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Resource-efficient multi-antenna designs for mobile ad hoc networks : focus on PHY, MAC and Cross-Layer / Feng Xu. 2008
Inhalt
Introduction
Mobile ad hoc networks (MANETs)
Resources in wireless communications
Definitions on resource-efficiency
The objective of this work
The outline of this thesis
PHY Layer Designs: Multi-Antenna Techniques
Traditional single antenna digital communication system
Fundamentals on antenna
RF front-end signal processing
Smart antennas (beamforming)
Basic principle
Switched beam (fixed beamforming)
Steered beam (adaptive beamforming)
Space diversity techniques
Basic principle
Receive diversity
Transmit diversity & Space-time coding (STC)
Multiple-Input Multiple-Output (MIMO)
A cost analysis on multi-antenna techniques based on hardware complexity and power consumption
MAC and Cross-Layer Designs
Traditional MAC designs for MANETs
The CSMA/CA used by IEEE 802.11 MAC
Examples for further explanations on CSMA/CA
My proposal to the exposed node problem
BF-MAC
An overview of previous investigations
Multi-directional-antenna (MDA) based BF-MAC (MDA-MAC)
Space diversity MAC (SD-MAC)
BF-MAC vs. SD-MAC
Radiation power control (PC)
Transceiver power management (PM)
Energy model for the transceiver
Power management mechanism
Network simulation
Simulation configurations
Results
Resource-efficiency comparison
Simplified Switched Beam (SSB): PHY + MAC Design and Simulation
Motivation
Antenna array selection
The design of SSB
Basic principle
Analysis on the length of the training period
SSB-MAC: the associated MAC protocol
Beamforming vs. Diversity
Interference suppression (IS) technique
Network simulation
Simulation configurations
Results
Resource-efficiency comparison
SSB Test-bed Implementation and Measurements
Carrier frequency band selection
Hardware implementation
Antenna
RF switch
RF combiner & divider
RF cables
RF transceiver & Baseband component
Software stack
Upper-layer software (ULS)
SSB processing unit (SPU)
Test-bed measurements and analysis
Scenario
Selected measures
Experiment configurations
Measurement results and analysis
Conclusions and Outlook
Conclusions
Outlook
SSB Processing Unit (SPU) Implementation Details
Operating specification of CC2400 SPI
Top-level schematic diagram of the SPU
State machine descriptions for each component of the SPU
Sub-modules of SPI master
Large packet transfer support of SPI master
Sub-modules of SSB controller
Other auxiliary modules of the SPU
Experiences learned from the implementation
The array signal processing must be performed using the hardware-based solution
Two VHDL design tips
Measured timing diagrams on I/Os between CC2400 and SPU
Derivation of IF and Baseband Signals with Phase Shift
Derivation on the I-channel
Derivation on the Q-channel
Derivation applying the analytic signal representation
Derivation of baseband signals with phase shift
Concluding remarks
List of Abbreviations
List of Symbols
List of Figures
List of Tables
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