MICROWAVE SYSTEMULTRA-WIDEBAND

Mohammed AL Donbok

Dr. Allam Mousa

Introduction

Properties

Matlab

Technique Of UWB

Challenges

Application

Introduction• Historically, UWB radar systems were developed mainly as

a military tool (accurate radar and low probability of intercept communications)

• Ideal targets for UWB systems are low power, low cost, high data rates, precise positioning capability and extremely low interference.

• The typical sinusoidal radio wave is replaced (carrier-free ) by trains of pulses at hundreds of millions of pulses per second. The wide bandwidth and very low power makes UWB transmissions appear as background noise.

UWB AND SHANNON’S THEORY

• C is the maximum channel capacity [bits/second].

• B is the channel bandwidth [Hz].• S is the signal power in watts [W]..• N is the noise power[W]

way of looking at wireless communication is the tradeoffs between:1.The distance between transmitter and receiver2.Simultaneous communication for many users3. sending the data very quickly4.sending and receiving a large amount of data

But at the expense of, in the main, distance

Basic properties of UWB1. POWER SPECTRAL DENSITY2. PULSE SHAPE3. PULSE TRAINS4. SPECTRAL MASKS5. MULTIPATH6. PENETRATION CHARACTERISTICS7. SPATIAL AND SPECTRAL CAPACITIES8. SPEED OF DATA TRANSMISSION9. COST10. SIZE11. POWER CONSUMPTION

1- POWER SPECTRAL DENSITY

• The power spectral density (PSD) is defined as

where P is the power transmitted in watts (W), B is the

bandwidth of the signal in hertz (Hz), and the unit of PSD is watts/hertz (W/Hz).

• One of the benefits of low-power spectral density is a low probability of detection, which is of particular interest for military applications.

2-PULSE SHAPE

MATLAB

3- PULSE TRAINS

4 - SPECTRAL MASKSFCC regulates UWB frequency range from 3.1GHz to 10.6GHz andtransmission power at a limitation of -41dBm/MHz.

5- MULTIPATH• In the real world objects between the transmitter

and the receiver cause the physical effects of reflection, absorption, diffraction, and scattering, and this gives rise to multiple paths.

6-PENETRATION CHARACTERISTICS

• One of the most important benefits of the UWB communication system that has been raised is the ability of pulses to easily penetrate walls, doors, partitions, and other objects in the home and office environment.

The penetration capabilities of UWB come

only from the lower frequency components .

7- SPATIAL AND SPECTRAL CAPACITIES

8- SPEED OF DATA TRANSMISSION

9- COST

The low component count leads to reduced cost, and smaller chip sizes invariably lead to low-cost systems. The simplest UWB transmitter could be assumed to be a pulse generator, a timing circuit, and an antenna.

10- SIZE

consumer electronics companies have targeted the size of the wireless circuit will be small enough to fit into a Memory Stick or SD Card

11- POWER CONSUMPTION

Comparative Study of Wireless Protocols

Modulation Technique• There are various baseband modulation schemes

that have been studied

• PPM and BPSK are good candidates for UWB • They have a better bit energy performance

than PAM or OOK.

UWB Transmitter

UWB Receiver

Challenges While UWB has many reasons to make it an exciting and useful technology for future wireless communications and many other applications, it also has some challenges which must be overcome :

•Regulatory problems

•Other challenges include the industry coming to agreed standards for interoperability of UWB devices.

Application1. Military applications 2. Time Domain UWB signal generator3. Home networking and home electronics4. XtremeSpectrum5. Intel Corporation6. Motorola7. Wisair

AND MORE….

Military applications

• As with many wireless communication technologies the military has been the major driving force behind the development of UWB. In particular, Radar applications have been developed by the military for many years.

Home networking and home electronic

WISAIR

• WISAIRWISAIR is a startup company based in Israel .• The most interesting technical feature of the Wisair

chipset is that it uses the multi-band approach, dividing the ultra wideband wireless channel spectrum into several narrower bands. In this chipset, there are 30 possible sub-bands, of which 1–15 can be used.

Wisair UBLINK Chipset

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