Design and Testbed Implementation of Blind Parameter Estimated OFDM Receiver

Chaudhari, MS and Kumar, S and Gupta, R and Kumar, M and Majhi, S (2022) Design and Testbed Implementation of Blind Parameter Estimated OFDM Receiver. In: IEEE Transactions on Instrumentation and Measurement, 71 .

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Abstract

Designing an intelligent or adaptive transceiver system is becoming a promising technology for upcoming generations of wireless communication systems due to its adaptivity, spectrum efficiency, and low-latency characteristics. However, there is no work available until now that characterizes and demonstrates complete adaptation in the physical layer for orthogonal frequency-division multiplexing (OFDM) systems. In this article, we propose and implement sequential blind parameter estimation methods for OFDM signals using radio frequency (RF) testbed setup in a realistic scenario. The estimations include the number of subcarriers, symbol duration, cyclic prefix, oversampling factor, symbol timing offset (STO), and carrier frequency offset (CFO). The proposed algorithms also include blind modulation classification for linearly modulated signals over a frequency-selective fading channel. The parameter estimation has been carried out through a cyclic cumulant process. The modulation formats are classified by using normalized fourth-order cumulant in the frequency domain. The STO and CFO are estimated by a proposed modified maximum likelihood algorithm. The performances of parameter estimations, modulation classification, and synchronization are measured through analytical, simulation, and measurement studies. The overall performance of the OFDM system is provided in terms of the received constellation diagram and bit error rate (BER) over an indoor propagation environment.

Item Type:	Journal Article
Publication:	IEEE Transactions on Instrumentation and Measurement
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	Bit error rate; Fading channels; Frequency allocation; Frequency domain analysis; Frequency estimation; Frequency selective fading; Maximum likelihood estimation; Modulation; Network layers; Orthogonal frequency division multiplexing; Radio transceivers; Testbeds, Adaptive receivers; Classification algorithm; Cumulants; Cyclic cumulants; Intelligent receiver; Ma ximum likelihoods; Maximum-likelihood; Modulation classification; Orthogonal frequency-division multiplexing; Receiver; Testbed implementation; Wireless communications, Timing circuits
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	08 Jul 2022 05:51
Last Modified:	08 Jul 2022 05:51
URI:	https://eprints.iisc.ac.in/id/eprint/74282

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