Multipath Transmission and Doppler Effects - Engineering Assignment Help

Assignment Task :

Project Description: Multipath transmission and Doppler effects are two critical problems that need to be solved in the high-speed or high frequency wireless communication systems, especially in the forthcoming 5G / beyond 5G mobile networks. In order to tackle those inherent wireless channel fading problems, new modulation and waveform schemes utilizing multiple dimensional physical resources together such as time, frequency and space are needed. To this end, orthogonal time frequency space (OTFS) modulation has recently been proposed by the world known experts in wireless communications [1]-[6]. OTFS deploys the delay-Doppler domain rather than time-frequency domain for data transmission. However, the challenge in OTFS signal detection is to deal with the inter-symbol interference (ISI) in both delay and Doppler dimensions that is caused by the time-varying wireless channels. To deal with this issue, the current project utilizes a massive number of receive antennas, i.e. massive MIMO receiver, in conjunction with time-reversal combining. In particular, this project will apply a procedure like time-reversal combining in delay and Doppler domain. This solution is similar to the one that was recently proposed in [7] for the orthogonal frequency division multiplexing (OFDM). 

Required Technical Competencies (Indicative): Strong programing skills (MATLAB), Signal Processing, Wireless Communications, Digital Modulation and Coding. 

Additional Desirable Prerequisites: Some idea about OFDM. 

Expected Procedure (indicative): The student will be expected to: 

1. Draw up a complete problem description and identify work packages.

2. Implement OFDM-based OTFS in MATLAB for the single antenna case and draw a snapshot of the equivalent channel response in the delay-Doppler domain.

3. Implement OFDM with cyclic prefix (CP) for massive MIMO under time invariant channel conditions.

4. Regenerate the results of [7] for OFDM without CP in massive MIMO channels.

5. Study and implement OFDM-based OTFS in MATLAB for massive MIMO using two dimensional matched filter in the delay-Doppler domain. Provide a snapshot of the equivalent channel after 2D matched filter combining.

6. Repeat step 5 for OTFS using different window functions at the receiver and/or transmitter side. 

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