit (GPU) based symbol timing recovery using polyphase interpolators to detect symbol timing error. Symbol timing recovery is a compute intensive procedure ...
    • Low Complexity Opportunistic Decoder for Network Coding 

      Yin, Bei; Wu, Michael; Wang, Guohui; Cavallaro, Joseph R. (2012-12-01)
      In this paper, we propose a novel opportunistic decoding scheme for network coding decoder which significantly reduces the decoder complexity and increases the throughput. Network coding was proposed to improve the ...
    • Baseband Signal Compression in Wireless Base Stations 

      Vosoughi, Aida; Wu, Michael; Cavallaro, Joseph R. (2012-12-01)
      To comply with the evolving wireless standards, base stations must provide greater data rates over the serial data link between base station processor and RF unit. This link is especially important in distributed antenna ...
    • Implementation of LS, MMSE and SAGE Channel Estimators for Mobile MIMO-OFDM 

      Ketonen, Johanna; Juntti, Markku; Ylioinas, Jari; Cavallaro, Joseph R. (2012-12-01)
      The use of decision directed (DD) channel estimation in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) downlink receiver is studied in this paper. The 3GPP long term evolution ...
    • Parallel Nonbinary LDPC Decoding on GPU 

      Wang, Guohui; Shen, Hao; Yin, Bei; Wu, Michael; Sun, Yang; Cavallaro, Joseph R. (2012-12-01)
      Nonbinary Low-Density Parity-Check (LDPC) codes are a class of error-correcting codes constructed over the Galois field GF(q) for q > 2. As extensions of binary LDPC codes, nonbinary LDPC codes can provide better ...
    • LTE uplink MIMO receiver with low complexity interference cancellation 

      Yin, Bei; Cavallaro, Joseph R. (2012-11-01)
      In LTE/LTE-A uplink receiver, frequency domain equalizers (FDE) are adopted to achieve good performance. However, in multi-tap channels, the residual inter-symbol and inter-antenna interference still exist after FDE ...
    • Flexible N-Way MIMO Detector on GPU 

      Wu, Michael; Yin, Bei; Cavallaro, Joseph R. (2012-10-17)
      This paper proposes a flexible Multiple-Input Multiple-Output (MIMO) detector on graphics processing units (GPU). MIMO detection is a key technology in broadband wireless system such as LTE,WiMAX, and 802.11n. Existing ...
    • Data Compression in Base Transceiver Systems 

      Vosoughi, Aida; Cavallaro, Joseph R.; Wu, Michael (2012-10)
    • High-Level Design Tools for Complex DSP Applications 

      Sun, Yang; Amiri, Kiarash; Wang, Guohui; Yin, Bei; Cavallaro, Joseph R.; Ly, Tai (2012-07-12)
      High-level synthesis design methodology - High level synthesis (HLS) [1], also known as behavioral synthesis and algorithmic synthesis, is a design process in which a high level, functional description of a design is ...
    • FPGA in Wireless Communications Applications 

      Amiri, Kiarash; Duarte, Melissa; Cavallaro, Joseph R.; Dick, Chris; Rao, Raghu; Sabharwal, Ashutosh (2012-07-12)
      In the past decade we have witnessed explosive growth in the wireless communications industry with over 4 billion subscribers worldwide. While first and second generation systems focused on voice communications, third ...
    • Low complexity scalable MIMO sphere detection through antenna detection reordering 

      Wu, Michael; Dick, Chris; Sun, Yang; Cavallaro, Joseph R. (2012-07-01)
      This paper describes a novel low complexity scalable multiple-input multiple-output (MIMO) detector that does not require preprocessing and the optimal squared l2-norm computations to achieve good bit error (BER) performance. ...