Moshe Ran

Ultra-Wideband Radio-Over-Optical Fiber Concepts, Technologies and Applications

We have developed novel ultra-wideband (UWB) radio-over-optical-fiber (UROOF) concepts and technologies for a number of important in-house applications characterized by a high data rate. We propose the novel components, architecture, and realization of UWB UROOF systems. We present new experimental results related to UWB signal up-conversion, photonic radio impulse generation, and digital and analog signal coexistence. We also discuss future trends in the field of UWB UROOF technologies.

Constrained designs for maximum likelihood soft decoding of RM(2,m) and the extended Golay codes

We present algorithms for maximum likelihood soft decoding of the second order Reed-Muller codes RM(2,m) and the extended (24,12,8) Golay code. The decoding procedures are based on a concise representation of appropriately selected cosets of a subcode of the code considered. Such representation enables application of certain elimination rules. A structure, called constrained design, is established to support the elimination procedures. Remarkably efficient algorithms are obtainable by this approach. The method of elimination is applicable also in combination with existing coset decoding schemes. >

Proposal for All-Optical Generation of Ultra-Wideband Impulse Radio Signals in Mach–Zehnder Interferometer With Quantum-Dot Optical Amplifier

We developed a theoretical analysis of a novel method of ultra-wideband impulse radio signals all-optical generation based on cross-phase modulation and cross-gain modulation in a nonsymmetric integrated Mach-Zehnder interferometer (MZI) containing quantum-dot semiconductor optical amplifier. The proposed method is promising due to the advantages of compact, easily controlled, and low energy integrated MZI structures as compared to optical fiber systems.

On maximum likelihood soft decoding of some binary self-dual codes

Efficient algorithms are derived for maximum likelihood (ML) soft-decision decoding of some binary self-dual codes. A family of easily decodable self-dual codes is derived by modifying a known F/sub 24/, which has a weight distribution resembling that of the (24, 12, 8) Golay code G/sub 24/. The ML decoding of F/sub 24/ is accomplished by only 227 real additions, compared to 651 required for G/sub 24/, yet the error rates of the two decoders are similar for moderate noise conditions. >

Wimedia-Defined, Ultra-Wideband Radio Transmission over Optical Fibre

We demonstrate combined wireless and optical fibre channel transmission of Wimedia- defined, MB-OFDM, UWB radio by directly modulation of 4.8GHz VCSELs. Range extension to 400m for multi-cell HDTV sharing is achievable with low-cost remote antenna units.

Efficient decoding of the Gosset, Coxeter-Todd and the Barnes-Wall lattices

Low complexity maximum-likelihood and bounded-distance soft decoding algorithms are presented for several block and lattice codes. The bounded-distance algorithms are based upon multilevel constructions of the codes. To demonstrate the approach, maximum-likelihood and bounded-distance decoders are devised for several well known codes and sphere packings in 8, 12 and 16 dimensions.

Error Control Coding for B3G/4G Wireless Systems: Paving the Way to IMT-Advanced Standards

About the Editors. Contributors. Preface. Acknowledgments. Abbreviations. 1. Coding (Gerhard Bauch, Claude Berrou, David Declercq, Aledandre Graell I. Amat, Youssouf Ould-Cheikh-Mouhamedou, Yannick Saouter, Jossy Sayir, and Marcos B. S. Tavares). 1.1 General Code Types. 1.2 Designing Code Based on Graphs. 1.3 Pseudorandom Designs. 1.4 Repeat Accumulate Codes. 1.5 Binary versus Nonbinary. 1.6 Performance Results of Nonbinary LDPC Codes. 1.7 Three-Dimensional (3D) Turbo Codes. 1.8 Conclusions. 2. Decoding (Moshe Ran, Carlos De Segovia, and Omer Ran). 2.1 Algebraic Soft-Decision (ASD) and Reliability-Based Decoders. 2.2 Graph versus Trellis Decoding Algorithms. 3. Incremental Redundancy for Coding (Stefania Sesia and Charly Pouliat). 3.1 Introduction. 3.2 Retransmission Protocols (ARQ). 3.3 HARQ Schemes. 3.4 Design of Hybrid ARQ Type II. 3.5 Code Design. 3.6 Generalization of the Mutual Information Evolution for Incremental Redundancy Protocols. 3.7 ARQ/HARQ in the Standards. 3.8 Conclusions. 4. Architecture and Hardware Requirements (Frank Kienle). 4.1 Turbo Decoder Implementation. 4.2 LDPC Decoder Architectures. 5. Turbo-Principle Extensions (Isabelle Siaud, Ming Jiang, Anne-Marie Ulmer-Moll, Maryline Helard, Thierry Lestable, and Carlos De Segovia). 5.1 Introduction. 5.2 From Turbo Code to Advanced Iterative Receivers. 5.3 Turbo-Based Interleaving Techniques. 5.4 Turbo-MIMO Techniques. 5.5 Conclusions. 6. Standardization (Marie-Helene Hamon, Thierry Lestable, and Isabelle Siaud). 6.1 3GPP Systems: UMTS and LTE. 6.2 IEEE 802.16/WiMAX. 6.3 IEEE 802.1 1n. 6.4 Satellite (DVB-RCS, DVB-S2). 6.5 Wireless Rural Area Network: The IEEE802.22 standard [IEEE802-22]. 6.6 Others. Index.

Bi-directional, 480Mbps, ultra-wideband, radio-over-fibre transmission using a 1310/1564nm reflective electro-absorption transducer and commercially-available components

We present the first experimental demonstration of a bi-directional, reflective, electro-absorption transducer-based, 480 Mbps UWB-wireless/optical transmission system. A -21.4 dB error vector magnitude was observed over 1 km of single mode fibre.

A cyclic [6,3,4] group code and the hexacode over GF(4)

A [6,3,4] code E/sub 6/ over an Abelian group A/sub 4/ with four elements is presented. E/sub 6/ is cyclic, unlike the [6,3,4] hexacode H/sub 6/ over GF(4). However, E/sub 6/ and H/sub 6/ are isomorphic when the latter is viewed as a group code. Differences and similarities between E/sub 6/ and H/sub 6/ are discussed. A dual code of E/sub 6/ is presented. Some binary codes, among them the [24,12,8] Golay, are derived with the aid of E/sub 6/. A related cyclic [4,2,3] code E/sub 4/* is applied to construct the Nordstrom-Robinson code. E/sub 6/ is the smallest member of a class of [2k,k,4] cyclic and reversible codes over A/sub 4/. Another class of cyclic and reversible codes of length 2l+1; l/spl ges/2 and minimum distance 3 over A/sub 4/ is also presented.

Up-Conversion of Triple-Band OFDM UWB Signals by a Multimode VCSEL

We present novel experimental results for the all-optical up-conversion of the triple-band orthogonal frequency-division-multiplexing ultra-wideband radio signals from lower frequency band group 1 up to higher frequency band groups 2 or 3 based on the vertical-cavity surface-emitting laser optical second- and third-order nonlinearities. Low conversion losses and error vector magnitude values, respectively, for low bias currents have been demonstrated.