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A Design of Adaptive Space Time Frequency MIMO-OFDM with Nanotechnology

Sabeenian Royappan Savarimuthu, Angel Daniel and Manjunathan Alagarsamy


MIMO (Multiple-Input Multiple-Output) networks could be created for one of two functional purposes: either to reduce bit error rate (BER) or to enhance capability without using more bandwidth or power. In order to reduce inter-carrier interference (ICI) and enable dynamic switching among these two modalities in wireless fading channels, MIMO space-time-frequency (STF) conjugated two-path transmitting orthogonal frequency division multiplexing (OFDM) networks with precoders have been proposed in this study. A 2×1 STFOFDM network will be first constructed using the STF paradigm. Secondly, to create a new 2×1 STFCC-OFDM network, a conjugate cancellation (CC) two way transmitting method is combined with the STF-OFDM network. Contrasting this approach to the CC method, it increases BER without increasing bandwidth or power. Finally, to create the 2×1 WHSTFCC-OFDM network, the Walsh-Hadamard (WH) transform has been used as the precoder. Moreover, a 2×2 WHSTFCC-OFDM structure is then developed. When more capacity is required, it can be utilized to boost BER or swap to dual 2×1 WHSTFCC-OFDM networks. According to calculations, the 2×1 WHSTFCC-OFDM network does have the lowest BER, followed by the STFCC-OFDM network and the STF-OFDM network. Corresponding to this, the 2×2 STFCC-OFDM system comes in second place behind the 2x1WHSTFCC-OFDM in terms of BER performance. Such WHSTFCC- and STFCC-OFDM methods have all been straightforward and outward-compatible with the current OFDM network. For the 4th generation and upcoming 5th generation MIMO networks, they might be used as core building components in OFDM transmitters and may dynamically transition between 2×2 and 2×1 designs as necessary.

Published on: October 12, 2023
doi: 10.17756/nwj.2023-s3-062
Citation: Savarimuthu SR, Daniel A, Alagarsamy M. 2023. A Design of Adaptive Space Time Frequency MIMO-OFDM with Nanotechnology. NanoWorld J 9(S3): S340-S349.

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