JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Digital Communications

Course Objectives

The objectives of this course are to make the student

• 1. Understand the concept of Spread Spectrum and study various types of Spread spectrum sequences and their generation.
• 2. Understand the principles of Code Division Multiple Access (CDMA) and use of Spread spectrum concept in CDMA
• 3. Understand various Code tracing loops for optimum tracking of wideband signals viz spread spectrum signals
• 4. Understand the procedure for synchronization of receiver for receiving the Spread spectrum signal.
• 5. Study the performance of spread spectrum systems in Jamming environment, systems with Forward Error Correction and Multiuser detection in CDMA cellular radio.

Course Outcomes

On completion of this course student will be able to

• 1. Generate various types of Spread spectrum sequences and can simulate CDMA system (Both Transmitter & Receiver).
• 2. Analyze the performance of Spread spectrum systems in Jamming environment and systems with Forward Error Correction.
• 3. Can provide detection and cancellation schemes for Multi-user’s in CDMA cellular radio.

UNIT - I

Introduction to Spread Spectrum Systems: Fundamental Concepts of Spread Spectrum Systems, Pseudo Noise Sequences, Direct Sequence Spread Spectrum, Frequency Hop Spread Spectrum, Hybrid Direct Sequence Frequency Hop Spread Spectrum, Code Division Multiple Access. Binary Shift Register Sequences for Spread Spectrum Systems Introduction, Definitions, Mathematical Background and Sequence Generator Fundamentals, Maximal Length Sequences, Gold Codes.

UNIT - II

Code Tracking Loops: Introduction, Optimum Tracking of Wideband Signals, Base Band Delay-Lock Tracking Loop, Tau-Dither Non- Coherent Tracking Loop, Double Dither Non-Coherent Tracking Loop.

UNIT - III

Initial Synchronization of the Receiver Spreading Code: Introduction, Problem Definition and the Optimum Synchronizer, Serial Search Synchronization Techniques, Synchronization using a Matched Filter, Synchronization by Estimated the Received Spreading Code.

UNIT - IV

Cellular Code Division Multiple Access (CDMA) Principles: Introduction, Wide Band Mobile Channel, The Cellular CDMA System, Single User Receiver in a Multi User Channel, CDMA System Capacity, Multi-User Detection in CDMA Cellular Radio, Optimal Multi-User Detection, Linear Suboptimal Detectors, Interference Combat Detection Schemes, Interference Cancellation Techniques.

R19 M.TECH. COMMUNICATION SYSTEMS

UNIT - V

Performance of Spread Spectrum Systems in Jamming Environments Spread Spectrum, Communication System Model, Performance of Spread Spectrum Systems without Coding. Performance of Spread Spectrum Systems with Forward Error Correction Elementary Block Coding Concepts, Optimum Decoding Rule, Calculation of Error Probability, Elementary Convolution Coding Concepts, Viterbi Algorithm, Decoding and Bit-Error Rate.

TEXT BOOKS:

• 1. Rodger E Ziemer, Roger L. Peterson and David E Borth - “Introduction to Spread Spectrum Communication- Pearson, 1st Edition, 1995.
• 2. Mosa Ali Abu-Rgheff – “Introduction to CDMA Wireless Communications.” Elsevier Publications, 2008.

REFERENCES:

• 1. George R. Cooper, Clare D. Mc Gillem - “Modern Communication and Spread Spectrum,” McGraw Hill, 1986.
• 2. Andrew j. Viterbi - “CDMA: Principles of spread spectrum communication,” Pearson Education, 1st Edition, 1995.
• 3. Kamilo Feher - “Wireless Digital Communications,” PHI, 2009.
• 4. Andrew Richardson - “WCDMA Design Handbook,” Cambridge University Press, 2005.
• 5. Steve Lee - Spread Spectrum CDMA, McGraw Hill, 2002. R19 M.TECH. COMMUNICATION SYSTEMS M.TECH.- I YEAR- I SEMESTER COMMUNICATION SYSTEMS