Kasturi Vasudevan

Indian Institute of Technology Kanpur India

K. Vasudevan completed his Bachelor of Technology (Honours) from the department of Electronics and Electrical Communication Engineering, IIT Kharagpur, India, in the year 1991, and his M.S. and Ph.D. from the department of Electrical Engineering, IIT Madras, in the years 1996 and 2000 respectively. During 1991–1992, he was employed with Indian Telephone Industries Ltd, Bangalore, India. He was a Post Doctoral Fellow at the Mobile Communications Lab, EPFL, Switzerland, between Dec. 1999 and Dec. 2000, and an engineer at Texas Instruments, Bangalore, between Jan 2001 and June 2001. Since July 2001, he has been a faculty at the Electrical department at IIT Kanpur, where he is now a Professor. His interests lie in the area of communications and signal processing.

2chapters authored

Chapters authored

Coherent Receiver for Turbo Coded Single-User Massive MIMO-OFDM with Retransmissions

By K. Vasudevan, Shivani Singh and A. Phani Kumar Reddy

Single-user massive multiple-input multiple-output (MIMO) systems have a large number of antennas at the transmitter and receiver. This results in a large overall throughput (bit-rate), of the order of tens of gigabits per second, which is the main objective of the recent fifth-generation (5G) wireless standard. It is feasible to have a large number of antennas in mm-wave frequencies, due to the small size of the antennas. This chapter deals with the coherent detection of orthogonal frequency division multiplexed (OFDM) signals transmitted through frequency-selective Rayleigh fading MIMO wireless channels. Low complexity, discrete-time algorithms are developed for channel estimation, carrier and timing synchronization, and finally turbo decoding of the data at the receiver. Computer simulation results are presented to validate the theory.

Part of the book: Multiplexing

New Results on Single User Massive MIMO

By Kasturi Vasudevan, Surendra Kota, Lov Kumar and Himanshu Bhusan Mishra

Achieving high bit rates is the main goal of wireless technologies like 5G and beyond. This translates to obtaining high spectral efficiencies using large number of antennas at the transmitter and receiver (single user massive multiple input multiple output or SU-MMIMO). It is possible to have a large number of antennas in the mobile handset at mm-wave frequencies in the range 30–300 GHz due to the small antenna size. In this work, we investigate the bit-error-rate (BER) performance of SU-MMIMO in two scenarios (a) using serially concatenated turbo code (SCTC) in uncorrelated channel and (b) parallel concatenated turbo code (PCTC) in correlated channel. Computer simulation results indicate that the BER is quite insensitive to re-transmissions and wide variations in the number of transmit and receive antennas. Moreover, we have obtained a BER of 10−5 at an average signal-to-interference plus noise ratio (SINR) per bit of just 1.25 dB with 512 transmit and receive antennas (512 × 512 SU-MMIMO system) with a spectral efficiency of 256 bits/transmission or 256 bits/sec/Hz in an uncorrelated channel. Similar BER results have been obtained for SU-MMIMO using PCTC in correlated channel. A semi-analytic approach to estimating the BER of a turbo code has been derived.

Part of the book: MIMO Communications

Kasturi Vasudevan

Chapters authored

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