FLIPPED CLASSROOM ACTIVITY CONSTRUCTOR – USING EXISTING CONTENT

Table of Contents SECTION SLIDE # 5 9, ABOUT YOU 3 OUT-OF-CLASS SEGMENT 5 IN-CLASS SEGMENT 9,

About you Myself, Swati Mahajan, faculty in Electronics and Telecommunication Engineering Department. Orthogonal frequency Division Multiplexing is frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels. OFDM is used in LTE standard(Long Term Evolution).

Swati Mahajan Orthogonal Frequency Division Multiplexing Wireless Communications Electronics and Telecommunications Last Year U.G. Students K. J. Somaiya College of Engineering (Affiliated to Mumbai University)

Out-of-class Activity Design -1 Learning Objective(s) of Out-of-Class Activity At the end of watching the videos student should be able to Explain basic concept of OFDM (Understand Level) Calculate highest and lowest frequency possible to encode in sampling system in OFDM. (Apply Level) Key Concept(s) to be covered Inverse Fast Fourier Transform Sampling theorem

Out-of-class Activity Design - 2 https://www.youtube.com/watch?v=VhgkCoVYhBI https://www.youtube.com/watch?v=hiEGWIl4m6I Main Video Source URL License of Video Creative Commons Attribution license (reuse allowed) Mapping Concept to Video Source CONCEPT VIDEO SEGMENT DURATION (in min) Introduction to OFDM 0– 9.47 9.47 Highest and lowest frequency in particular system 0– 3.42 3.42 TOTAL DURATION 13.29 minute

Out-of-class Activity Design - 3 Aligning Assessment with Learning Objective Learning Objective Assessment Strategy Expected duration (in min) Additional Instructions (if any) To understand O.F.D.M. Q1. Which transform is used to create unique symbols with time or amplitude structure? A: FFT B: IFFT C: DFT Q2. To create symbols which carry information in every sample, is idea of OFDM A:True B:False 5 min Each question carry one mark . In-time submission will get due weightage in attendance.

Out-of-class Activity Design - 3 Aligning Assessment with Learning Objective Learning Objective Assessment Strategy Expected duration (in min) Additional Instructions (if any) To calculate lowest and highest frequency in sampled system Q1. What will be lowest frequency encoded if symbol duration is T mS? Q2. What will be highest frequency if sampling frequency (Fs) is 4kHz? 5 min Each question carry one mark. In-time submission will get due weightage in attendance.

In-class Activity Design -1 Learning Objective(s) of In - Class Activity At the end of the class, students will be able to, apply basic concept of OFDM. (ANALYZE Level) Key Concept(s) to be covered Orthogonality, Fourier transform

In-class Activity Design -2 Active Learning activity(ies) that you plan to do Peer Instruction Explain the strategy by giving details of What Teacher will do? Slide No: 11, 12 What Student will do? Slide No: 13 Justify why the above is an active learning strategy Enter Justification Here Slide No: 14

In-class Activity Design -2 Peer Instruction Strategy – What Teacher Does Pose the two PI questions at the start of the class and provide summary of basic identities and expression simplification. Q 1: What are some of the wireless technologies that use OFDM? Wireless LAN-eg. WiFi 4G cellular technology standard Long-Term Evolution (LTE)  Wideband wireless metro-area network (MAN) technology WiMAX  Ultra-Wideband (UWB) 

In-class Activity Design -2 Peer Instruction Strategy – What Teacher Does  Q 2: What is FFT? The FFT is a variation of the discrete Fourier transform (DFT). In general, you can take any analog signal, digitize it in an analog-to-digital converter (ADC), and then take the resulting samples and put them through the FFT process. The result is essentially a digital version of a spectrum analysis of the signal. The FFT sorts all the signal components out into the individual sine-wave elements of specific frequencies and amplitudes—a mathematical spectrum analyzer of a sort. That makes the FFT a good way to separate out all the carriers of an OFDM signal.

In-class Activity Design -2 Peer Instruction Strategy – What Student Does For first question they will first vote individually. Then they will discuss with peers and come to consensus. For second question, they will discuss with peers and come to consensus. Listen to instructors explanation.

In-class Activity Design -2 Justify why the above is an active learning strategy In above strategy, students are required to go beyond mere listening and execution of prescribed steps. Student have to apply mathematical concept in understanding OFDM.