-
Software-defined radios (SDRs) have been around for more than a decade. The
first complete Global Positioning System (GPS) implementation was described
by Dennis Akos in 1997. Since then several research groups have presented their
contributions.We therefore find it timely to publish an up-to-date text on the subject
and at the same time include Galileo, the forthcoming European satellitebased
navigation system. Both GPS and Galileo belong to the category of Global
Navigation Satellite Systems (GNSS)
標(biāo)簽：
Software-defined
complete
Global
radios
上傳時(shí)間：
2013-12-16
上傳用戶：xauthu
-
Accurate pose estimation plays an important role in solution of simultaneous localization and mapping (SLAM) problem, required for many robotic applications. This paper presents a new approach called R-SLAM, primarily to overcome systematic and non-systematic odometry errors which are generally caused by uneven floors, unexpected objects on the floor or wheel-slippage due to skidding or fast turns.The hybrid approach presented here combines the strengths of feature based and grid based methods to produce globally consistent high resolution maps within various types of environments.
標(biāo)簽：
localization
environments
challenging
Resilient
mapping
R-SLAM
and
in
上傳時(shí)間：
2019-09-15
上傳用戶：zhudx2007
-
The objective of this book is to allow the reader to predict the received
signal power produced by a particular radio transmitter. The first two
chapters examine propagation in free space for point-to-point and
point-to-area transmission, respectively. This is combined with a dis-
cussion regarding the characteristics of antennas for various purposes. In
chapter 3, the effect of obstacles, whether buildings or mountains, is
discussed and analytical methods, whereby the strength of a signal is the
shadow of an obstacle can be predicted, are presented.
標(biāo)簽：
Propagation
Essentials
Radio
Wave
of
上傳時(shí)間：
2020-05-27
上傳用戶：shancjb
-
In this paper we revisit hybrid analog-digital precoding systems with emphasis on their modelling
and radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations.
For this, we decompose the analog beamforming networks (ABFN) as a bank of commonly used RF
components and formulate realistic model constraints based on their S-parameters. Specifically, we
concentrate on fully-connected ABFN (FC-ABFN) and Butler networks for implementing the discrete
Fourier transform (DFT) in the RF domain. The results presented in this paper reveal that the performance
and energy efficiency of hybrid precoding systems are severely affected, once practical factors are
considered in the overall design. In this context, we also show that Butler RF networks are capable of
providing better performances than FC-ABFN for systems with a large number of RF chains.
標(biāo)簽：
Analog-Digital
Precoding
Hybrid
上傳時(shí)間：
2020-05-27
上傳用戶：shancjb
-
This books presents the research work of COST 273 Towards Mobile Broadband Multimedia
Networks, hence, it reports on the work performed and on the results achieved within the project
by its participants. The material presented here corresponds to the results obtained in four years
of collaborative work by more than 350 researchers from 137 institutions (universities, operators,
manufacturers, regulators, independent laboratories and others – a full list is provided in Appendix
B) belonging to 29 countries (mainly European, but also from Asia and North America) in the area of
mobileradio. Theobjectiveofpublishingtheseresultsasabookisessentiallytomakethemavailable
to an audience wider than the project. In fact, it just follows a ‘tradition’ of previous COST Actions
in this area of telecommunications, i.e. COST 207, 231 and 259.
標(biāo)簽：
Multimedia
Techniques
Broadband
Networks
Mobile
上傳時(shí)間：
2020-05-30
上傳用戶：shancjb
-
Before delving into the details of orthogonal frequency division multiplexing (OFDM), relevant
background material must be presented first. The purpose of this chapter is to provide the necessary
building blocks for the development of OFDM principles. Included in this chapter are reviews of stochastic
and random process, discrete-time signals and systems, and the Discrete Fourier Transform (DFT). Tooled
with the necessary mathematical foundation, we proceed with an overview of digital communication
systems and OFDM communication systems. We conclude the chapter with summaries of the OFDM
wireless LAN standards currently in existence and a high-level comparison of single carrier systems versus
OFDM.
標(biāo)簽：
Wireless
OFDM
LANS
上傳時(shí)間：
2020-05-31
上傳用戶：shancjb
-
In this book we focus on the basic signal processing that underlies current and
future ultra wideband systems. By looking at signal processing in this way we
hope this text will be useful even as UWB applications mature and change or
regulations regarding ultra wideband systems are modified. The current UWB
field is extremely dynamic, with new techniques and ideas being presented at every
communications and signal-processing conference. The basic signal-processing
techniques presented in this text though will not change for some time to come.
Thus, we have taken a somewhat theoretical approach, which we believe is longer
lasting and more useful to the reader in the long term than an up-to-the-minute
summary that is out of date as soon as it is published.
標(biāo)簽：
Wideband
Signals
Systems
Ultra
1st
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
-
Software-defined radios (SDRs) have been around for more than a decade. The
first complete Global Positioning System (GPS) implementation was described
by Dennis Akos in 1997. Since then several research groups have presented their
contributions. We therefore find it timely to publish an up-to-date text on the sub-
ject and at the same time include Galileo, the forthcoming European satellite-
based navigation system. Both GPS and Galileo belong to the category of Global
Navigation Satellite Systems (GNSS).
標(biāo)簽：
A_Software-Defined_GPS_and_Galile
o_Receiver
上傳時(shí)間：
2020-06-09
上傳用戶：shancjb
-
設(shè)計(jì)了自動(dòng)控制系統(tǒng)綜合實(shí)驗(yàn)案例“基于LabVIEW和單片機(jī)的溫度控制系統(tǒng)設(shè)計(jì)”。實(shí)驗(yàn)系統(tǒng)硬件部分由單片機(jī)、溫度傳感器、D/A轉(zhuǎn)換模塊、調(diào)壓模塊和電烤箱組成,設(shè)計(jì)了單片機(jī)與各個(gè)模塊之間的接口電路。軟件部分采用LabVIEW軟件實(shí)現(xiàn)控制算法,并設(shè)計(jì)監(jiān)控界面實(shí)現(xiàn)參數(shù)設(shè)定、溫度數(shù)據(jù)實(shí)時(shí)監(jiān)控等功能。設(shè)計(jì)了單片機(jī)與LabVIEW軟件之間的串口通信程序,實(shí)現(xiàn)了輸入、輸出數(shù)據(jù)的傳輸。通過(guò)綜合實(shí)驗(yàn)系統(tǒng)設(shè)計(jì),使學(xué)生得到控制系統(tǒng)設(shè)計(jì)和實(shí)驗(yàn)調(diào)試等綜合能力的訓(xùn)練。A comprehensive experimental case of the automatic control system is presented,which is the design of the temperature control system based on LabVIEW and SCM.The hardware part of the experimental system is composed of the SCM,temperature sensor,D/A conversion module,voltage regulating module and electric oven.The interface circuit between the SCM and each module is designed.In the software part,LabVIEW software is used to realize the control algorithm,and the monitoring interface is designed to realize the functions of parameter setting,temperature data real-time monitoring,etc.The serial communication program between the SCM and LabVIEW software is designed to realize the transmission of input and output data.Through the design of this comprehensive experimental system,students can get the comprehensive ability training for the control system design,experiment debugging,etc.
標(biāo)簽：
labview
單片機(jī)
自動(dòng)控制系統(tǒng)
上傳時(shí)間：
2022-03-27
上傳用戶：qdxqdxqdxqdx
