2 citations · 4 across the 11 of their papers we have counts for
11 papers
Bound on Peak-to-Average Power Ratio with Moment and Reduction Method
Hirofumi Tsuda
In this paper, we show bounds on Peak-to-Average Power Ratio (PAPR) and propose a method to reduce PAPR. These bounds are written in terms of moments of transmitted symbols. Furthe…
Moment-Based Bound on Peak-to-Average Power Ratio and Reduction with Unitary Matrix
Hirofumi Tsuda
Reducing Peak-to-Average Power Ratio (PAPR) is a significant task in OFDM systems. To evaluate the efficiency of PAPR-reducing methods, the complementary cumulative distribution fu…
Optimal Sequence and Performance for Desired User in Asynchronous CDMA System
Hirofumi Tsuda
We consider asynchronous CDMA systems in no-fading environments with a particular focus on a certain user. This certain user is called a desired user in this paper. In such a situa…
Randomization Approaches for Reducing PAPR with Partial Transmit Sequences and Semidefinite Relaxation
Hirofumi Tsuda, Ken Umeno
To reduce peak-to-average power ratio, we propose a method to choose a suitable vector for a partial transmit sequence technique. With a conventional method for this technique, we…
Method to Design UF-OFDM Filter and its Analysis
Hirofumi Tsuda, Ken Umeno
Orthogonal Frequency Division Multiplexing (OFDM) systems have been widely used as a communication system. In OFDM systems, there are two main problems. One of them is that OFDM si…
Non-Linear Programming: Maximize SNR for Designing Spreading Sequence - Part II: Conditions for Optimal Spreading Sequences
Hirofumi Tsuda, Ken Umeno
Signal to Noise Ratio (SNR) is an important index for wireless communications. In CDMA systems, spreading sequences are utilized. This series of papers show the method to derive sp…
Non-Linear Programming: Maximize SNR for Designing Spreading Sequence - Part I: SNR versus Mean-Square Correlation
Hirofumi Tsuda, Ken Umeno
Signal to Noise Ratio (SNR) is an important index for wireless communications. In CDMA systems, spreading sequences are utilized. This series of papers show the method to derive sp…
SNR Maximization as a Non-Linear Programming -Towards Optimal Spreading Sequence-
Hirofumi Tsuda, Ken Umeno
Signal to Noise Ratio (SNR) is an important index for wireless communications. There are many methods for increasing SNR. In CDMA systems, spreading sequences are used. We consider…
Numerical Approach to Maximize SNR for CDMA Systems
Hirofumi Tsuda, Ken Umeno
Signal to Noise Ratio (SNR) is an important index for wireless communications. There are many methods for increasing SNR. In CDMA systems, spreading sequences are used. To increase…
Orthogonal Basis Spreading Sequence for Optimal CDMA
Hirofumi Tsuda, Ken Umeno
Recently, new spreading sequences have been proposed to increase the capacity of users. In particular, the Weyl spreading sequences have the larger capacity of users than the Gold…
Weyl Spreading Sequence Optimizing CDMA
Hirofumi Tsuda, Ken Umeno
This paper shows an optimal spreading sequence in the Weyl sequence class, which is similar to the set of the Oppermann sequences for asynchronous CDMA systems. Sequences in Weyl s…