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
본 논문에서는 시간 다중화된 파일럿 기호 지원 채널 추정을 적용하고 효율적인 다단계 변조, 하이브리드 자동 통합을 통해 응집성 시분할-직교 주파수 및 코드 분할 다중화(TD-OFCDM)를 사용하여 순방향 링크에서 고속 광대역 패킷 무선 액세스를 평가합니다. 반복 요청(ARQ) 및 50~100MHz 대역폭을 통한 코드 다중화. 컴퓨터 시뮬레이션 결과는 먼저 데이터 심볼의 전송 전력보다 6dB 더 높은 전송 전력을 갖는 공통 시간 다중 파일럿 심볼이 패킷의 시작과 끝 모두에 배치되어야 하며, 채널 추정의 최적 평균 간격이 주파수 영역은 채널의 지연 확산에 따라 다릅니다. 패킷 전송을 위해 최적화된 이러한 매개변수를 기반으로, 주파수 영역에서 EGC(등가득 결합)를 사용한 확산 신호의 축적과 심각한 주파수 선택적(다중경로) 페이딩으로 인해 코드 다중화된 채널 간의 직교성이 파괴된다는 것을 보여줍니다. 이는 특히 다중 레벨 변조 및 높은 코딩 속도를 사용할 때 달성 가능한 처리량 성능을 저하시킵니다. 결과적으로, 8PSK 데이터 변조 및 속도 컨벌루션 코딩을 갖춘 일관된 TD-OFCDM R = 2개 코드 다중화를 사용하는 3/XNUMX(확산 인자(SF)은 16) 평균 수신에서 약 105Mbps의 최고 처리량을 달성합니다. Eb/N0 24경로 레일리 페이딩 채널(rms 지연 확산, σ= 3μsec)에서 약 0.1dB(비트 대 잡음 전력 스펙트럼 밀도 비율당 신호 에너지)입니다. 또한 QPSK와 일관된 TD-OFCDM에서 R = 4/5 또는 8PSK 및 R = 1/2, 80Mbps 이상의 처리량 성능은 평균 수신에서 달성됩니다. Eb/N0 20경로 레일리 페이딩 채널(σ= 24 µsec)에서도 약 0.2dB입니다.
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.
부
Hiroyuki ATARASHI, Sadayuki ABETA, Mamoru SAWAHASHI, "Performance Evaluation of Coherent High-Speed TD-OFCDM Broadband Packet Wireless Access in Forward Link Employing Multi-Level Modulation and Hybrid ARQ" in IEICE TRANSACTIONS on Fundamentals,
vol. E84-A, no. 7, pp. 1670-1680, July 2001, doi: .
Abstract: This paper evaluates high-speed broadband packet wireless access in the forward link using coherent Time Division-Orthogonal Frequency and Code Division Multiplexing (TD-OFCDM) by applying time-multiplexed pilot symbol assisted channel estimation and integrating efficient multi-level modulation, hybrid automatic repeat request (ARQ), and code-multiplexing over a 50-100 MHz bandwidth. Computer simulation results first clarify that the common time-multiplexed pilot symbols with the transmit power of 6 dB higher than that of data symbols should be placed at both the beginning and end of a packet, and that the optimum averaging interval of channel estimates in the frequency domain is different according to the delay spread of a channel. Based on these optimized parameters for packet transmission, we show that the orthogonality among the code-multiplexed channels is destroyed due to severe frequency selective (multipath) fading and the accumulation of spread signals using equal gain combining (EGC) in the frequency domain. This degrades the achievable throughput performance especially when employing multi-level modulation and a high coding rate. Consequently, coherent TD-OFCDM with 8PSK data modulation and the convolutional coding of rate R = 2/3 employing sixteen-code multiplexing (spreading factor (SF) is 16) achieves the highest throughput of approximately 105 Mbps at the average received Eb/N0 (signal energy per bit-to-noise power spectrum density ratio) of approximately 24 dB in a 3-path Rayleigh fading channel (rms delay spread, σ= 0.1 µsec). Furthermore, in coherent TD-OFCDM with QPSK and R = 4/5 or 8PSK and R = 1/2, throughput performance greater than 80 Mbps is achieved at the average received Eb/N0 of approximately 20 dB even in a 24-path Rayleigh fading channel (σ= 0.2 µsec).
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e84-a_7_1670/_p
부
@ARTICLE{e84-a_7_1670,
author={Hiroyuki ATARASHI, Sadayuki ABETA, Mamoru SAWAHASHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Performance Evaluation of Coherent High-Speed TD-OFCDM Broadband Packet Wireless Access in Forward Link Employing Multi-Level Modulation and Hybrid ARQ},
year={2001},
volume={E84-A},
number={7},
pages={1670-1680},
abstract={This paper evaluates high-speed broadband packet wireless access in the forward link using coherent Time Division-Orthogonal Frequency and Code Division Multiplexing (TD-OFCDM) by applying time-multiplexed pilot symbol assisted channel estimation and integrating efficient multi-level modulation, hybrid automatic repeat request (ARQ), and code-multiplexing over a 50-100 MHz bandwidth. Computer simulation results first clarify that the common time-multiplexed pilot symbols with the transmit power of 6 dB higher than that of data symbols should be placed at both the beginning and end of a packet, and that the optimum averaging interval of channel estimates in the frequency domain is different according to the delay spread of a channel. Based on these optimized parameters for packet transmission, we show that the orthogonality among the code-multiplexed channels is destroyed due to severe frequency selective (multipath) fading and the accumulation of spread signals using equal gain combining (EGC) in the frequency domain. This degrades the achievable throughput performance especially when employing multi-level modulation and a high coding rate. Consequently, coherent TD-OFCDM with 8PSK data modulation and the convolutional coding of rate R = 2/3 employing sixteen-code multiplexing (spreading factor (SF) is 16) achieves the highest throughput of approximately 105 Mbps at the average received Eb/N0 (signal energy per bit-to-noise power spectrum density ratio) of approximately 24 dB in a 3-path Rayleigh fading channel (rms delay spread, σ= 0.1 µsec). Furthermore, in coherent TD-OFCDM with QPSK and R = 4/5 or 8PSK and R = 1/2, throughput performance greater than 80 Mbps is achieved at the average received Eb/N0 of approximately 20 dB even in a 24-path Rayleigh fading channel (σ= 0.2 µsec).},
keywords={},
doi={},
ISSN={},
month={July},}
부
TY - JOUR
TI - Performance Evaluation of Coherent High-Speed TD-OFCDM Broadband Packet Wireless Access in Forward Link Employing Multi-Level Modulation and Hybrid ARQ
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1670
EP - 1680
AU - Hiroyuki ATARASHI
AU - Sadayuki ABETA
AU - Mamoru SAWAHASHI
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E84-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 2001
AB - This paper evaluates high-speed broadband packet wireless access in the forward link using coherent Time Division-Orthogonal Frequency and Code Division Multiplexing (TD-OFCDM) by applying time-multiplexed pilot symbol assisted channel estimation and integrating efficient multi-level modulation, hybrid automatic repeat request (ARQ), and code-multiplexing over a 50-100 MHz bandwidth. Computer simulation results first clarify that the common time-multiplexed pilot symbols with the transmit power of 6 dB higher than that of data symbols should be placed at both the beginning and end of a packet, and that the optimum averaging interval of channel estimates in the frequency domain is different according to the delay spread of a channel. Based on these optimized parameters for packet transmission, we show that the orthogonality among the code-multiplexed channels is destroyed due to severe frequency selective (multipath) fading and the accumulation of spread signals using equal gain combining (EGC) in the frequency domain. This degrades the achievable throughput performance especially when employing multi-level modulation and a high coding rate. Consequently, coherent TD-OFCDM with 8PSK data modulation and the convolutional coding of rate R = 2/3 employing sixteen-code multiplexing (spreading factor (SF) is 16) achieves the highest throughput of approximately 105 Mbps at the average received Eb/N0 (signal energy per bit-to-noise power spectrum density ratio) of approximately 24 dB in a 3-path Rayleigh fading channel (rms delay spread, σ= 0.1 µsec). Furthermore, in coherent TD-OFCDM with QPSK and R = 4/5 or 8PSK and R = 1/2, throughput performance greater than 80 Mbps is achieved at the average received Eb/N0 of approximately 20 dB even in a 24-path Rayleigh fading channel (σ= 0.2 µsec).
ER -