Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) for Broadband Packet Wireless Access

Hiroyuki ATARASHI; Sadayuki ABETA; Mamoru SAWAHASHI

Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) for Broadband Packet Wireless Access

Hiroyuki ATARASHI, Sadayuki ABETA, Mamoru SAWAHASHI

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This paper proposes Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) as the most promising forward link wireless access method in broadband packet wireless transmission using an approximate 50 to 100 MHz bandwidth. The proposed OFCDM employing VSF can flexibly realize near optimum wireless access satisfying higher radio link capacity both in isolated cell environments such as hot-spot areas and indoor offices and in multi-cell environments such as cellular systems by adaptively changing the appropriate spreading factor, SF, in the frequency domain based on the cell structure, radio link conditions such as the delay spread, and major radio link parameters such as the data modulation scheme and channel coding rate. Furthermore, by establishing SF=1, i.e., no spreading mode, VSF-OFCDM can be used as orthogonal frequency division multiplexing (OFDM). Computer simulation results demonstrate that, while SF=1 (OFDM) achieves higher link capacity than SF>1 in an isolated-cell environment, OFCDM with the optimized SF value over 1 achieves approximately 1.4 times higher capacity compared with OFDM in a multi-cell environment associated with the advantageous one-cell frequency reuse. Consequently, VSF-OFCDM can provide seamless deployment of broadband packet wireless access with higher radio link capacity, that is, OFDM in an isolated-cell environment, and OFCDM with the adaptively optimized SF value over 1 in a multi-cell environment according to the major radio link conditions and radio link parameters, by only changing the spreading factor.

Publication: IEICE TRANSACTIONS on Communications Vol.E86-B No.1 pp.291-299

Publication Date: 2003/01/01

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Type of Manuscript: Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)

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Hiroyuki ATARASHI, Sadayuki ABETA, Mamoru SAWAHASHI, "Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) for Broadband Packet Wireless Access" in IEICE TRANSACTIONS on Communications, vol. E86-B, no. 1, pp. 291-299, January 2003, doi: .
Abstract: This paper proposes Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) as the most promising forward link wireless access method in broadband packet wireless transmission using an approximate 50 to 100 MHz bandwidth. The proposed OFCDM employing VSF can flexibly realize near optimum wireless access satisfying higher radio link capacity both in isolated cell environments such as hot-spot areas and indoor offices and in multi-cell environments such as cellular systems by adaptively changing the appropriate spreading factor, SF, in the frequency domain based on the cell structure, radio link conditions such as the delay spread, and major radio link parameters such as the data modulation scheme and channel coding rate. Furthermore, by establishing SF=1, i.e., no spreading mode, VSF-OFCDM can be used as orthogonal frequency division multiplexing (OFDM). Computer simulation results demonstrate that, while SF=1 (OFDM) achieves higher link capacity than SF>1 in an isolated-cell environment, OFCDM with the optimized SF value over 1 achieves approximately 1.4 times higher capacity compared with OFDM in a multi-cell environment associated with the advantageous one-cell frequency reuse. Consequently, VSF-OFCDM can provide seamless deployment of broadband packet wireless access with higher radio link capacity, that is, OFDM in an isolated-cell environment, and OFCDM with the adaptively optimized SF value over 1 in a multi-cell environment according to the major radio link conditions and radio link parameters, by only changing the spreading factor.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/e86-b_1_291/_p

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@ARTICLE{e86-b_1_291,
author={Hiroyuki ATARASHI, Sadayuki ABETA, Mamoru SAWAHASHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) for Broadband Packet Wireless Access},
year={2003},
volume={E86-B},
number={1},
pages={291-299},
abstract={This paper proposes Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) as the most promising forward link wireless access method in broadband packet wireless transmission using an approximate 50 to 100 MHz bandwidth. The proposed OFCDM employing VSF can flexibly realize near optimum wireless access satisfying higher radio link capacity both in isolated cell environments such as hot-spot areas and indoor offices and in multi-cell environments such as cellular systems by adaptively changing the appropriate spreading factor, SF, in the frequency domain based on the cell structure, radio link conditions such as the delay spread, and major radio link parameters such as the data modulation scheme and channel coding rate. Furthermore, by establishing SF=1, i.e., no spreading mode, VSF-OFCDM can be used as orthogonal frequency division multiplexing (OFDM). Computer simulation results demonstrate that, while SF=1 (OFDM) achieves higher link capacity than SF>1 in an isolated-cell environment, OFCDM with the optimized SF value over 1 achieves approximately 1.4 times higher capacity compared with OFDM in a multi-cell environment associated with the advantageous one-cell frequency reuse. Consequently, VSF-OFCDM can provide seamless deployment of broadband packet wireless access with higher radio link capacity, that is, OFDM in an isolated-cell environment, and OFCDM with the adaptively optimized SF value over 1 in a multi-cell environment according to the major radio link conditions and radio link parameters, by only changing the spreading factor.},
keywords={},
doi={},
ISSN={},
month={January},}

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TY - JOUR
TI - Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) for Broadband Packet Wireless Access
T2 - IEICE TRANSACTIONS on Communications
SP - 291
EP - 299
AU - Hiroyuki ATARASHI
AU - Sadayuki ABETA
AU - Mamoru SAWAHASHI
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E86-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2003
AB - This paper proposes Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) as the most promising forward link wireless access method in broadband packet wireless transmission using an approximate 50 to 100 MHz bandwidth. The proposed OFCDM employing VSF can flexibly realize near optimum wireless access satisfying higher radio link capacity both in isolated cell environments such as hot-spot areas and indoor offices and in multi-cell environments such as cellular systems by adaptively changing the appropriate spreading factor, SF, in the frequency domain based on the cell structure, radio link conditions such as the delay spread, and major radio link parameters such as the data modulation scheme and channel coding rate. Furthermore, by establishing SF=1, i.e., no spreading mode, VSF-OFCDM can be used as orthogonal frequency division multiplexing (OFDM). Computer simulation results demonstrate that, while SF=1 (OFDM) achieves higher link capacity than SF>1 in an isolated-cell environment, OFCDM with the optimized SF value over 1 achieves approximately 1.4 times higher capacity compared with OFDM in a multi-cell environment associated with the advantageous one-cell frequency reuse. Consequently, VSF-OFCDM can provide seamless deployment of broadband packet wireless access with higher radio link capacity, that is, OFDM in an isolated-cell environment, and OFCDM with the adaptively optimized SF value over 1 in a multi-cell environment according to the major radio link conditions and radio link parameters, by only changing the spreading factor.
ER -