From the Publisher: 
Orthogonal frequency-division multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. 
CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimising the use of available bandwidth. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end. 
Multi-Carrier (MC) CDMA is a combined technique of Direct Sequence (DS) CDMA (Code Division Multiple Access) and OFDM techniques. It applies spreading sequences in the frequency domain. 
Wireless communications has witnessed a tremendous growth during the past decade and further spectacular enabling technology advances are expected in an effort to render ubiquitous wireless connectivity a reality. 
This technical in-depth book is unique in its detailed exposure of OFDM, MIMO-OFDM and MC-CDMA. A further attraction of the joint treatment of these topics is that it allows the reader to view their design trade-offs in a comparative context. 
Divided into three main parts: 
Part I provides a detailed exposure of OFDM designed for employment in various applications 
Part II is another design alternative applicable in the context of OFDM systems where the channel quality fluctuations observed are averaged out with the aid of frequency-domain spreading codes, which leads to the concept of MC-CDMA 
Part III discusses how to employ multiple antennas at the base station for the sake of supporting multiple users in the uplink 
Portrays theentire body of knowledge currently available on OFDMProvides the first complete treatment of OFDM, MIMO(Multiple Input Multiple Output)-OFDM and MC-CDMAConsiders the benefits of channel coding and space time coding in the context of various application examples and features numerous complete system design examplesConverts the lessons of Shannon's information theory into design principles applicable to practical wireless systemsCombines the benefits of a textbook with a research monograph where the depth of discussions progressively increase throughout the book 
 
This all-encompassing self-contained treatment will appeal to researchers, postgraduate students and academics, practising research and development engineers working for wireless communications and computer networking companies and senior undergraduate students and technical managers.

OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting: Hanzo/OFDM

An Aloha-type access control mechanism for large mobile, multihop, wireless networks is defined and analyzed. This access scheme is designed for the multihop context, where it is important to find a compromise between the spatial density of communications and the range of each transmission. More precisely, the analysis aims at optimizing the product of the number of simultaneously successful transmissions per unit of space (spatial reuse) by the average range of each transmission. The optimization is obtained via an averaging over all Poisson configurations for the location of interfering mobiles, where an exact evaluation of signal over noise ratio is possible. The main mathematical tools stem from stochastic geometry and are spatial versions of the so-called additive and max shot noise processes. The resulting medium access control (MAC) protocol exhibits some interesting properties. First, it can be implemented in a decentralized way provided some local geographic information is available to the mobiles. In addition, its transport capacity is proportional to the square root of the density of mobiles which is the upper bound of Gupta and Kumar. Finally, this protocol is self-adapting to the node density and it does not require prior knowledge of this density.

/pdf/an-aloha-protocol-for-multihop-mobile-wireless-networks-ecvtgj8xch.pdf

An Aloha protocol for multihop mobile wireless networks

This is the advice of a committee of leading American experts, chaired by Harvey Fineberg from the Harvard School of Public Health. It represents the fifth report in a series, commissioned by the US National Research Council, that considers how society can understand and cope with decisions about risks. The Committee's remit was to provide advice on risk characterisation, defined by the Research Council as the translation of `the information in a risk assessment ... into a form usable by a risk manager, individual decision maker, or the public'. In this book, the Committee has responded to the challenge clearly and authoritatively, beginning with a profound re-definition of `risk characterisation' that forms the basis for all that follows. In the view of the Committee, risk characterisation is a process. It is a process which starts before quantitative analysis of the risks, because it includes defining what risks to assess, and how most appropriately to assess them. It is an iterative process, in which assumptions are challenged and re-worked, and new information may be incorporated. It is a process in which qualitative judgements contribute to the fuller understanding of the problem; where quantitative scientific estimates, although important, contribute only a part. Most fundamentally, it is a process which, in a democratic society, needs to involve all those affected by the perceived problem and consequent decision. In the words of the Committee: `Experience shows that analyses, no matter how thorough, that do not address the decision-relevant questions, use reasonable assumptions, and meaningfully include the key affected parties can result in huge expenses and long delays and jeopardise the quality of understanding and the acceptability of the final decisions.' In other words, until or unless we expand our understanding of risk characterisation to include the process of defining the assessment itself, we are unlikely to make progress in gaining public acceptance for major decisions on health or environmental issues. For those without sufficient time to read the book, the ten-page summary provides a succinct overview of the Committee's advice, complete with bullet points and emboldened key phrases. However, the main body of the book (and particularly Appendix A, which discusses a number of case studies) is well worth scanning for its well-reasoned and well-structured discussion of the issues and the suggested way forward. Nor is the Committee lost in an `academic ivory tower'. It recognises that involvement of all those with vested interests cannot ensure a rapid or consensus solution or preclude some groups `dropping out' and choosing the route of litigation. It also recognises that allowing a `voice' for a wide range of interest groups can be time consuming and difficult to manage. However, the Committee argues: `While we are sensitive to concerns about cost and delay, we note that huge costs and delays have sometimes resulted when a risk situation was inadequately diagnosed, a problem misformulated, key interested and affected parties did not participate, or analysis proceeded unintegrated with deliberation. We believe that following [our] principles can reduce delays and costs as much as or more than it increases them.' So what are the Committee's principles? Getting the science right - any quantitative science that is undertaken must be of the highest standards. Getting the right science - this ensures that all the relevant risks are considered. Getting the right participation - this ensures that all those affected have a `voice' in the process. Getting the participation right - this ensures that the process is responsive to the needs of all the participants. Developing an accurate, balanced and informative synthesis - this should include a balanced understanding of the uncertainties in current knowledge, encompassing ignorance and indeterminacy as well as more quantifiable uncertainties. Again, in the words of the Committee: `These criteria are related. To be decision-relevant, risk characterisation must be accurate, balanced and informative. This requires getting the science right and getting the right science. Participation helps ask the right questions of the science, check the plausibility of assumptions, and ensure that any synthesis is both balanced and informative.' In order to set up an appropriate risk characterisation process, the Committee recommends that those responsible for it should `begin by developing a provisional diagnosis of the decision situation' in order to identify potential participants, allocate resources and structure the process. However, in doing so, they should `treat the diagnosis as tentative and remain open to change, always keeping in mind that their goal is a process that leads to a useful and credible risk characterization'. The Committee also stresses the need for those responsible for the process to `develop the capability to cope with attempts by some interested and affected parties to delay decision, and to develop a range of strategies for reaching closure'. This is likely to require the development of new skills and may require organisational changes `to improve communication across sub-units and to allow for the flexibility and judgement necessary to match the process to decision'. This balanced, reasoned and authoritative book is, in my opinion, a `must for all those involved in informing societal decision on risks.

Understanding Risk - Informing Decisions in a Democratic Society

From the Publisher:
Orthogonal frequency-division multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies.
CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimising the use of available bandwidth. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end.
Multi-Carrier (MC) CDMA is a combined technique of Direct Sequence (DS) CDMA (Code Division Multiple Access) and OFDM techniques. It applies spreading sequences in the frequency domain.
Wireless communications has witnessed a tremendous growth during the past decade and further spectacular enabling technology advances are expected in an effort to render ubiquitous wireless connectivity a reality.
This technical in-depth book is unique in its detailed exposure of OFDM, MIMO-OFDM and MC-CDMA. A further attraction of the joint treatment of these topics is that it allows the reader to view their design trade-offs in a comparative context.
Divided into three main parts:
Part I provides a detailed exposure of OFDM designed for employment in various applications
Part II is another design alternative applicable in the context of OFDM systems where the channel quality fluctuations observed are averaged out with the aid of frequency-domain spreading codes, which leads to the concept of MC-CDMA
Part III discusses how to employ multiple antennas at the base station for the sake of supporting multiple users in the uplink
Portrays theentire body of knowledge currently available on OFDMProvides the first complete treatment of OFDM, MIMO(Multiple Input Multiple Output)-OFDM and MC-CDMAConsiders the benefits of channel coding and space time coding in the context of various application examples and features numerous complete system design examplesConverts the lessons of Shannon's information theory into design principles applicable to practical wireless systemsCombines the benefits of a textbook with a research monograph where the depth of discussions progressively increase throughout the book

This all-encompassing self-contained treatment will appeal to researchers, postgraduate students and academics, practising research and development engineers working for wireless communications and computer networking companies and senior undergraduate students and technical managers.

OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting

The lithium-ion battery is an ideal candidate for a wide variety of applications due to its high energy/power density and operating voltage. Some limitations of existing lithium-ion battery technology include underutilization, stress-induced material damage, capacity fade, and the potential for thermal runaway. This paper reviews efforts in the modeling and simulation of lithium-ion batteries and their use in the design of better batteries. Likely future directions in battery modeling and design including promising research opportunities are outlined.

/pdf/modeling-and-simulation-of-lithium-ion-batteries-from-a-5ggc923gnh.pdf

Modeling and Simulation of Lithium-Ion Batteries from a Systems Engineering Perspective

From the Publisher:
Strengthen your knowledge of Code Division Multiple Access (CDMA) technology, and build a solid understanding of the technical details and engineering design principles behind the robust new IS-95 digital cellular system standard with this comprehensive reference tool. Based upon the authors' high-impact international training seminars on CDMA system engineering technology, this book helps practicing cellular engineers better understand the technical elements associated with the CDMA system, and how they are applied to the IS-95 standard.

Practicing engineers who work with CDMA cellular, PCS, and WLL systems should have this guide close at hand, but even if you're engineering background isn't CDMA-specific, you'll appreciate the book's easy-to-follow, tutorial approach to the technology. Packed with nearly 2,000 equations, and supported by clearly presented, easy-to-understand explanations and examples, it not only shows you how to apply real-world CDMA system design techniques such as cell planning and optimization  it helps you understand the underlying reasons behind particular CDMA system design selections. Specifically, you learn...

? Proven-under-fire techniques that help you assess system modulation and convolutional code
performance, and optimize cellular system and Erlang capacity

? How to design PN code generators for spread-spectrum applications, and how to use masks to control PN code phase

? How you can use RAKE diversity combining techniques to combat fading

? How to control CDMA forward link power allocation to help maximize system capacity

An essential reference tool for CDMA system design engineers,service providers consultants, and technical managers, the book also equips R&D professionals with the knowledge they need to develop tools to enhance new or existing CDMA cellular, PCS, and WLL systems.

/pdf/cdma-systems-engineering-handbook-1ksogb4p0z.pdf

CDMA Systems Engineering Handbook

A method for determining the amounts of channel powers in the orthogonally multiplexed forward link of a CDMA cellular telephone or PCS system required to provide sufficiently high signal levels for these channels at the location of a mobile telephone receiver at or near the edge of the cell. The method first formulates the power requirements for the several types of forward link channels as a system of equations in the with the powers as variables, parametric in several parameters, including the number of active traffic channels, that vary with time. The method then proceeds to solve the system of equations to determine time varying powers of the pilot, synchronization, and paging channels; it also determines a value of the required power for a traffic channel that is useful for initializing the existing closed loop forward traffic channel power control of the system.

Method for determining forward link channel powers for a CDMA cellular or PCS system

A method and program for determining the PN generator mask which is required to obtain a specific shift of the PN sequence at the output of a phase shift network (PSN), relative to the reference sequence that is represented by the inverse of the characteristic polynomial of the PN sequence. The method applies for any initial loading (state) of the PN generator, which can be either the simple shift register generator (SSRG) type or the modular shift register generator (MSRG) type of linear feedback shift register (LFSR). The application of the present invention includes, but is not limited to, any code division multiple access (CDMA) cellular telephone system which requires a method for generating specific shifts of a given reference PN sequence for each base station and each mobile station in the network.

Method for calculating the PN generator mask to obtain a desired shift of the PN code

In FDMA and TDMA cellular systems, a requested call will be blocked when all frequency or time slots have been assigned to other users. In a CDMA cellular system, blocking will occur when the reverse link multiple access interference power reaches a predetermined level which is set to maintain acceptable signal quality. The number of users for which the CDMA blocking probability equals a certain value (usually 1% or 2%) is defined to be the "Erlang capacity" of the system and is related to an equivalent number of channels in an FDMA or TDMA cellular system. In this paper, the calculation of the CDMA blocking probability is based on a new analysis of the total squared power of other-cell interference. The calculation of CDMA Erlang capacity based on this result gives a result that is higher than that given in previous analyses.

On the Erlang capacity of CDMA cellular systems

New solutions are given for the minimum required transmitter powers for CDMA cellular or PCS systems for all categories of the forward link channels, namely pilot, sync, paging, and traffic channels. Any excess power over that required for the specified error performance of any channel category always reduces the user capacity, so it is necessary to know the minimum required power levels for all of the forward link channels. We show the solutions for the forward link channel powers by including fade margins to improve link reliability in lognormal shadowing. The amount of margin required to achieve a given reliability is calculated. We derive system capacity expressions as functions of link margins for specified reliability requirements and the corresponding minimum transmitter power levels. Example solutions are also presented in graphical forms for typical realistic operational parameters, to illustrate the use of the solution formulas. These solutions can be applied to maximize the capacity of a particular CDMA cellular or PCS system under different parametric situations.

Solutions for minimum required forward link channel powers in CDMA cellular and PCS systems

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