There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Table Of Integrals Series And Products

The use of infrared radiation as a medium for high-speed short-range wireless digital communication is discussed. Available infrared links and local-area networks are described. Advantages and drawbacks of the infrared medium are compared to those of radio and microwave media. The physical characteristics of infrared channels using intensity modulation with direct detection (IM/DD) are presented including path losses and multipath responses. Natural and artificial ambient infrared noise sources are characterized. Strategies for designs of transmitter and receivers that maximize link signal-to-noise ratio (SNR) are described. Several modification formats are discussed in detail, including on-off keying (OOK) pulse-position modulation (PPM), and subcarrier modulation. The performance of these techniques in the presence of multipath distortion is quantified. Techniques for multiplexing the transmissions of different users are reviewed. The performance of an experimental 50-Mb/s on-off-keyed diffuse infrared link is described.

Wireless Infrared Communications

It is shown that, particularly for terrestrial cellular telephony, the interference-suppression feature of CDMA (code division multiple access) can result in a many-fold increase in capacity over analog and even over competing digital techniques. A single-cell system, such as a hubbed satellite network, is addressed, and the basic expression for capacity is developed. The corresponding expressions for a multiple-cell system are derived. and the distribution on the number of users supportable per cell is determined. It is concluded that properly augmented and power-controlled multiple-cell CDMA promises a quantum increase in current cellular capacity. >

On the capacity of a cellular CDMA system

We review the field of femtosecond pulse shaping, in which Fourier synthesis methods are used to generate nearly arbitrarily shaped ultrafast optical wave forms according to user specification. An emphasis is placed on programmable pulse shaping methods based on the use of spatial light modulators. After outlining the fundamental principles of pulse shaping, we then present a detailed discussion of pulse shaping using several different types of spatial light modulators. Finally, new research directions in pulse shaping, and applications of pulse shaping to optical communications, biomedical optical imaging, high power laser amplifiers, quantum control, and laser-electron beam interactions are reviewed.

Femtosecond pulse shaping using spatial light modulators

In this paper, we present signal construction for the future IEEE 40GBASE-T standard. The LDPC assisted coded modulation and demodulation is presented. A code achieving 6dB gain, which is literally high enough to satisfy reliability constraints for data transmission at a rate of 40 Gbps over 50m Cat-7A (class FA) copper cable, is designed and the simulation results are presented. The main objective of the presented work is to extensively reduce the power and implementation complexities of a 40GBASE-T system.

Signal construction for high-speed access over copper wiring

We present an algorithm to reduce the power consumption of single-carrier data transmission over twisted-pair copper cables for future IEEE networking physical connectivity standard, 40GBASE-T. High-complexity coding schemes employed for multi-gigabits transmission systems for higher reliability, e.g., system margin, is one of the major sources of power dissipation. The proposed method reduces the total power consumption by properly partitioning the channel into few sub-channels and using lower complexity coding schemes for the sub-channel with less insertion loss while the margin requirement is met over the entire channel.

Power minimization algorithm for high-speed access over copper: Multichannel approach

We consider a coded multiple-input multiple-output (MIMO) DS-CDMA system using layered space-time transmission in multipath wireless channels, where space-time signals from multiple antennas of multiple users propagate through rich scattering multipath fading. We propose a receiver employing iterative joint detection and decoding with a reduced-complexity detector using linear minimum mean squared error filtering with a priori information and parallel soft-input soft-output (SISO) decoders. Computer simulation results show that the proposed receiver for multi-user MIMO transmission provides high-spectral efficiency and performance approaching to single-user bound. Furthermore, the reduced-complexity receiver outperforms an iterative soft decision-directed maximal ratio combining (DD-MRC) receiver, RAKE receiver as well as a conventional non-iterative receiver.

An Iterative Receiver for Uplink of Coded MIMO DS-CDMA System Employing Layered Space-Time Transmission

This paper proposes an efficient adaptive-rate scheme in conjunction with retransmission and code combining for transmission of ATM cells over mobile cellular networks. Wireless channel is characterized by block-fading Rayleigh distribution, where it is assumed to be invariant during each block of data and fading is assumed to be independent from one block to another. The proposed scheme provides a large dynamic range and yields very low cell-error rates at almost all channel conditions (low outage probability) with at most two retransmissions. This makes the scheme suitable for real-time applications, such as constant-bit-rate (CBR) applications intended for use in ATM circuit emulation mode l9r. Furthermore, it saves a considerable amount of power as compared to fixed rate schemes with the same spectral efficiency and outage.

An Efficient ATM Cell Transmission Scheme Over Mobile Cellular Networks

This chapter analyzes different indoor channel impulse responses and their Fourier transforms, and the frequency responses of the channels. It shows that the size of the room and the positions of transmitters and receivers have a big influence on their achievable performance. The chapter shows that line‐of‐sight (LOS) channels have better ‐3 dB bandwidth and smaller root‐mean‐square (rms) delay spread compared to NLOS channels. It explains the effects of adding furniture in a room. The conclusion is that if the receiver location is not near some furniture which is at a higher height than the receiver itself, the results obtained from analyzing an empty room can be used interchangeably without introducing too many significant errors. Lastly, signal‐to‐noise ratio (SNR) calculations are used to show that using a bare photodiode, even an avalanche photodiode (APD), will not be good enough to obtain sufficient SNR to ensure a bit‐error‐rate (BER) of 10‐6.

Mohsen Kavehrad

Papers

Signal construction for high-speed access over copper wiring

Power minimization algorithm for high-speed access over copper: Multichannel approach

An Iterative Receiver for Uplink of Coded MIMO DS-CDMA System Employing Layered Space-Time Transmission

An Efficient ATM Cell Transmission Scheme Over Mobile Cellular Networks

Analyses of Indoor Optical Wireless Channels Based on Channel Impulse Responses