Intercell Interference Cancellation for MC-CDMA Systems

Doukopoulos, X.G.; Legouable, Rodolphe

doi:10.1109/vetecs.2007.336

Cited by 9 publications

(2 citation statements)

References 8 publications

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“…Interference cancellation methods for orthogonal frequency-division multiplex (OFDM) communication systems have been proposed previously. However, most of these works have been focused on frequency-domain intercarrier or inter-cell interference avoidance for data decoding [12,13]. Other methods, such as the forward-link hyperbolic geo-location method using pilot sub-carrier in the data symbol were proposed for OFDM communication systems [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Hearability Enhancement Method for Forward-Link Multilateration Using OFDM Signal

Park¹,

Lim²,

Lee³

et al. 2013

Journal of Electrical Engineering and Technology

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-Together with the GPS-based approach, geo-location through mobile communication networks is a key technology for location-based service. To save the cost, most geo-location system is implemented on the existed network service, which has a cellular structure. Still, multilateration is limited in cellular structure because it is difficult for the mobile terminal to acquire distance measurements from multiple base stations. This low hearability in the receiver is caused by co-channel interference and multipath environment. Therefore, hearability enhancement is necessary for multilateration under multipath and interference environment. Former time domain based hearability methods were designed for real signals. However, orthogonal frequency division multiplexing (OFDM) signal, which its usage has been increased in digital wireless communication, is a complex signal. Thus, different hearability enhancement method is needed for OFDM signals. This paper proposes a hearability enhancement method for forward-link multilateration using OFDM signals, which employ interference cancellation and multipath mitigation. A novel interference cancellation and multipath mitigation strategy for complex-valued OFDM signals is presented that has an iterative structure. Simulation results show that the proposed multilateration method provides the user's position with an accuracy of less than 80m through the mobile WiMAX cellular network in multipath environment.

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Section: Introductionmentioning

confidence: 99%

A Novel Hearability Enhancement Method for Forward-Link Multilateration Using OFDM Signal

Park¹,

Lim²,

Lee³

et al. 2013

Journal of Electrical Engineering and Technology

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“…WiBro 프리앰블의부반송파할당구조. Multiplexing) 통신 시스템에 대한 간섭 상쇄 기법들이 제안 되었지만 이들의 대부분은 데이터 디코딩을 목적으로 부반 송파(subcarrier) 간 간섭제거 혹은 이웃 셀 신호의 상쇄에 초점을 두어 지상파 측위용에 적합하지 않다 [9,10]. 또한 지 상파 측위를 목적으로 데이터 디코딩 정보를 이용하여 간 섭 상쇄를 수행하는 기법이 제안되기도 하였다 [11] 식에서 위 첨자 H는 Hermitian transpose를 의미하며, n V 은 잡음 l n 의 복소 공분산 행렬로서 다음과 같이 (2Np + 1)×(2Np + 1)의 차원을 갖는다 [13].…”

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Enhancement of Hearability in Geolocation Using Mobile WiMAX Network with Interference Cancellation and Long Integration

Park

Lim²,

Sung³

2012

Journal of Institute of Control, Robotics and Systems

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Abstract:Together with the GPS-based approach, geolocation through mobile communication networks is a key technology for location-based service. Since the Mobile WiMAX system is considered as a candidate for fourth-generation mobile systems, it is important to investigate its location capability. The geolocation of Mobile WiMAX can be realized when the preamble symbols in the down-link channel are appropriately used for a TDOA (Time-Difference-of-Arrival) approach. However, the cellular structure of Mobile WiMAX inevitably generates co-channel interference, and it is difficult for the mobile terminal to acquire distance measurements from multiple base stations. Therefore, for geolocation via multilateration using the Mobile WiMAX network, it is very important to increase hearability. This paper proposes a geolocation method for Mobile WiMAX which employs interference cancellation and preamble signal overlapping for the enhancement of hearability. A novel interference cancellation strategy for complex-valued Mobile WiMAX signals is presented which has an iterative structure. Simulation results show that the proposed geolocation method provides the user's position with an accuracy of less than 20 m through the Mobile WiMAX cellular network if there is no multi-path or NLOS (None-Line-of-Sight). Keywords: WiBro, geo-location, interference cancelation

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