The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
MC(Multi-carrier) 신호는 포락선 전력비를 의미하는 피크가 크므로 MC 신호는 전력 증폭기 스테이지의 비선형성으로 인해 높은 수준의 상호 변조 왜곡을 겪게 됩니다. 휴대용 단말기의 경우 높은 전력 효율이 필요하기 때문에 선형 증폭기를 사용하는 것은 바람직하지 않습니다. 이 문제를 해결하기 위해 우리는 순방향 링크와 역방향 링크 사이에 비대칭 변조 방식을 사용하는 TDD(Time Division Duplex)-CDMA(코드 분할 다중 접속) 통신 시스템을 제안합니다. 시스템은 순방향 링크를 위한 다중 캐리어 변조와 역방향 링크를 위한 단일 캐리어 변조로 구성됩니다. 본 논문에서는 순방향 링크 전송을 위한 사전 등화 방법도 제시합니다. 주파수 선택적 페이딩에서 시스템은 전위상 등화기를 사용하여 이동국에서 채널 추정 장치 없이 경로 다이버시티 효과를 달성합니다. 시뮬레이션 결과로부터 제안 시스템은 다른 사용자 간섭 신호를 억제하는 능력을 갖고 있기 때문에 제안 시스템이 기존 MC-CDMA 시스템과 모바일 장치에 장착된 단일 캐리어 RAKE 시스템보다 더 나은 BER 성능을 달성한다는 것을 확인했습니다.
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Incheol JEONG, Masao NAKAGAWA, "A Time Division Duplex CDMA System Using Asymmetric Modulation Scheme in Duplex Channel" in IEICE TRANSACTIONS on Communications,
vol. E82-B, no. 12, pp. 1956-1963, December 1999, doi: .
Abstract: Multi-carrier (MC) signal has a large peak to mean envelope power ratio, so that the MC signal suffers from a high level of inter-modulation distortion due to the nonlinearity of the power amplifier stage. For portable terminals, it is undesirable to use linear amplifiers because high power efficiency is needed. To solve this problem, we propose a time division duplex (TDD)-code division multiple access (CDMA) communication system which uses an asymmetric modulation scheme between the forward and reverse links. The system consists of multicarrier modulation for the forward link and single carrier modulation for the reverse link. A pre-equalization method for the forward link transmission is also presented in this paper. In frequency selective fading, the system achieves a path diversity effect without any channel estimation unit at the mobile station by using the pre-phase equalizer. From the simulation results, it it found that the proposed system achieves better BER performance than the conventional MC-CDMA system and the single carrier RAKE system equipped at the mobile unit since the proposed system has the ability to suppress other user interfering signals.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e82-b_12_1956/_p
부
@ARTICLE{e82-b_12_1956,
author={Incheol JEONG, Masao NAKAGAWA, },
journal={IEICE TRANSACTIONS on Communications},
title={A Time Division Duplex CDMA System Using Asymmetric Modulation Scheme in Duplex Channel},
year={1999},
volume={E82-B},
number={12},
pages={1956-1963},
abstract={Multi-carrier (MC) signal has a large peak to mean envelope power ratio, so that the MC signal suffers from a high level of inter-modulation distortion due to the nonlinearity of the power amplifier stage. For portable terminals, it is undesirable to use linear amplifiers because high power efficiency is needed. To solve this problem, we propose a time division duplex (TDD)-code division multiple access (CDMA) communication system which uses an asymmetric modulation scheme between the forward and reverse links. The system consists of multicarrier modulation for the forward link and single carrier modulation for the reverse link. A pre-equalization method for the forward link transmission is also presented in this paper. In frequency selective fading, the system achieves a path diversity effect without any channel estimation unit at the mobile station by using the pre-phase equalizer. From the simulation results, it it found that the proposed system achieves better BER performance than the conventional MC-CDMA system and the single carrier RAKE system equipped at the mobile unit since the proposed system has the ability to suppress other user interfering signals.},
keywords={},
doi={},
ISSN={},
month={December},}
부
TY - JOUR
TI - A Time Division Duplex CDMA System Using Asymmetric Modulation Scheme in Duplex Channel
T2 - IEICE TRANSACTIONS on Communications
SP - 1956
EP - 1963
AU - Incheol JEONG
AU - Masao NAKAGAWA
PY - 1999
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E82-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 1999
AB - Multi-carrier (MC) signal has a large peak to mean envelope power ratio, so that the MC signal suffers from a high level of inter-modulation distortion due to the nonlinearity of the power amplifier stage. For portable terminals, it is undesirable to use linear amplifiers because high power efficiency is needed. To solve this problem, we propose a time division duplex (TDD)-code division multiple access (CDMA) communication system which uses an asymmetric modulation scheme between the forward and reverse links. The system consists of multicarrier modulation for the forward link and single carrier modulation for the reverse link. A pre-equalization method for the forward link transmission is also presented in this paper. In frequency selective fading, the system achieves a path diversity effect without any channel estimation unit at the mobile station by using the pre-phase equalizer. From the simulation results, it it found that the proposed system achieves better BER performance than the conventional MC-CDMA system and the single carrier RAKE system equipped at the mobile unit since the proposed system has the ability to suppress other user interfering signals.
ER -