Now showing items 1-20 of 268

  • 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 ...
  • Decision-Directed Channel Estimation Implementation for Spectral Efficiency Improvement in Mobile MIMO-OFDM 

    Ketonen, Johanna; Juntti, Markku; Ylioinas, Jari; Cavallaro, Joseph R. (2013-09-30)
    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 ...
  • 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+ ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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. ...
  • High-Throughput Soft-Output MIMO Detector Based on Path-Preserving Trellis-Search Algorithm 

    Sun, Yang; Cavallaro, Joseph R. (2012-07-01)
    In this paper, we propose a novel path-preserving trellis-search (PPTS) algorithm and its high-speed VLSI architecture for soft-output multiple-input-multiple-output (MIMO) detection. We represent the search space of the ...
  • Parallel Searching-Based Sphere Detector for MIMO Downlink OFDM Systems 

    Radosavljevic, Predrag; Kim, Kyeong Jin; Shen, Hao; Cavallaro, Joseph R. (2012-06-01)
    In this paper, implementation of a detector with parallel partial candidate-search algorithm is described. Two fully independent partial candidate search processes are simultaneously employed for two groups of transmit ...
  • Reconfigurable Multi-Standard Uplink MIMO Receiver with Partial Interference Cancellation 

    Yin, Bei; Amiri, Kiarash; Cavallaro, Joseph R.; Guo, Yuanbin (2012-06-01)
    As HSPA/HSPA+ and LTE/LTE-A evolve in parallel, the reconfigurability of a receiver to support multiple standards has become more and more important, especially for small cells. In this paper, we first suggest a reconfigurable ...
  • Trellis-Search Based Soft-Input Soft-Output MIMO Detector: Algorithm and VLSI Architecture 

    Sun, Yang; Cavallaro, Joseph R. (2012-05-01)
    In this paper, we propose a trellis-search based soft-input soft-output detection algorithm and its very large scale integration (VLSI) architecture for iterative multiple-input multiple-output (MIMO) receivers. We construct ...
  • Improving MIMO Sphere Detection Through Antenna Detection Order Scheduling 

    Wu, Michael; Dick, Chris; Cavallaro, Joseph R. (2011-12-01)
    This paper proposes a novel scalable Multiple-Input Multiple-Output (MIMO) detector that does not require preprocessing to achieve good bit error rate (BER) performance. MIMO processing is a key technology in broadband ...
  • Low complexity MMSE based interference cancellation for LTE uplink MIMO receiver 

    Yin, Bei; Cavallaro, Joseph R. (2011-12-01)
    In this paper, we propose a novel low complexity minimum mean square error (MMSE) interference cancellation (IC) to minimize the residual inter-symbol and inter-antenna interference in LTE/LTE-Advanced uplink. In the ...
  • Implementation of a High Throughput 3GPP Turbo Decoder on GPU 

    Wu, Michael; Sun, Yang; Wang, Guohui; Cavallaro, Joseph R. (2011-11-01)
    Turbo code is a computationally intensive channel code that is widely used in current and upcoming wireless standards. General-purpose graphics processor unit (GPGPU) is a programmable commodity processor that achieves ...
  • GPU Accelerated Scalable Parallel Decoding of LDPC Codes 

    Wang, Guohui; Wu, Michael; Sun, Yang (2011-11-01)
    This paper proposes a flexible low-density parity-check (LDPC) decoder which leverages graphic processor units (GPU) to provide high decoding throughput. LDPC codes are widely adopted by the new emerging standards for ...