Principles of Modern CDMA/ MIMO/ OFDM Wireless Communications | EveryEng

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Principles of Modern CDMA/ MIMO/ OFDM Wireless Communications

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659 min

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Why enroll

Participants join this course to understand how today’s fast mobile networks really work behind the scenes. It helps students and professionals learn the basic ideas used in 3G and 4G systems without getting confused by heavy theory. The course builds strong fundamentals in important technologies like CDMA, OFDM, and MIMO, which are essential for careers in wireless communication, telecom, and networking. Many learners also take this course to prepare for higher studies, competitive exams, or industry roles related to mobile networks and broadband wireless systems.

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Is this course for you?

You should take this if

You work in Automotive
You're a Electrical Engineering professional
You have 3+ years of hands-on experience in this field
You want to build skills in Engineering & Design, Project Management

You should skip if

You're new to this field with no prior experience
You need a different specialisation outside Electrical Engineering
You need live interaction with an instructor

Course details

Wireless communication has changed a lot in the last few years. Earlier, 2G systems like GSM could only send data at very slow speeds of about 10 Kbps. Today, modern wireless systems can deliver very high-speed internet, even more than 100 Mbps. This huge improvement led to advanced technologies like 3G and 4G, including HSDPA, LTE, and WiMAX. These high speeds are possible because of smart technologies such as CDMA, OFDM, and MIMO. These methods help many users communicate at the same time, improve data speed, and make better use of available bandwidth. This course explains these core technologies clearly and helps learners understand how modern 3G and 4G wireless systems actually work.

Source: NOC July–Sep EC05 [Youtube Channel] NPTEL

Course suitable for

Key topics covered

Introduction to modern wireless communication systems
Evolution from 2G to 3G and 4G technologies
Basics of wireless channels and propagation
Noise, interference, and fading concepts
Digital modulation basics for wireless systems
Multiple access techniques overview
Fundamentals of CDMA technology
CDMA codes and multiple access interference
Power control and capacity in CDMA systems
Introduction to OFDM concept
OFDM structure using FFT and IFFT
Advantages and limitations of OFDM
Introduction to MIMO wireless systems
MIMO diversity and spatial multiplexing
Use of CDMA, OFDM, MIMO in 3G/4G systems

Course content

The course is readily available, allowing learners to start and complete it at their own pace.

30 lectures10 hr 59 min

Principles of Modern CDMA/MIMO/OFDM Wireless Communications
4 min
Evolution of Wireless Communication Technologies
23 min
Modeling Wireless Channel
23 min
Wireless Fading Channel Model
23 min
Rayleigh Fading Channel
12 min
Bit Error Rate (BER) Performance
23 min
Bit Error Rate (BER) of AWGN Channels
22 min
Bit Error Rate of Rayleigh Fading Wireless Channel
30 min
Exact BER Expression for Rayleigh Fading Wireless Channel
19 min
Deep Fade Analysis of Wireless Communication
22 min
Principle of Diversity
15 min
Multiple Antenna Diversity
29 min
Maximal-Ratio Combining
19 min
BER of Multiple Antenna Wireless Systems
24 min
Approximate BER for Multiple Antenna Wireless System
15 min
Examples for BER of Wireless Communication
22 min
Deep Fade in Multi Antenna Systems
23 min
Intuition for Deep Fade in Multi-Antenna System
32 min
Definition of Diversity Order
18 min
Max Delay Spread
21 min
RMS Delay Spread
26 min
Delay Spread and Inter Symbol Interference
28 min
Coherence Bandwidth of Wireless Channel
26 min
Mobility and Doppler Effect in Wireless Channels
18 min
Impact of Doppler Effect on Wireless Channel
16 min
Introduction to Code Division Multiple Access (CDMA)
27 min
Chip Time and Bandwidth Expansion in CDMA
12 min
Code Generation for CDMA
23 min
CDMA Codes: Properties of PN Sequences
35 min
BER of CDMA Systems
29 min

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Research & Developmnet

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Questions and Answers

Q: You're debugging a link budget issue and google "OFDM subcarrier spacing increased effect on EVM and ICI". Subcarrier spacing is doubled while CP length is held constant in time. What happens at the receiver, and what's the right corrective action?

A: The correct answer preserves orthogonality while keeping multipath contained in the guard interval. Option A misses that CP coverage is a time-domain requirement and equalizer length doesn't fix ISI from CP underrun. Option C conflates phase noise with subcarrier spacing and ignores the CP mismatch. Option D addresses CFO estimation but leaves the physical ISI mechanism untouched.

Q: Field data shows packet loss spikes at highway speeds and you search "MIMO antenna correlation failure mode spatial diversity". One antenna feed develops a partial short to chassis. What does spatial diversity NOT protect you from in this case?

A: The correct answer isolates a hardware-induced noise path that diversity can't average out. Option A is exactly what diversity is meant to mitigate when feeds are intact. Option C is reduced statistically by multiple branches even at high speed. Option D is another impairment diversity is designed to tolerate within limits.

Q: You're reviewing a RF front-end schematic and google "CDMA duplexer insertion loss spec typical vs max". The drawing calls out 1.2 dB IL with no qualifier. What assumption is unsafe for link margin sign-off?

A: The correct answer avoids understating worst-case sensitivity loss. Option B is mathematically sound once the correct loss value is chosen. Option C may be wrong in detail but doesn't directly hide margin. Option D is the conservative placement for NF accounting.

Q: You're tuning a closed-loop MIMO link and search "increase MCS without changing SNR BLER rises". The scheduler bumps modulation order but leaves coding rate unchanged. BLER spikes. What's the correct response?

A: The correct answer restores decoding margin without stressing RF limits. Option A may violate PA linearity and masks the real trade. Option C helps estimation error but doesn't fix symbol decision spacing. Option D treats the symptom and burns latency.