CDMA - Channelization

Duration: 4 min

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Module outline

  1. Quantitative Aptitude: Number System, Divisibility Rules, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Mixture and Alligation, Partnership, Age Problems, Time and Work, Pipe and Cistern, Speed Time and Distance, Algebra, Arithmetic, Data Interpretation, Sequence and Series (Series), Logarithm, Powers and Exponents (Surds and Indices), Permutation and Combination, Probability, Speed Mathematics and Basic Mathematics, Trigonometry
  2. Logical Reasoning: Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Seating Arrangements, Puzzle Solving (Puzzles), Data Arrangement, Syllogisms, Inequality, Data Sufficiency, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Venn Diagram, Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning)
  3. Verbal Ability: Noun, Pronoun, Adjectives, Verb, Adverb, Tenses, Subject Verb Agreement (Verb Noun Agreement), Articles, Preposition, Conjunction, Modals, Determiner, Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  4. Data Structures (Domain Test): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  5. Algorithms (Domain Test):
  6. OOPs (Domain Test): Object Oriented Programming (OOPS)
  7. DBMS (Domain Test): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  8. SQL (Domain Test): SQL
  9. Operating Systems (Domain Test): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  10. Computer Networks (Domain Test): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Cloud Computing and IoT, Cyber and Info Security
  11. Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  12. Written English Test: English Writing Ability
  13. Psychometric Test: Behavioral Assessment (Behavioral Competency Profiling) (Psychometric Test)
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces Code-Division Multiple Access (CDMA) as a channelization technique, contrasting it with Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA). The instructor uses 3D block diagrams to visualize how each method allocates resources across frequency, time, and power axes. FDMA divides bandwidth into distinct frequency slots for different users, while TDMA allocates specific time slots within a single frequency channel. CDMA is presented as distinct because it allows all stations to transmit simultaneously over the entire bandwidth using unique codes, eliminating timesharing. The instructor draws a circle containing 'F <-> E' and 'T <-> T' to illustrate the relationship between frequency, time, and energy in CDMA systems. Visual comparisons emphasize that unlike FDMA or TDMA, CDMA does not separate users by frequency bands or time intervals but rather by code sequences.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with an introduction to CDMA, displaying text stating 'Code-division multiple access (CDMA) was conceived several decades ago.' The instructor presents three 3D block diagrams labeled FDMA, TDMA, and CDMA to compare channelization methods. On-screen text explains that 'CDMA differs from FDMA because only one channel occupies the entire bandwidth of the link.' The instructor points to each diagram, highlighting that FDMA divides frequency slots while TDMA allocates time slots. A key visual cue shows the instructor drawing a circle and writing 'F <-> E' to illustrate frequency-energy relationships in CDMA systems.

  2. 2:00 – 4:08 02:00-04:08

    The instructor continues explaining CDMA's unique characteristics, emphasizing that 'all stations can send data simultaneously; there is no timesharing.' The slide displays three 3D block diagrams with axes labeled 'power,' 'time,' and 'frequency.' The instructor gestures toward the CDMA section, showing how all users occupy the full bandwidth simultaneously. A hand-drawn circle with arrows and letters representing signal paths appears to the right of the diagrams. The instructor points specifically at the CDMA block and accompanying sketch while explaining that unlike FDMA or TDMA, CDMA uses codes rather than frequency separation or time division to distinguish users.

The lecture establishes CDMA as a channelization technique where all stations transmit simultaneously over the entire bandwidth using unique codes. Unlike FDMA, which divides frequency slots, or TDMA, which allocates time slots, CDMA eliminates timesharing by allowing concurrent transmission. The instructor uses 3D block diagrams with power, time, and frequency axes to visualize these differences. Key evidence includes on-screen text stating 'CDMA differs from FDMA because only one channel occupies the entire bandwidth of the link' and 'all stations can send data simultaneously; there is no timesharing.' The instructor's hand-drawn circle with 'F <-> E' and 'T <-> T' illustrates the frequency-energy relationship in CDMA systems. This foundational concept sets up subsequent discussions on code sequences and signal processing techniques.

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