Improvement of Multipath Delay Resolution with Imaging Components on Separate Frequency Channel in Fractional Sampling OFDM

Yutaro NAKAGAWA; Mamiko INAMORI; Yukitoshi SANADA

doi:10.1587/transfun.E95.A.1971

Improvement of Multipath Delay Resolution with Imaging Components on Separate Frequency Channel in Fractional Sampling OFDM

Yutaro NAKAGAWA, Mamiko INAMORI, Yukitoshi SANADA

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In this paper, an imaging components transmission scheme for the improvement of multipath delay resolution in a Fractional Sampling (FS) OFDM receiver is proposed. FS has been proposed as a diversity scheme and achieves path diversity by enlarging the bandwidth of the baseband filters in order to transmit the imaging components of the desired signal. However, FS is not able to achieve diversity with very short delay multipaths because of its low multipath delay resolution. Wider bandwidth of the transmission signal is required to improve the resolution of the delay. On the other hand, cognitive radio is an emerging technology to utilize frequency spectrum flexibly through dynamic spectrum access (DSA). To resolve the small delay multipaths and to use the spectrum flexibly with DSA, this paper investigates the FS path diversity with the imaging components on the separated frequency channel. The correlation between the 2 FS branches is analyzed theoretically on the 2 path channel under the conditions of sampling interval, delay spread, and frequency separation. Numerical results through computer simulation show that the proposed scheme improves the multipath resolution and the bit error rate (BER) performance under the existence of small delay multipaths.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E95-A No.11 pp.1971-1979

Publication Date: 2012/11/01

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Online ISSN: 1745-1337

DOI: 10.1587/transfun.E95.A.1971

Type of Manuscript: Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)

Category: Communication Theory and Signals

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Yutaro NAKAGAWA, Mamiko INAMORI, Yukitoshi SANADA, "Improvement of Multipath Delay Resolution with Imaging Components on Separate Frequency Channel in Fractional Sampling OFDM" in IEICE TRANSACTIONS on Fundamentals, vol. E95-A, no. 11, pp. 1971-1979, November 2012, doi: 10.1587/transfun.E95.A.1971.
Abstract: In this paper, an imaging components transmission scheme for the improvement of multipath delay resolution in a Fractional Sampling (FS) OFDM receiver is proposed. FS has been proposed as a diversity scheme and achieves path diversity by enlarging the bandwidth of the baseband filters in order to transmit the imaging components of the desired signal. However, FS is not able to achieve diversity with very short delay multipaths because of its low multipath delay resolution. Wider bandwidth of the transmission signal is required to improve the resolution of the delay. On the other hand, cognitive radio is an emerging technology to utilize frequency spectrum flexibly through dynamic spectrum access (DSA). To resolve the small delay multipaths and to use the spectrum flexibly with DSA, this paper investigates the FS path diversity with the imaging components on the separated frequency channel. The correlation between the 2 FS branches is analyzed theoretically on the 2 path channel under the conditions of sampling interval, delay spread, and frequency separation. Numerical results through computer simulation show that the proposed scheme improves the multipath resolution and the bit error rate (BER) performance under the existence of small delay multipaths.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/transfun.E95.A.1971/_p

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@ARTICLE{e95-a_11_1971,
author={Yutaro NAKAGAWA, Mamiko INAMORI, Yukitoshi SANADA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Improvement of Multipath Delay Resolution with Imaging Components on Separate Frequency Channel in Fractional Sampling OFDM},
year={2012},
volume={E95-A},
number={11},
pages={1971-1979},
abstract={In this paper, an imaging components transmission scheme for the improvement of multipath delay resolution in a Fractional Sampling (FS) OFDM receiver is proposed. FS has been proposed as a diversity scheme and achieves path diversity by enlarging the bandwidth of the baseband filters in order to transmit the imaging components of the desired signal. However, FS is not able to achieve diversity with very short delay multipaths because of its low multipath delay resolution. Wider bandwidth of the transmission signal is required to improve the resolution of the delay. On the other hand, cognitive radio is an emerging technology to utilize frequency spectrum flexibly through dynamic spectrum access (DSA). To resolve the small delay multipaths and to use the spectrum flexibly with DSA, this paper investigates the FS path diversity with the imaging components on the separated frequency channel. The correlation between the 2 FS branches is analyzed theoretically on the 2 path channel under the conditions of sampling interval, delay spread, and frequency separation. Numerical results through computer simulation show that the proposed scheme improves the multipath resolution and the bit error rate (BER) performance under the existence of small delay multipaths.},
keywords={},
doi={10.1587/transfun.E95.A.1971},
ISSN={1745-1337},
month={November},}

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TY - JOUR
TI - Improvement of Multipath Delay Resolution with Imaging Components on Separate Frequency Channel in Fractional Sampling OFDM
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1971
EP - 1979
AU - Yutaro NAKAGAWA
AU - Mamiko INAMORI
AU - Yukitoshi SANADA
PY - 2012
DO - 10.1587/transfun.E95.A.1971
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E95-A
IS - 11
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - November 2012
AB - In this paper, an imaging components transmission scheme for the improvement of multipath delay resolution in a Fractional Sampling (FS) OFDM receiver is proposed. FS has been proposed as a diversity scheme and achieves path diversity by enlarging the bandwidth of the baseband filters in order to transmit the imaging components of the desired signal. However, FS is not able to achieve diversity with very short delay multipaths because of its low multipath delay resolution. Wider bandwidth of the transmission signal is required to improve the resolution of the delay. On the other hand, cognitive radio is an emerging technology to utilize frequency spectrum flexibly through dynamic spectrum access (DSA). To resolve the small delay multipaths and to use the spectrum flexibly with DSA, this paper investigates the FS path diversity with the imaging components on the separated frequency channel. The correlation between the 2 FS branches is analyzed theoretically on the 2 path channel under the conditions of sampling interval, delay spread, and frequency separation. Numerical results through computer simulation show that the proposed scheme improves the multipath resolution and the bit error rate (BER) performance under the existence of small delay multipaths.
ER -