A Real-time Software Implementation of an OFDM Modem Suitable for Software Defined Radios PDF Download
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Author: Antonio Lucio Cinquino
Publisher:
ISBN:
Category : Modems
Languages : en
Pages : 0
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Book Description
This thesis describes a real-time, DSP implementation of a baseband OFDM system, which includes interleaving and forward error correction algorithms. Software modules representing discrete system blocks are created and sequentially called upon as needed. The software reconfigurable system is developed on a Texas Instruments TMS320C6201 Evaluation Module, which is based on a fixed-point processor. Different combinations of arithmetic precision and speed for the fixed-point operations were explored. The decisive combination was used to evaluate the accuracy of the system by plotting bit-error curves against an equivalent floating-point model. System efficiency is employed from the design stage through the use of Look-Up tables as well as cyclic shift registers. Upon implementation, the system is built using settings optimized for speed. In addition, memory management is used to ensure that critical instructions are kept on the fast on-chip memory while different access times for retrieving data on external memory were evaluated for best results. Finally, each software module is profiled to investigate and remove unnecessary latency issues. Processing efficiency is monitored by recording throughput results, which are used to calculate maximum bit-rates. Using these results, estimations are made for bit-rates achievable by higher performance processors. These estimations demonstrate that a highly flexible DSP platform can ultimately meet speed and flexibility requirements for Software Defined Radios.
Author: Antonio Lucio Cinquino
Publisher:
ISBN:
Category : Modems
Languages : en
Pages : 0
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Book Description
This thesis describes a real-time, DSP implementation of a baseband OFDM system, which includes interleaving and forward error correction algorithms. Software modules representing discrete system blocks are created and sequentially called upon as needed. The software reconfigurable system is developed on a Texas Instruments TMS320C6201 Evaluation Module, which is based on a fixed-point processor. Different combinations of arithmetic precision and speed for the fixed-point operations were explored. The decisive combination was used to evaluate the accuracy of the system by plotting bit-error curves against an equivalent floating-point model. System efficiency is employed from the design stage through the use of Look-Up tables as well as cyclic shift registers. Upon implementation, the system is built using settings optimized for speed. In addition, memory management is used to ensure that critical instructions are kept on the fast on-chip memory while different access times for retrieving data on external memory were evaluated for best results. Finally, each software module is profiled to investigate and remove unnecessary latency issues. Processing efficiency is monitored by recording throughput results, which are used to calculate maximum bit-rates. Using these results, estimations are made for bit-rates achievable by higher performance processors. These estimations demonstrate that a highly flexible DSP platform can ultimately meet speed and flexibility requirements for Software Defined Radios.
Author: Milan Zivkovic
Publisher:
ISBN: 9783844029246
Category :
Languages : en
Pages : 223
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Book Description
Author: Alexander M. Wyglinski
Publisher: Artech House
ISBN: 1630814598
Category : Technology & Engineering
Languages : en
Pages : 375
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Book Description
Based on the popular Artech House classic, Digital Communication Systems Engineering with Software-Defined Radio, this book provides a practical approach to quickly learning the software-defined radio (SDR) concepts needed for work in the field. This up-to-date volume guides readers on how to quickly prototype wireless designs using SDR for real-world testing and experimentation. This book explores advanced wireless communication techniques such as OFDM, LTE, WLA, and hardware targeting. Readers will gain an understanding of the core concepts behind wireless hardware, such as the radio frequency front-end, analog-to-digital and digital-to-analog converters, as well as various processing technologies. Moreover, this volume includes chapters on timing estimation, matched filtering, frame synchronization message decoding, and source coding. The orthogonal frequency division multiplexing is explained and details about HDL code generation and deployment are provided. The book concludes with coverage of the WLAN toolbox with OFDM beacon reception and the LTE toolbox with downlink reception. Multiple case studies are provided throughout the book. Both MATLAB and Simulink source code are included to assist readers with their projects in the field.
Author: Shabbir A. Bagasrawala
Publisher:
ISBN:
Category : Orthogonal frequency
Languages : en
Pages : 134
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Book Description
Author: Robert Oshana
Publisher: Elsevier
ISBN: 0123865352
Category : Computers
Languages : en
Pages : 658
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Book Description
This book includes a range of techniques for developing digital signal processing code; tips and tricks for optimizing DSP software; and various options available for constructing DSP systems from numerous software components.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 324
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Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author: Robert W Stewart
Publisher:
ISBN: 9780992978723
Category : Computers
Languages : en
Pages : 672
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Book Description
The availability of the RTL-SDR device for less than $20 brings software defined radio (SDR) to the home and work desktops of EE students, professional engineers and the maker community. The RTL-SDR can be used to acquire and sample RF (radio frequency) signals transmitted in the frequency range 25MHz to 1.75GHz, and the MATLAB and Simulink environment can be used to develop receivers using first principles DSP (digital signal processing) algorithms. Signals that the RTL-SDR hardware can receive include: FM radio, UHF band signals, ISM signals, GSM, 3G and LTE mobile radio, GPS and satellite signals, and any that the reader can (legally) transmit of course! In this book we introduce readers to SDR methods by viewing and analysing downconverted RF signals in the time and frequency domains, and then provide extensive DSP enabled SDR design exercises which the reader can learn from. The hands-on SDR design examples begin with simple AM and FM receivers, and move on to the more challenging aspects of PHY layer DSP, where receive filter chains, real-time channelisers, and advanced concepts such as carrier synchronisers, digital PLL designs and QPSK timing and phase synchronisers are implemented. In the book we will also show how the RTL-SDR can be used with SDR transmitters to develop complete communication systems, capable of transmitting payloads such as simple text strings, images and audio across the lab desktop.
Author: Farzad Manavi
Publisher:
ISBN:
Category : Field programmable gate arrays
Languages : en
Pages : 0
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Book Description
In this thesis, a prototype design for the Physical Layer of IEEE 802.11a standard, which is based on Orthogonal Frequency Division Multiplexing (OFDM) technique, is presented. Implementation aspects of an OFDM modem on Xilinx Virtex II field programmable gate array (FPGA) are addressed. The system includes a synchronization circuitry used for packet detection and time synchronization. The design flow starts with floating-point modeling with parameters specified by IEEE 802.11a for the physical layer of indoor Wireless Local Area Network (WLAN) modems. After algorithmic exploration and performance simulations, the fixed-point refinement is verified to compromise between sufficient arithmetic precision and high-speed hardware necessary for real-time communication systems. At this step of design, different synchronization schemes are examined and as the result of comparison; a modified algorithm based on the delayed correlation of received preamble symbols is selected for hardware implementation. Finally, the architecture with lowest power consumption and required speed specified by the standard is achieved. This design is efficiently synthesized on 0.15?m/0.12?m CMOS 8-layer metal process Virtex II FPGA. The resulting hardware implementation is simulated at the system clock speed of 72MHz and analyzed from timing point of view to verify adequate performance.
Author: Sun, Chen
Publisher: IGI Global
ISBN: 1599049899
Category : Education
Languages : en
Pages : 584
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Book Description
Provides information on smart antenna technologies featuring contributions with in-depth descriptions of terminologies, concepts, methods, and applications related to smart antennas in various wireless systems.
Author: Hiroshi Harada
Publisher: Artech House
ISBN: 9781580530446
Category : Technology & Engineering
Languages : en
Pages : 498
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Book Description
This cutting-edge, first-of-its-kind resource gives you a comprehensive understanding of the simulation and evaluation methods used for today's mobile communication systems. Written by two highly regarded experts in the field, the book focuses on the performance of both the physical and protocol layer transmission scheme. It defines and presents several invaluable simulation tools written in MATLAB® code, along with clear examples that explain their use.
