The communication needs of Earth observation satellites is steadily increasing. Within a few
years, the data rate of such satellites will exceed 1 Gbps, the angular resolution of sensors will be
less than 1 μrad, and the memory size of onboard data recorders will be beyond 1 Tbytes.
Compared to radio frequency links, optical communications in space offer various advantages
such as smaller and lighter equipment, higher data rates, limited risk of interference with other
communications systems, and the effective use of freque ....etc

[:=Read Full Message Here=:]

AN ADVANCED MAC PROTOCOL MIMO WLANS


INTRODUCTION
WLANS can be largely benefited by utilizing distributed spatial multiplexing gain that can be achieved by cancelling multiuser interference using multiple antennas at transmitter/receiver side. However, the distributed coordination function (DCF) which is the fundamental channel access method of IEEE 802.11n is based on CSMA/CA and thereby prevents the distributed spatial multiplexing by collision avoida ....etc

[:=Read Full Message Here=:]

Multiple-input multiple-output (MIMO) communication techniques make use of multi-element antenna arrays at both the TX and the RX side of a radio page link and have been shown theoretically to drastically improve the capacity over more traditional single-input multiple output (SIMO) systems . SIMO channels in wireless networks can provide diversity gain, array gain, and interference canceling gain among other benets. In addition to these same advantages, MIMO links can offer a multiplexing gain by opening Nmin parallel spatial chann ....etc

[:=Read Full Message Here=:]

We present a new model for multiple input multiple-output (MIMO) out door wireless fading channels which is more general and realistic than the usual i.i.d. model. We investigate the channel capacity as a function of parameters such as the local scattering radius at the transmitter and the receiver, the distance between the transmit (TX) and receive (RX) arrays, and the antenna beamwidth sand spacing. We point out the existence of pinhole channels which exhibit low fading correlation between antennas but still have poor rank properties and hen ....etc

[:=Read Full Message Here=:]

MIMO Technology for
Advanced Wireless Local Area Networks



Jeffrey M. Gilbert
Atheros Commications, Inc.
529 Almanor Ave
Sunnyvale, CA 94085
(1) 408-773-5261
Won-Joon Choi
Atheros Commications, Inc.
529 Almanor Ave
Sunnyvale, CA 94085
(1) 408-773-5334
Qinfang Sun
Atheros Commications, Inc.
529 Almanor Ave
Sunnyvale, CA 94085
(1) 408-773-5311



abstract

This paper first gives a brief introduction to Multiple Input Multiple Output (MIMO) wireless communication systems. Various ....etc

[:=Read Full Message Here=:]

MIMO Wireless Channels

Multiple-input multiple-output (MIMO) communication techniques make use of multi-element antenna arrays at both the TX and the RX side of a radio page link and have been shown theoretically to drastically improve the capacity over more traditional single-input multiple output (SIMO) systems . SIMO channels in wireless networks can provide diversity gain, array gain, and interference canceling gain among other benets.

In addition to these same advantages, MIMO l ....etc

[:=Read Full Message Here=:]

Abstract
Improved space“time coding for multiple-input and multiple-output orthogonal frequency division multiplexing is studied for wireless systems using QPSK modulation for four transmit and four receive antennas. A 256-state code is shown to perform within 3 dB of outage capacity (and within 2 dB with perfect channel estimation), which is better than any other published result without using iterative decoding. ....etc

[:=Read Full Message Here=:]

please download book.Hi am ASHWINI i would like to get details on advanced communications systems book for diploma to download .. ....etc

[:=Read Full Message Here=:]

ABSTRACT

With the ever growing demand of data applications, traditional cellular networks face the challenges of providing enhanced system capacity, extended cell coverage, and improved minimum throughput in a cost-effective manner. Wireless relay stations, especially when operating in a halfduplex operation; make it possible without incurring hi ....etc

[:=Read Full Message Here=:]

MIMO RADAR SIGNAL PROCESSING:MIMO as a Distributed Radar System
ABSTRACT:

Multiple-input multiple-output (MIMO) radar has been receiving increasing attention in recent years from researchers, practitioners, and funding agencies. MIMO radar is characterized by using multiple antennas to simultaneously transmit diverse (possibly linearly independent) waveforms and by utilizing multiple antennas to receive the reflected signals. Like MIMO communications, MIMO radar offers a new paradigm for signal processing research. MIMO radar possesses sig ....etc

[:=Read Full Message Here=:]