JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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.

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.

REFERENCE BOOKS:

• 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. M. TECH. I YEAR I SEMESTER COMPUTER AND COMMUNICATION ENGINEERING WIRELESS COMMUNICATIONS AND NETWORKS LAB (Laboratory I)

Note:

A. Minimum of 10 Experiments have to be conducted B. All Experiments may be Simulated using MATLAB (or any equivalent software) and to be verified using related training kits.

• 1. Determination of output of convolution Encoder for a given sequence
• 2. Determination of output of convolution Decoder for a given sequence
• 3. Efficiency of DS Spread- Spectrum Technique
• 4. Simulation of Frequency Hopping (FH) Spread- Spectrum
• 5. Optimum receiver for the AWGN channel.
• 6. Measurement of effect of Inter Symbol Interference.
• 7. Simulation of PSK system with M=4
• 8. Simulation of DPSK system with M=4
• 9. Design of FSK system
• 10. BPSK Modulation and Demodulation techniques
• 11. QPSK Modulation and Demodulation techniques
• 12. DQPSK Modulation and Demodulation techniques
• 13. 8-QAM Modulation and Demodulation techniques
• 14. OFDM Transceiver design
• 15. Performance evaluation of simulated CDMA system
• 16. Implementation of QPSK Modulation with Rayleigh Fading and AWGN channel