Now showing items 21-40 of 268

  • Cooperative Partial Detection Using MIMO Relays 

    Amiri, Kiarash; Wu, Michael; Cavallaro, Joseph R.; Lilleberg, Jorma (2011-10-01)
    Using multiple-input multiple-output (MIMO) relays in cooperative communication improves the data rate and reliability of the communication. The MIMO transmission, however, requires considerable resources for the detection ...
  • High-Throughput Contention-Free Concurrent Interleaver Architecture for Multi-Standard Turbo Decoder 

    Wang, Guohui; Sun, Yang; Cavallaro, Joseph R.; Guo, Yuanbin (2011-09-01)
    To meet the higher data rate requirement of emerging wireless communication technology, numerous parallel turbo decoder architectures have been developed. However, the interleaver has become a major bottleneck that limits ...
  • Efficient hardware implementation of a highly-parallel 3GPP LTE/LTE-advance turbo decoder 

    Sun, Yang; Cavallaro, Joseph R. (2011-09-01)
    We present an efficient VLSI architecture for 3GPP LTE/LTE-Advance Turbo decoder by utilizing the algebraic-geometric properties of the quadratic permutation polynomial (QPP) interleaver. The high throughput 3GPP LTE/LTE-Advance ...
  • A Flexible LDPC/Turbo Decoder Architecture 

    Sun, Yang; Cavallaro, Joseph R. (2011-07-01)
    Low-density parity-check (LDPC) codes and convolutional Turbo codes are two of the most powerful error correcting codes that are widely used in modern communication systems. In a multi-mode baseband receiver, both LDPC ...
  • Implementation of a High Throughput Soft MIMO Detector on GPU 

    Wu, Michael; Sun, Yang; Gupta, Siddharth; Cavallaro, Joseph R. (2011-07-01)
    Multiple-input multiple-output (MIMO) significantly increases the throughput of a communication system by employing multiple antennas at the transmitter and the receiver. To extract maximum performance from a MIMO system, ...
  • A Massively Parallel Implementation of QC-LDPC Decoder on GPU 

    Wang, Guohui; Wu, Michael; Sun, Yang; Cavallaro, Joseph R. (2011-06-01)
    The graphics processor unit (GPU) is able to provide a low-cost and flexible software-based multi-core architecture for high performance computing. However, it is still very challenging to efficiently map the real-world ...
  • Architecture Design and Implementation of the Metric First List Sphere Detector Algorithm 

    Myllylä, Markus; Cavallaro, Joseph R.; Juntti, Markku (2011-05-01)
    Soft-output detection of a multiple-input–multiple-output (MIMO) signal pose a significant challenge in future wireless systems. In this paper, we introduce a soft-output modified metric first (MMF)-LSD algorithm for MIMO ...
  • Multi-Layer Parallel Decoding Algorithm and VLSI Architecture for Quasi-Cyclic LDPC Codes 

    Sun, Yang; Wang, Guohui; Cavallaro, Joseph R. (2011-05-01)
    We propose a multi-layer parallel decoding algorithm and VLSI architecture for decoding of structured quasi-cyclic low-density parity-check codes. In the conventional layered decoding algorithm, the block-rows of the parity ...
  • A High Throughput Configurable SDR Detector for Multi-user MIMO Wireless Systems 

    Amiri, Kiarash; Cavallaro, Joseph R.; Dick, Chris; Rao, Raghu Mysore (2011-02-01)
    Spatial division multiplexing (SDM) in MIMO technology significantly increases the spectral efficiency, and hence capacity, of a wireless communication system: it is a core component of the next generation wireless systems, ...
  • Reduced Complexity Soft MMSE MIMO Detector Architecture 

    Amiri, Kiarash; Dick, Chris; Rao, Raghu; Cavallaro, Joseph R. (2010-12-01)
    Computing the soft LLR values in MMSE receivers of MIMO systems requires a very large complexity. In this paper, we propose a reduced complexity soft MMSE detector for MIMO systems. We use different complexity reductions ...
  • Implementation aspects of list sphere decoder algorithms for MIMO-OFDM systems 

    Myllylä, Markus; Cavallaro, Joseph R.; Juntti, Markku (2010-10-01)
    A list sphere decoder (LSD) can be used to approximate the optimal maximum a posteriori (MAP) detector for the detection of multiple-input multiple-output (MIMO) signals. In this paper, we consider two LSD algorithms with ...
  • Implementation of a 3GPP LTE Turbo Decoder Accelerator on GPU 

    Wu, Michael; Cavallaro, Joseph R. (2010-10-01)
    This paper presents a 3GPP LTE compliant turbo decoder accelerator on GPU. The challenge of implementing a turbo decoder is finding an efficient mapping of the decoder algorithm on GPU, e.g. finding a good way to parallelize ...
  • Performance - Complexity Comparison of Receivers for a LTE MIMO–OFDM System 

    Ketonen, Johanna; Juntti, Markku; Cavallaro, Joseph R. (2010-06-01)
    Implementation of receivers for spatial multiplexing multiple-input multiple-output (MIMO) orthogonal-frequency-division-multiplexing (OFDM) systems is considered. The linear minimum mean-square error (LMMSE) and the K-best ...
  • Architectures for Cognitive Radio Testbeds and Demonstrators – An Overview 

    Gustafsson, Oscar; Amiri, Kiarash; Andersson, Dennis; Blad, Anton; Bonner, Christian; Cavallaro, Joseph R.; Declerck, Jeroen; Dejonghe, Antoine; Eliardsson, Patrik; Glasse, Miguel; Hayar, Aawatif; Hollevoet, Lieven; Hunter, Chris; Joshi, Madhura; Kaltenberger, Florian; Knopp, Raymond; Le, Khanh; Miljanic, Zoran; Murphy, Patrick; Naessens, Frederik; Nikaein, Navid; Nussbaum, Dominique; Pacalet, Renaud; Raghavan, Praveen; Sabharwal, Ashutosh; Sarode, Onkar; Spasojevic, Predrag; Sun, Yang; Tullberg, Hugo M.; Vander Aa, Tom; Van der Perre, Liesbet; Wetterwald, Michelle; Wu, Michael (2010-06-01)
    Wireless communication standards are developed at an ever-increasing rate of pace, and significant amounts of effort is put into research for new communication methods and concepts. On the physical layer, such topics include ...
  • Physical Layer Algorithm and Hardware Verification of MIMO Relays Using Cooperative Partial Detection 

    Amiri, Kiarash; Wu, Michael; Duarte, Melissa; Cavallaro, Joseph R. (2010-03-01)
    Cooperative communication with multi-antenna relays can significantly increase the reliability and speed. However, cooperative MIMO detection would impose considerable complexity overhead onto the relay if a full ...
  • LOW-COMPLEXITY AND HIGH-PERFORMANCE SOFT MIMO DETECTION BASED ON DISTRIBUTED M-ALGORITHM THROUGH TRELLIS-DIAGRAM 

    Sun, Yang; Cavallaro, Joseph R. (2010-03-01)
    This paper presents a novel low-complexity multiple-input multipleoutput (MIMO) detection scheme using a distributed M-algorithm (DM) to achieve high performance soft MIMO detection. To reduce the searching complexity, ...
  • Application-Specific Accelerators for Communications 

    Sun, Yang; Amiri, Kiarash; Brogioli, Michael; Cavallaro, Joseph R. (2010-01-01)
    For computation-intensive digital signal processing algorithms, complexity is exceeding the processing capabilities of general-purpose digital signal processors (DSPs). In some of these applications, DSP hardware accelerators ...
  • Configurable and Scalable Turbo Decoder for 4G Wireless Receivers 

    Sun, Yang; Cavallaro, Joseph R.; Zhu, Yuming; Manish, Goel (2010-01-01)
    The increasing requirements of high data rates and quality of service (QoS) in fourth-generation (4G) wireless communication require the implementation of practical capacity approaching codes. In this chapter, the application ...
  • Compiler Driven Architecture Design Space Exploration for DSP Workloads: A Study in Software Programmability Versus Hardware Acceleration 

    Brogioli, Michael C.; Cavallaro, Joseph R. (2009-11-01)
    Wireless communications and video kernels contain vast instruction and data level parallelism that can far outstrip programmable high performance DSPs. Hardware acceleration of these bottlenecks is commonly done at the ...
  • FPGA Prototyping of A High Data Rate LTE Uplink Baseband Receiver 

    Wang, Guohui; Yin, Bei; Amiri, Kiarash; Sun, Yang; Wu, Michael; Cavallaro, Joseph R. (2009-11-01)
    The Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard is becoming the appropriate choice to pave the way for the next generation wireless and cellular standards. While the popular OFDM ...