Designing a wireless communication System Presented by: Shalini Kapoor MacArthur HS,Aldine ISD Faculty Mentor: Dr. Tie Liu Dr. Tie Liu “Information theory & coding for wireless broadcast network” “Information theory & coding for wireless broadcast network” Grad. Assistance: Neeharika Marukala Neeharika Marukala

History of communication The history of communication began with the use of visual signals like smoke signals, torch signals and flashing mirrors.

Those early communication techniques were replaced by telegraph invented by Thomas Edison in 18 th century.

History contd.. In 1870 Alexander Graham Bell invented telephone. In 1870 Alexander Graham Bell invented telephone. In 1896, Marconi demonstrated the first radio transmission and radio commission was born.

Wireless communication introduction Wireless communication is the transfer of information over a distance without the use of enhanced electrical conductors or wires. Wireless communication is the transfer of information over a distance without the use of enhanced electrical conductors or wires. It permits the services such as long range communications, that are impossible or impractical to implement with the wires. It permits the services such as long range communications, that are impossible or impractical to implement with the wires.

Where we use wireless communication Examples of wireless technology include GPS, Garage door opener, computer peripherals, computer networks, television remote controls, Internet, modem, bluetooth, Wi-Fi and security systems. Examples of wireless technology include GPS, Garage door opener, computer peripherals, computer networks, television remote controls, Internet, modem, bluetooth, Wi-Fi and security systems. Cellular phone systems Cellular phone systems have experienced exponential growth over last decade.

Bandwidth Wireless communication uses electromagnetic transmission. Wireless communication uses electromagnetic transmission. Electromagnetic transmission operates over a range of spectrum. Electromagnetic transmission operates over a range of spectrum. This range of spectrum is Bandwidth which is a key concept in wireless communication systems. This range of spectrum is Bandwidth which is a key concept in wireless communication systems.

Bandwidth Bandwidth is a valuable and limited resource. Bandwidth is a valuable and limited resource. For example, a FM radio receiver’s tuner spans a limited range of frequencies ( mHz). For example, a FM radio receiver’s tuner spans a limited range of frequencies ( mHz). FCC, a government agency in US apportions regionally available bandwidths to licensed broadcasters so that their signals do not interfere. FCC, a government agency in US apportions regionally available bandwidths to licensed broadcasters so that their signals do not interfere. Each transmitter owns a slice of bandwidth. Each transmitter owns a slice of bandwidth. Bandwidth is a highly regulated commodity and it is highly expensive. Bandwidth is a highly regulated commodity and it is highly expensive.

Impact of Bandwidth Basic Communication Setup Basic Communication Setup Pulse shaping filter Pulse shaping filter

Basic Communication Setup Information Source Destination Transmitter Modulator Receiver Demodulator Channel DAC Digital analog Converter ADC Analog Digital converter Physical Medium bits waveform voltage bits voltage waveform Distortion

Pulse shaping filter The voltages are converted into waveforms using a pulse shaping filter. The voltages are converted into waveforms using a pulse shaping filter. This is the place where bandwidth comes into play. This is the place where bandwidth comes into play. Its purpose is to make transmitted signal better suited to the communication channel by limiting the effective bandwidth of the transmission. Its purpose is to make transmitted signal better suited to the communication channel by limiting the effective bandwidth of the transmission.

Sinc Pulse Shaping Filter Time Domain Time Domain Frequency domain

Raised Cosine Pulse Shaping Filter Time domain Time domain Frequency domain

Research Activities Given a bandwidth, the number of channel uses per second is fixed. Given a bandwidth, the number of channel uses per second is fixed. The goal of transmitter/receiver design is to maximize the number of bits that can be reliably communicated per channel use. The goal of transmitter/receiver design is to maximize the number of bits that can be reliably communicated per channel use. Reliable communication in the presence of noise. Reliable communication in the presence of noise.

Design objectives Energy efficient Energy efficient Bandwidth efficient Bandwidth efficient Reliable Reliable The energy spent on transmission is proportional to the number of bits transmitted. The number of bits transmitted is proportional to the channel uses. The probability of error decreases as a function of the number of bits transmitted.

Acknowledgement I acknowledge my sincere thanks to E3 program coordinators to give me opportunity to come along with this wonderful experience and to enhance my knowledge in Engineering which will help to motivate my students to choose “Engineering” as their career. I acknowledge my sincere thanks to E3 program coordinators to give me opportunity to come along with this wonderful experience and to enhance my knowledge in Engineering which will help to motivate my students to choose “Engineering” as their career. I would like to thank National Science Foundation(NSF), Nuclear Power Institute(NPI), Texas Workforce Commission(TWC) and Chevron for their support to this program. I would like to thank National Science Foundation(NSF), Nuclear Power Institute(NPI), Texas Workforce Commission(TWC) and Chevron for their support to this program. Finally I would like to thank Dr. Liu and Neeharika, whose continual support led to this presentation. Finally I would like to thank Dr. Liu and Neeharika, whose continual support led to this presentation.