Now showing items 20-39 of 268

  • Baseband Architecture Design for Future Wireless Base-Station Receivers 

    Rajagopal, Sridhar (2000-05-20)
    This thesis demonstrates designing efficient algorithms and architectures to meet the real-time requirements of future wireless base-station receivers. Next generation receivers require orders-of-magnitude performance ...
  • A bit-streaming pipelined multiuser detector for wireless communications 

    Rajagopal, Sridhar; Cavallaro, Joseph R. (2001-05-20)
    This paper presents a bit-streaming, pipelined and reduced complexity architecture to meet real-time requirements for asynchronous multiuser detection in wireless communication CDMA receivers. Typically, asynchronous ...
  • Coding-Spreading Tradeoff for Lattice Codes 

    Khoshnevis, Ahmad (2001-04-20)
    A fixed bandwidth expansion can be achieved either by coding or spreading, while each have different effect on the resultant signal space. Coding increases both Shannon and Fourier bandwidth whereas spreading only increases ...
  • Communication Processors 

    Rajagopal, Sridhar; Cavallaro, Joseph R. (2005-07-01)
    Communication processors are processors with specific optimizations to support communication sys-tems. Communication processors exist in a wide variety of forms and can be categorized based on the communication system, ...
  • Compact Hardware Accelerator for Functional Verification and Rapid Prototyping of 4G Wireless Communication Systems 

    Guo, Yuanbin; McCain, Dennis (2004-11-01)
    In this paper, we propose an FPGA-based hardware accelerator platform with Xilinx Virtex-II V3000 in a compact PCMCIA form factor. By partitioning the complex algorithms in the 4G simulator to the hardware accelerator, ...
  • COMPARISON OF TWO NOVEL LIST SPHERE DETECTOR ALGORITHMS FOR MIMO-OFDM SYSTEMS 

    Myllylä, Markus; Silvola, Pirkka; Juntti, Markku; Cavallaro, Joseph R. (2006-09-01)
    In this paper, the complexity and performance of two novel list sphere detector (LSD) algorithms are studied and evaluated in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. ...
  • 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 ...
  • Complexity Analysis of MMSE Detector Architectures for MIMO OFDM Systems 

    Myllylä, Markus; Hintikka, Juha-Matti; Cavallaro, Joseph R.; Juntti, Markku; Limingoja, Matti; Byman, Aaron (2005-11-01)
    In this paper, a field programmable gate array (FPGA) implementation of a linear minimum mean square error (LMMSE) detector is considered for MIMO-OFDM systems. Two square root free algorithms based on QR decomposition ...
  • Configurable and Scalable High Throughput Turbo Decoder Architecture for Multiple 4GWireless Standards 

    Sun, Yang; Zhu, Yuming; Goel, Manish; Cavallaro, Joseph R. (2008-07-01)
    In this paper, we propose a novel multi-code turbo decoder architecture for 4G wireless systems. To support various 4G standards, a configurable multi-mode MAP (maximum a posteriori) decoder is designed for both binary and ...
  • 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 ...
  • Configurable LDPC Decoder Architecture for Regular and Irregular Codes 

    Karkooti, Marjan; Radosavljevic, Predrag; Cavallaro, Joseph R. (2008-11-01)
    Low Density Parity Check (LDPC) codes are one of the best error correcting codes that enable the future generations of wireless devices to achieve higher data rates with excellent quality of service. This paper presents ...
  • 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 ...
  • CORDIC Arithmetic for an SVD Processor 

    Cavallaro, Joseph R.; Luk, Franklin T. (1987-05-01)
    Arithmetic issues in the calculation of the Singular Value Decomposition (SVD) are discussed. Traditional algorithms using hardware division and square root are replaced with the special purpose CORDIC algorithms for ...
  • CORDIC Arithmetic for an SVD Processor 

    Cavallaro, Joseph R.; Luk, Franklin T. (1988-06-20)
    Arithmetic issues in the calculation of the Singular Value Decomposition (SVD) are discussed. Traditional algorithms using hardware division and square root are replaced with the special purpose CORDIC algorithms for ...
  • Data Collection by a Mobile Observer in a Single-hop Sensor Network 

    Chakrabarti, Arnab; Sabharwal, Ashutosh; Aazhang, Behnaam (2005-01-15)
    In this paper, we demonstrate significant reduction in communication power by using a mobile observer to collect data from a wireless single-hop network of static sensors. The key challenge in using a mobile observer is ...
  • Data-parallel Digital Signal Processors: Algorithm Mapping, Architecture Scaling and Workload Adaptation 

    Rajagopal, Sridhar (2004-05-01)
    Emerging applications such as high definition television (HDTV), streaming video, image processing in embedded applications and signal processing in high-speed wireless communications are driving a need for high performance ...
  • 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 ...
  • Delay and Rate Constrained Transmission Policies over Wireless Channels 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2001-11-20)
    In this paper, we study delay and rate-constrained transmission of bursty traffic over wireless channels. We characterize the minimum power requirements via bounds for both single user and multiuser downlink problems, using ...
  • Delay-constrained Scheduling: Power Efficiency, Filter Design, and Bounds 

    Khojastepour, Mohammad; Sabharwal, Ashutosh (2004-03-01)
    In this paper, packet scheduling with maximum delay constraints is considered with the objective to minimize average transmit power over Gaussian channels. The main emphasis is on deriving robust schedulers which do ...