From the Publisher:
Frequency spectrum is a limited and valuable resource for wireless communications. A good example can be observed among network operators in Europe for the prices to pay for UMTS-frequency bands. Therefore, the first goal when designing future wireless communication systems (e.g. 4G - fourth generation) has to be the increase in spectral efficiency. The development in digital communications in the past years has enabled efficient modulation and coding techniques for robust and spectral efficient data, speech, audio and video transmission. These are the multi-carrier modulation (e.g. OFDM) and the spread spectrum technique (e.g. DS-CDMA), where OFDM was chosen for broadcast applications (DVB, DAB) as well as for broadband wireless indoor standards (ETSI HIPERLAN-II, IEEE-802.11) and the DS-CDMA was selected in mobile communications (IS-95, third generation mobile radio systems world wide, UMTS/IMT 2000).

Since 1993 various combinations of multi-carrier (MC) modulation and the spread spectrum (SS) technique have been introduced and the field of MC-SS communications has become an independent and important research topic with increasing activities. New application fields have been proposed such as high rate cellular mobile, high rate wireless indoor and LMDS. It has been shown that MC-SS offers the high spectral efficiency, robustness and flexibility that is required for the next generation systems. Meanwhile, different alternative hybrid schemes such as OFDM/OFDMA, MC-TDMA, etc. have been deeply analysed and adopted in different international standards (ETSI-BRAN, IEEE-802 & MMAC).
Multi-Carrier & Spread-Spectrum: Analysis of Hybrid Air Interfaces draws together all ofthe above mentioned hybrid schemes therefore providing a greatly needed resource for system engineers, telecommunication designers and researchers in order to enable them to develop, build and deploy several schemes based on MC-transmission for the next generation systems (which will be an integration of broadband multimedia services covering both 4G mobile and fixed wireless systems). 
Offers a complete treatment of multi-carrier, spread-spectrum (SS) and time division multiplexing (TDM) techniquesProvides an in-depth insight into hybrid multiple access techniques based on multi-carrier (MC) transmissionPresents numerous hybrid multiple access and air interface architectures including OFDM/CDMA, MC-CDMA, MC-DS-CDMA and MT-CDMACovers new techniques such as space-time coding and software radio

Telecommunications engineers, hardware & software system designers and researchers as well as students, lecturers and technicians will all find this an invaluable addition to their bookshelf.

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Multi-Carrier and Spread Spectrum Systems

Carrier Interferometry (CI) provides wideband transmission protocols with frequency-band selectivity to improve interference rejection, reduce multipath fading, and enable operation across non-continuous frequency bands. Direct-sequence protocols, such as DS-CDMA, are provided with CI to greatly improve performance and reduce transceiver complexity. CI introduces families of orthogonal polyphase codes that can be used for channel coding, spreading, and/or multiple access. Unlike conventional DS-CDMA, CI coding is not necessary for energy spreading because a set of CI carriers has an inherently wide aggregate bandwidth. Instead, CI codes are used for channelization, energy smoothing in the frequency domain, and interference suppression. CI-based ultra-wideband protocols are implemented via frequency-domain processing to reduce synchronization problems, transceiver complexity, and poor multipath performance of conventional ultra-wideband systems. CI allows wideband protocols to be implemented with space-frequency processing and other array-processing techniques to provide either or both diversity combining and sub-space processing. CI also enables spatial processing without antenna arrays. Even the bandwidth efficiency of multicarrier protocols is greatly enhanced with CI. CI-based wavelets avoid time and frequency resolution trade-offs associated with conventional wavelet processing. CI-based Fourier transforms eliminate all multiplications, which greatly simplifies multi-frequency processing. The quantum-wave principles of CI improve all types of baseband and radio processing.

Multicarrier sub-layer for direct sequence channel and multiple-access coding

A method of delivering an audio and/or visual media file including, for example, one or more of full or partial master recordings of songs, musical compositions, ringtones, videos, films, television shows, personal recordings, animation and combinations thereof, over the air wirelessly, from one or more servers to an electronic device with or without an Internet connection, said method comprising transmitting and audio and/or visual media file in compressed format to said electronic device, and wherein the electronic device is effective to receive said audio and/or visual file and playback said audio and/or visual content on demand by a user.

Media delivery platform

Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.

Uplink pilot and signaling transmission in wireless communication systems

In the resource mapping method for data transmission, a time-frequency resource of a slot interval including OFDM symbols is divided into traffic channels and shared among the subscribers, the traffic channel including resource blocks uniformly distributed in the whole transmit frequency band, the resource block including consecutive subcarriers of consecutive received symbols having at least one inserted pilot symbol. The pilot symbols and the channel-encoded and modulated data symbols are processed by time-frequency mapping according to the resource-block-based mapping method to generate received symbols. The receiver separates the received symbols by subscribers according to the resource-block-based mapping method in a frequency domain, and performs iterative channel estimation, demodulation, and decoding by using the pilot and a data reference value after decoding for each traffic channel.

Apparatus for OFDMA transmission and reception for coherent detection in uplink of wireless communication system and method thereof

The method of the invention is based on an optimum combination of multi-carrier modulation with the spread-spectrum technique. The data of a subscriber station are spread, with the data of a subscriber station being modulated on a set of orthogonal spread sequences and superimposed. The data of a subscriber station are transmitted to a partial quantity of subcarriers in the frequency band, with the partial quantity of sub-carriers associated with the individual subscriber stations being disjunct and distributed over the entire transmission band. A channel estimation required for receiving-side data detection is performed by means of filtering in the time and/or frequency direction of reference symbols. A low-complexity maximum-likelihood sequence estimation is possible for data detection. The method of the invention is well-suited for use for both the upstream and downlinks in future cellular mobile-radio systems.

Method of simultaneous radio transmission of digital data between a plurality of subscriber stations and a base station

Techniques for data transmission using high-order modulation are provided. According to one aspect, parameters of a transmission link are determined, and a multilevel coding scheme and a high-order modulation signal constellation are selected on the basis of the determined parameters. An information indicating the selected multilevel coding scheme and high-order modulation signal constellation and data symbols encoded according to the selected multilevel coding scheme and high-order modulation signal constellation are transmitted. In other aspects, QPSK data symbols are embedded between M-QAM data symbols or M-PSK data symbols with M>4. The QPSK data symbols may be used to improve the efficiency of the decoding process.

Techniques for data transmission using high-order modulation

The wireless standards 3GPP Long Term Evolution (LTE), WiMAX, IEEE 802.11a/n, and DxB have in common that they apply the spectrally efficient multi-carrier modulation in order to achieve very high rate data transmission. This trend is expected to continue in the future with the development of the next generation of mobile wireless communications under the IMT-Advanced standardization activities. Additional measures like advanced coding, spreading, and MIMO are combined with multi-carrier transmission to further enhance the efficiency of future systems. The aim of Multi-Carrier Systems & Solutions 2009 is to edit the ensemble of the newest contributions and research results in this field that have been presented during the 7th International Workshop on Multi-Carrier Systems & Solutions (MC-SS 2009), held in Herrsching, Germany.

Multi-Carrier Systems & Solutions 2009: Proceedings from the 7th International Workshop on Multi-Carrier Systems & Solutions, May 2009, Herrsching, Germany

* Editorial Introduction. Acknowledgement. * I: General Issues. Broadband Wireless Access Based on VSF-OFCDM and VSCRF-CDMA and its Experiments* H. Atarashi, M. Sawahashi. An OFDM Based System Proposal for 4G Downlinks* A. Svensson, A. Ahlen, A. Brunstrom, T. Ottosson, M. Sternad. Channel Overloading in CDMA with Scalable Signature Sets and Turbo Detection F. Vanhaverbeke, M. Moeneclaey. Virtual Subcarrier Assignment (VISA): Principle and Applications S. Hara. On Pilot-Symbol Aided Channel Estimation for MC-CDMA in the Presence of Cellular Interference G. Auer, A. Dammann, S. Sand, S. Kaiser. New 2D-MC-DS-SS-CDMA Techniques based on Two-dimensional Orthogonal Complete Complementary Codes P. Farkas, M. Turcsany. Performance of Multirate Transmission Schemes for MC-CDMA Systems Z. Li, M. Latva-aho. Priority Swapping Sub-carrier and User Allocation Techniques for Adaptive Multi-carrier Based Systems E. Al-Susa, D. Cruickshank, S. McLaughlin. Sub-band Loading for Pre-Equalized Uplink OFDM-CDMA Systems N. Benvenuto, P. Bisaglia, F. Tosato. A Study on Subcarrier Power Control of OFDM Transmission Diversity combined with Data Spreading S. Kanamori, M. Itami, K. Itoh, H. Ohta. Packet Re-Transmission Options for the SS-OFDM-F/TA System R. Novak, W.A. Krzymien. Comparison of Iterative Detection Schemes for MIMO Systems with Spreading Based on OFDM D.Yacoub, M.A. Dangl, U.Marxmeier, W.G. Teich, J. Lindner. * II: Coding, Modulation And Spreading. Turbo Product Codes for an Orthogonal Multicarrier DS-CDMA System D.A. Guimaraes, J. Portugheis. Performance Evaluation of Diversity Gain and Coding Gain in Coded Orthogonal Multi-Carrier Modulation Systems M. Fujii, M. Itami, K.Itoh. Adaptive Coding in MC-CDMA/FDM Systems with Adaptive Sub-Band Allocation P. Trifonov, E. Costa, A. Filippi, M. Weckerle. A Study of Multicarrier CDMA Systems with Differential Modulation H. Xing, M. Renfors. Spreading Sequences for Multi-Carrier CDMA Systems with Nonlinear Amplifier M. Saito, T. Hara, M. Okada, H. Yamamoto, T. Gima. Analysis of Linear Receivers for MC-CDMA with Digital Prolate Functions I. Raos, A. del Cacho, S. Zazo. Evaluation of Different Spreading Sequences for MC-CDMA in WLAN Environments A. Garcia-Armanda, J.R. De Torre, V. P. Gil Jimenez, M. J. Fernandez-Getino Garci. * III: Synchronization And Channel Estimation. Uplink and Downlink MC-DS-CDMA Synchronization Sensitivity* H. Steendam, M. Moeneclaey. Study of Symbol Synchronization in MC-CDMA Systems Y. Zhang, R. Hoshyar, R. Tafazolli. Iterative Channel Estimation Approach for Space-Frequency Coded OFDM Systems with Transmitter Diversity H.A. Cirpan, H. Dogan, E. Panayirci. Comparison of Pilot Multiplexing Schemes for ML Channel Estimation in Coded OFDM-CDMA M. Feuersanger, F. Hasenknopf, V. Kuhn, K-D. Kammeyer. Data Aided Channel Estimation for Wireless MIMO-OFDM Systems M. Honglei, M.J. Juntti. Multi-User Transmissions for OFDM: Channel Estimation and Performances M. Chenu-Tournier, A. Renoult, I. Fijalkow. Adaptive Pilot Symbol Aided Channel Estimation for OFDM Systems S. Sand, A. Dammann, G. Auer. Exploiting A-Priori Information for Channel Estimation in Multiuser OFDM Mobile Radio Systems I. Maniatis, T. Weber, M. Weckerle. Timing of the FFT-Window in SC/FDE Systems A. Koppler, M. Huemer, A. Springer, R. Weigel. Equalization for Multi-Carrier Systems in Time-Varying Channels S. Gligorevic, R.

Multi-carrier spread-spectrum : for future generation wireless systems, fourth international workshop, Germany, September 17-19, 2003

Verfahren
zur gleichzeitigen Funkubertragung
digitaler Daten zwischen mehreren Teilnehmerstationen und einer
Basisstation, bei dem sendeseitig vor der Ubertragung die digitalen Datenstrome einer
Teilnehmerstation mit einer Spreizsequenz uberlagert und damit bandgespreizt
werden und dann auf einer Teilmenge von Untertragern innerhalb eines Mehrtrager-Frequenzbandes aufmoduliert ubertragen
werden, wobei die den einzelnen Teilnehmerstationen zugeordneten
Teilmengen an Untertragern
disjunkt und uber
das gesamte Frequenzband verteilt sind oder Gruppen oder eine Gruppe
von im Ubertragungsfrequenzband
nebeneinander liegenden Untertragern
bilden, und bei dem empfangerseitig
die empfangenen digitalen Datenstrome mehrtragerdemoduliert und dabei hinsichtlich
der jeweiligen Teilnehmerstations-Untertrager getrennt werden und die
informationstragenden digitalen Daten einer Teilnehmerstation gemeinsam
unter Anwendung eines geeigneten entspreizenden Detektionsverfahrens
detektiert werden, dadurch gekennzeichnet, das die aus seriellen komplexen
Datensymbolen bestehenden informationstragenden digitalen Datenstrome einer
Teilnehmerstation sendeseitig blockweise seriell/parallel gewandelt
werden, das jedes
der maximal L komplexen Datensymbole des in Parallelform vorliegenden
Blocks mit einer Spreizsequenz der Lange L (L Chips) multipliziert
wird und jeweils pro...

Khaled Fazel

Papers

Method of simultaneous radio transmission of digital data between a plurality of subscriber stations and a base station

Techniques for data transmission using high-order modulation

Multi-Carrier Systems & Solutions 2009: Proceedings from the 7th International Workshop on Multi-Carrier Systems & Solutions, May 2009, Herrsching, Germany

Multi-carrier spread-spectrum : for future generation wireless systems, fourth international workshop, Germany, September 17-19, 2003

Verfahren zur gleichzeitigen Funkübertragung digitaler Daten zwischen mehreren Teilnehmerstationen und einer Basisstation