On channel estimation for OFDM systems in multipath environments with relatively large delay spread

Lee, Wookwon

doi:10.1109/vetecs.2003.1207838

Cited by 3 publications

(4 citation statements)

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“…Another type of channel estimation is through comb-type pilot (pilot subcarriers over several OFDM symbols) which could require channel equalization if the channel is fast fading. Simple, yet practical, channel estimation technique is based on the least squares (LS) criteria [10]. The optimum estimation based on the maximum likelihood is known to achieve the best performance however; it is practically prohibited due to its large computational complexity.…”

Section: Channel Estimationmentioning

confidence: 99%

“…For a given linear system model in the matrix formulation of n x.H y (7) The LS (least squares) estimator described in [10] finds the channel impulse response LS ĥ , which minimizes the squared error:…”

Section: Channel Estimationmentioning

confidence: 99%

“…The estimated channel impulse response can be obtained as: (10) VI. SIMULATIONS In order to obtain simulation results, we have used a COFDM (Coded OFDM) system simulated with a 2 MHz bandwidth.…”

Section: Channel Estimationmentioning

confidence: 99%

“…Section 3 and 5 analyse respectively the general conception of concatenated code composed with Reed Solomon code and convolutional code [3,8] and the LS and ML channel estimation techniques [10,11,12,13]. Section 4 presents the chosen channel model.…”

Section: Introductionmentioning

confidence: 99%

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Channel estimation of OFDM system for high data rate communications on mobile environments

Ouarzazi

Berbineau²,

Dayoub³

et al. 2009

2009 9th International Conference on Intelligent Transport Systems Telecommunications, (ITST)

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One of the main challenges of the 4th Generationwireless systems is to provide high data rates in mobile environments. In these 4G products, WiMax (worldwide interoperability for microwave access) and LTE (Long Term Evolution) will be the platform technologies. The rapid development of the Internet with new services and applications has created new challenges for the development of mobile communications systems. Many wireless systems offer high data rate services (IEEE 802.11n, IEEE 802.15.3 and IEEE 802.16) [1, 4 and 5]. Possible migration of 3G to 4G (LTE) will increase data rates throughput in the range of 100Mbps. These high data rate applications may be difficult to support with the required quality-of-services (QoS) in high mobility environment. For example, the mobile WiMax can be used at mobile speeds of 60 km/h to 120 km/h sufficient for car applications but not for high speed trains. One possible solution is to use a main router for each coach connected with a single antenna to the external broadband network and to distribute the signal inside the coaches thanks to a repeater. An other architecture consider direct transmission to mobile cellular telephone networks using the 3G technology such as the HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access) allow high-speed data rates, opening the door to a range of mobile usage. All these future and advanced systems are mainly based on orthogonal frequency division multiplexing (OFDM) known to be resistant to various impairments in the mobile channels. In this paper, a transmission system based on OFDM technique and a solution for channel estimation is proposed. The main results will be presented in the case of high mobility context. Index Terms-DopplerEffect, Channel estimation, OFDM, Rayleigh Channel.

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Section: Channel Estimationmentioning

confidence: 99%

Section: Channel Estimationmentioning

confidence: 99%

Section: Channel Estimationmentioning

confidence: 99%