The search functionality is under construction.

The search functionality is under construction.

In this paper, a scheme for constructing the flat frequency spectrum of interleaved frequency division multiple access (IFDMA) is proposed. Since IFDMA is one of the single carrier modulation schemes, the frequency spectrum components are fluctuated and depend on the information data sequence. Even if IFDMA modulation scheme makes frequency spectrum dispersive for obtaining frequency diversity gain, frequency diversity gain is reduced by the fluctuation of frequency spectrum. In addition, in decision directed channel estimation (DDCE), which achieves good channel estimation accuracy in fast fading environment, the accuracy of channel transfer function estimated at the significant attenuated frequency component is much degraded. In the proposed technique, a random phase sequence is multiplied to the information data sequence for constructing the flat frequency spectrum. As a result, the frequency diversity gain is enlarged and the accuracy of channel estimation by DDCE is improved. Furthermore, we consider the blind estimation technique for the random phase sequence selected by transmitter. We show the effects of the proposed scheme by computer simulation.

- Publication
- IEICE TRANSACTIONS on Fundamentals Vol.E93-A No.12 pp.2672-2681

- Publication Date
- 2010/12/01

- Publicized

- Online ISSN
- 1745-1337

- DOI
- 10.1587/transfun.E93.A.2672

- Type of Manuscript
- Special Section PAPER (Special Section on Wideband Systems)

- Category

The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.

Copy

Takeo YAMASAKI, Osamu TAKYU, Koichi ADACHI, Yohtaro UMEDA, Masao NAKAGAWA, "Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication" in IEICE TRANSACTIONS on Fundamentals,
vol. E93-A, no. 12, pp. 2672-2681, December 2010, doi: 10.1587/transfun.E93.A.2672.

Abstract: In this paper, a scheme for constructing the flat frequency spectrum of interleaved frequency division multiple access (IFDMA) is proposed. Since IFDMA is one of the single carrier modulation schemes, the frequency spectrum components are fluctuated and depend on the information data sequence. Even if IFDMA modulation scheme makes frequency spectrum dispersive for obtaining frequency diversity gain, frequency diversity gain is reduced by the fluctuation of frequency spectrum. In addition, in decision directed channel estimation (DDCE), which achieves good channel estimation accuracy in fast fading environment, the accuracy of channel transfer function estimated at the significant attenuated frequency component is much degraded. In the proposed technique, a random phase sequence is multiplied to the information data sequence for constructing the flat frequency spectrum. As a result, the frequency diversity gain is enlarged and the accuracy of channel estimation by DDCE is improved. Furthermore, we consider the blind estimation technique for the random phase sequence selected by transmitter. We show the effects of the proposed scheme by computer simulation.

URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E93.A.2672/_p

Copy

@ARTICLE{e93-a_12_2672,

author={Takeo YAMASAKI, Osamu TAKYU, Koichi ADACHI, Yohtaro UMEDA, Masao NAKAGAWA, },

journal={IEICE TRANSACTIONS on Fundamentals},

title={Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication},

year={2010},

volume={E93-A},

number={12},

pages={2672-2681},

abstract={In this paper, a scheme for constructing the flat frequency spectrum of interleaved frequency division multiple access (IFDMA) is proposed. Since IFDMA is one of the single carrier modulation schemes, the frequency spectrum components are fluctuated and depend on the information data sequence. Even if IFDMA modulation scheme makes frequency spectrum dispersive for obtaining frequency diversity gain, frequency diversity gain is reduced by the fluctuation of frequency spectrum. In addition, in decision directed channel estimation (DDCE), which achieves good channel estimation accuracy in fast fading environment, the accuracy of channel transfer function estimated at the significant attenuated frequency component is much degraded. In the proposed technique, a random phase sequence is multiplied to the information data sequence for constructing the flat frequency spectrum. As a result, the frequency diversity gain is enlarged and the accuracy of channel estimation by DDCE is improved. Furthermore, we consider the blind estimation technique for the random phase sequence selected by transmitter. We show the effects of the proposed scheme by computer simulation.},

keywords={},

doi={10.1587/transfun.E93.A.2672},

ISSN={1745-1337},

month={December},}

Copy

TY - JOUR

TI - Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication

T2 - IEICE TRANSACTIONS on Fundamentals

SP - 2672

EP - 2681

AU - Takeo YAMASAKI

AU - Osamu TAKYU

AU - Koichi ADACHI

AU - Yohtaro UMEDA

AU - Masao NAKAGAWA

PY - 2010

DO - 10.1587/transfun.E93.A.2672

JO - IEICE TRANSACTIONS on Fundamentals

SN - 1745-1337

VL - E93-A

IS - 12

JA - IEICE TRANSACTIONS on Fundamentals

Y1 - December 2010

AB - In this paper, a scheme for constructing the flat frequency spectrum of interleaved frequency division multiple access (IFDMA) is proposed. Since IFDMA is one of the single carrier modulation schemes, the frequency spectrum components are fluctuated and depend on the information data sequence. Even if IFDMA modulation scheme makes frequency spectrum dispersive for obtaining frequency diversity gain, frequency diversity gain is reduced by the fluctuation of frequency spectrum. In addition, in decision directed channel estimation (DDCE), which achieves good channel estimation accuracy in fast fading environment, the accuracy of channel transfer function estimated at the significant attenuated frequency component is much degraded. In the proposed technique, a random phase sequence is multiplied to the information data sequence for constructing the flat frequency spectrum. As a result, the frequency diversity gain is enlarged and the accuracy of channel estimation by DDCE is improved. Furthermore, we consider the blind estimation technique for the random phase sequence selected by transmitter. We show the effects of the proposed scheme by computer simulation.

ER -