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Prakash Chaki - IEEE Xplore Author Profile
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Prakash Chaki

Publications
14
Citations
61
Publications by Year
20152024
Co-Authors:
Show All Co-Authors (14)
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Prakash Chaki

Affiliation

Advanced Network Research Laboratories, NEC Corporation, Japan

Publication Topics

Biography

Prakash Chaki received his master's degree in electrical engineering from the Indian Institute of Technology (IIT) Bombay, India, and the Ph.D. degree in information and communication engineering from The University of Tokyo, Japan. Since 2013, he has been with the R&D division of NEC Corporation, Japan where he is currently a Senior Researcher at the Advanced Network Research Laboratories working in Beyond 5G (B5G) and 6G wireless communications. Dr. Chaki was a recipient of the NEC Young Researcher Award 2019, the NEC Patent Award for contribution in terms of large number of issued patents in 2021, the IEICE Young Researcher Award 2016, and a two-time recipient of the NEC Excellence in Invention Award in 2015 and 2018. He was certified fo...
Publications
14
Citations
61
Publications by Year
20152024
Co-Authors:
Show All Co-Authors (14)
Author's Published Works

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Exploiting Sparse Matrix Solution to Mitigate Channel Aging in Sub-6 GHz 5G MU-MIMO Using Beamspace-Delay-Doppler Domain

Prakash Chaki;Jun Shikida;Kazushi Muraoka

2024 IEEE International Conference on Communications Workshops (ICC Workshops)
Year: 2024 | Conference Paper |
This paper proposes a novel uplink (UL) channel prediction technique to combat the effects of channel aging in multiuser multiple-input multiple-output (MU-MIMO) systems by exploiting the sparsity of channel matrix in three-stage-transformed domain, more specifically in the beamspace-delay-Doppler domain. Channel aging is a typical problem that impairs wireless systems due to inaccurate beamformin...Show More

Exploiting Sparse Matrix Solution to Mitigate Channel Aging in Sub-6 GHz 5G MU-MIMO Using Beamspace-Delay-Doppler Domain

Prakash Chaki;Jun Shikida;Kazushi Muraoka

Year: 2024 | Conference Paper |

Capacity and Outage Probability Analysis of Faster-Than-Nyquist Cooperative NOMA

Prakash Chaki;Shinya Sugiura

IEEE Wireless Communications Letters
Year: 2023 | Volume: 12, Issue: 9 | Journal Article |
Cited by: Papers (4)
This letter proposes a novel cooperative non-orthogonal multiple access (C-NOMA) based on precoded faster-than-Nyquist (FTN) signaling. The additional gain in degrees of freedom obtained from precoded FTN signaling is exploited in the context of relaying-induced diversity inherent to C-NOMA. We derive the achievable ergodic rate of the proposed scheme while also deriving a closed-form expression o...Show More

Capacity and Outage Probability Analysis of Faster-Than-Nyquist Cooperative NOMA

Prakash Chaki;Shinya Sugiura

Year: 2023 | Volume: 12, Issue: 9 | Journal Article |

Precoded Filterbank Multicarrier Index Modulation With Non-Orthogonal Subcarrier Spacing

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

IEEE Transactions on Communications
Year: 2023 | Volume: 71, Issue: 2 | Journal Article |
Cited by: Papers (1)
In this paper, we propose a novel precoded non-orthogonal frequency division multiplexing (NOFDM) with subcarrier index modulation (SIM) to increase spectral efficiency for multicarrier systems. The proposed NOFDM-SIM scheme is constituted by a filterbank multicarrier system under reduced subcarrier spacing, where precoded index modulated symbols are mapped onto the subcarriers. The detrimental ef...Show More

Precoded Filterbank Multicarrier Index Modulation With Non-Orthogonal Subcarrier Spacing

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

Year: 2023 | Volume: 71, Issue: 2 | Journal Article |

Power-Domain-Multiplexed Precoded Faster-Than-Nyquist Signaling for NOMA Downlink

Prakash Chaki;Shinya Sugiura

GLOBECOM 2022 - 2022 IEEE Global Communications Conference
Year: 2022 | Conference Paper |
Cited by: Papers (3)
In this paper, we propose a novel precoded faster-than-Nyquist (FTN) signaling scheme with power-domain-multiplexing in non-orthogonal multiple access (NOMA) down-link for tapping the joint benefits of high spectral efficiency and simultaneous multiuser connectivity. Non-orthogonality is introduced in both the symbol-interval (time) domain as well as in the multiple-access (power) domain to achiev...Show More

Power-Domain-Multiplexed Precoded Faster-Than-Nyquist Signaling for NOMA Downlink

Prakash Chaki;Shinya Sugiura

Year: 2022 | Conference Paper |

Precoded Non-Orthogonal Frequency Division Multiplexing with Subcarrier Index Modulation

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring)
Year: 2022 | Conference Paper |
Cited by: Papers (2)
In this paper, we propose a novel precoded non-orthogonal frequency division multiplexing (NOFDM) with sub-carrier index modulation (SIM) to increase spectral efficiency for multicarrier systems. The proposed NOFDM-SIM scheme is constituted by a filterbank multicarrier system under reduced subcarrier spacing, where precoded index modulated symbols are mapped onto the subcarriers. The detrimental e...Show More

Precoded Non-Orthogonal Frequency Division Multiplexing with Subcarrier Index Modulation

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

Year: 2022 | Conference Paper |

Eigendecomposition-Precoded Faster-Than-Nyquist Signaling With Index Modulation

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

IEEE Transactions on Communications
Year: 2022 | Volume: 70, Issue: 7 | Journal Article |
Cited by: Papers (5)
In this paper, we propose a precoded faster-than-Nyquist (FTN) signaling technique for time-domain single-carrier index-modulated symbol transmission. More precisely, eigenvalue decomposition (EVD) precoding is adopted for the FTN transmission of data bits modulated by single-carrier time-domain index modulation (IM). While the FTN scheme increases the spectral efficiency and data rate by increasi...Show More

Eigendecomposition-Precoded Faster-Than-Nyquist Signaling With Index Modulation

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

Year: 2022 | Volume: 70, Issue: 7 | Journal Article |

Eigenvalue Decomposition Precoded Faster-Than-Nyquist Transmission of Index Modulated Symbols

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

2021 IEEE International Symposium on Information Theory (ISIT)
Year: 2021 | Conference Paper |
Cited by: Papers (5)
In this paper, we propose a precoded faster-than-Nyquist (FTN) signaling technique for time-domain single-carrier index modulated (IM) symbol transmission. More precisely, eigenvalue decomposition precoding is adopted for the FTN transmission of data bits modulated by single-carrier time-domain IM. While the FTN scheme increases the spectral efficiency and data rate by packing more transmit symbol...Show More

Eigenvalue Decomposition Precoded Faster-Than-Nyquist Transmission of Index Modulated Symbols

Prakash Chaki;Takumi Ishihara;Shinya Sugiura

Year: 2021 | Conference Paper |

A Novel Design of CRC-Concatenated Polar Codes

Prakash Chaki;Norifumi Kamiya

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)
Year: 2019 | Conference Paper |
Cited by: Papers (10)
Typical construction of CRC concatenated polar codes append the CRC bits at the end of information bits and then feeds the resulting vector as input to the polar encoder. This construction comes with a caveat that CRC check cannot be performed till all information bits are decoded by the polar decoder. Hence it becomes impossible to do an early termination (ET) of successive cancellation decoder i...Show More

A Novel Design of CRC-Concatenated Polar Codes

Prakash Chaki;Norifumi Kamiya

Year: 2019 | Conference Paper |

Exploiting Group Structure in MAC Protocol Design for Multichannel Ad Hoc Cognitive Radio Networks

Sachin Kadam;Devika Prabhu;Nitish Rathi;Prakash Chaki;Gaurav S. Kasbekar

IEEE Transactions on Vehicular Technology
Year: 2019 | Volume: 68, Issue: 1 | Journal Article |
Cited by: Papers (9)
The design of an efficient medium access control (MAC) protocol for multichannel ad hoc cognitive radio networks is an important problem and has been the topic of extensive recent research. In this paper, we present the design and performance evaluation of a protocol, group MAC (GMAC), which is customized for a situation that commonly arises in ad hoc networks: The network consists of multiple gro...Show More

Exploiting Group Structure in MAC Protocol Design for Multichannel Ad Hoc Cognitive Radio Networks

Sachin Kadam;Devika Prabhu;Nitish Rathi;Prakash Chaki;Gaurav S. Kasbekar

Year: 2019 | Volume: 68, Issue: 1 | Journal Article |

On the Properties of Bit-Reversal Shortening in Polar Codes

Prakash Chaki;Norifumi Kamiya

2018 International Symposium on Information Theory and Its Applications (ISITA)
Year: 2018 | Conference Paper |
Cited by: Papers (5)
Puncturing and shortening are widely used methods employed to design arbitrary rate codes from a mother code of given rate. In the context of polar codes, the encoding process has to be completely redone based on the codelength and coding rate for any given shortening/puncturing pattern which makes the implementation of a rate-compatible polar code system very complex. This happens as reliability ...Show More

On the Properties of Bit-Reversal Shortening in Polar Codes

Prakash Chaki;Norifumi Kamiya

Year: 2018 | Conference Paper |

Strategic Mobility and Cooperative Caching in DTN: A Social Dilemma Perspective

Prakash Chaki;Takafumi Kanazawa;Kazunori Miyoshi

2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)
Year: 2016 | Conference Paper |
Content sharing in Delay Tolerant Networks is largely contingent on the cooperation of participating nodes as message dissemination is executed in a store-carry-forward approach. The scope of the term cooperation has largely been limited to content forwarding in prior work. This work considers a universe of distributed content- sources that generate disjoint contents. A population of users who are...Show More

Strategic Mobility and Cooperative Caching in DTN: A Social Dilemma Perspective

Prakash Chaki;Takafumi Kanazawa;Kazunori Miyoshi

Year: 2016 | Conference Paper |

Exploiting group structure in MAC protocol design for multichannel ad hoc Cognitive Radio Networks

Sachin Kadam;Devika Prabhu;Nitish Rathi;Prakash Chaki;Gaurav S. Kasbekar

2016 IEEE Wireless Communications and Networking Conference
Year: 2016 | Conference Paper |
Cited by: Papers (1)
The design of an efficient Medium Access Control (MAC) protocol for multichannel ad hoc Cognitive Radio Networks is an important problem and has been the topic of extensive recent research. In this paper, we present the design and performance evaluation of a protocol, Group MAC (GMAC), which is customized for a situation that commonly arises in ad hoc networks: the network consists of multiple gro...Show More

Exploiting group structure in MAC protocol design for multichannel ad hoc Cognitive Radio Networks

Sachin Kadam;Devika Prabhu;Nitish Rathi;Prakash Chaki;Gaurav S. Kasbekar

Year: 2016 | Conference Paper |

A Wi-Fi P2P communication platform between wireless LAN memory cards: Prototype implementation and performance evaluation

Masato Yasuda;Prakash Chaki;Gen Motoyoshi

2016 13th IEEE Annual Consumer Communications & Networking Conference (CCNC)
Year: 2016 | Conference Paper |
Wi-Fi Peer to Peer (P2P), commercially known as Wi-Fi Direct, is a recent industry standard that allows user devices to communicate with each other without requiring a Wi-Fi access point or Internet connectivity. Offering promising solutions for secure and high-throughput device to device communication over moderately high range, Wi-Fi P2P can potentially revolutionize M2M communication and Intern...Show More

A Wi-Fi P2P communication platform between wireless LAN memory cards: Prototype implementation and performance evaluation

Masato Yasuda;Prakash Chaki;Gen Motoyoshi

Year: 2016 | Conference Paper |

Seamless Group Reformation in WiFi Peer to Peer network using dormant backend links

Prakash Chaki;Masato Yasuda;Norihito Fujita

2015 12th Annual IEEE Consumer Communications and Networking Conference (CCNC)
Year: 2015 | Conference Paper |
WiFi Peer to Peer (P2P) aka WiFi Direct enables devices to communicate with each other in a peer to peer manner without requiring any Access Point at typical WiFi speed with WPA2 security. With its huge prospect in revolutionizing device to device communication, WiFi P2P can potentially play a much larger role amid the growing interest in M2M communication and Internet of Things. However, unlike a...Show More

Seamless Group Reformation in WiFi Peer to Peer network using dormant backend links

Prakash Chaki;Masato Yasuda;Norihito Fujita

Year: 2015 | Conference Paper |

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