Design and implementation of synchronization and AGC for OFDM-based WLAN receivers

Jiménez, Víctor P. Gil; García, M. Julia Fernández‐Getino; Serrano, Francisco J. González; Armada, Ana García

doi:10.1109/tce.2004.1362493

Cited by 58 publications

(25 citation statements)

References 10 publications

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“…Since a receiver performs AGC using the received STF, one might wonder if it affects AGC. Since it is difficult to find the exact starting sample of STF when it is detected, the exact pattern of STF is not utilized in AGC [13,8]. Instead existing AGC algorithms control the hardware gain parameter using the running average of the received STF magnitude.…”

Section: Antenna Gain Control (Agc)mentioning

confidence: 99%

Fine-grained spectrum adaptation in WiFi networks

Yun

Kim

Qiu

2013

Proceedings of the 19th Annual International Conference on Mobile Computing &Amp; Networking - MobiCom '13

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-Explosive growth of WiFi traffic calls for new technologies to dramatically improve spectrum efficiency. In this paper, we propose an approach to adapt the spectrum on a per-frame basis. It consists of three major components: (i) a fine-grained spectrum access design that allows a sender and receiver to change their transmission and reception spectrum on demand, (ii) fast and accurate spectrum detection that allows a receiver to determine which spectrum is used by its sender on a per-frame basis by exploiting the IEEE 802.11 preamble structure, and (iii) an efficient spectrum allocation algorithm that determines which spectrum to use for each transmission by taking into account frequency diversity and interference. It can further be adapted to perform a joint assignment of spectrum, schedule, and access point (AP) for each frame. Using a SORA implementation and trace-driven simulation, we demonstrate the feasibility of per-frame spectrum adaptation and its significant benefit over existing channel assignment approaches. To our knowledge, this is the first per-frame spectrum adaptation prototype for WiFi networks.

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Section: Antenna Gain Control (Agc)mentioning

confidence: 99%

Fine-grained spectrum adaptation in WiFi networks

Yun

Kim

Qiu

2013

Proceedings of the 19th Annual International Conference on Mobile Computing &Amp; Networking - MobiCom '13

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“…However it is observed from [14] that in an operation scenario it may not be possible for the AGC to settle down before the end of ten short OFDM symbol. So, we propose a correlation based timing offset estimation scheme using samples of one long OFDM symbol of the preamble.…”

Section: Timing Synchronization In Ieee 80211a Wlansmentioning

confidence: 99%

“…1). Timing synchronization schemes that are more specific to IEEE 802.11a WLANs have been reported in [10][11][12][13][14]. In [10], timing synchronization is achieved by correlating received signal with known training sequence of short OFDM symbol.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the timing synchronization scheme in [12] is good but the scheme is highly complex. Timing synchronization based on the correlation of received samples and samples of short OFDM symbol is also discussed in [13] and [14]. One of the interesting observations of the study in [14] is that, in an operational scenario, the settling time of Automatic Gain Control (AGC) may be large.…”

Section: Introductionmentioning

confidence: 99%

“…Timing synchronization based on the correlation of received samples and samples of short OFDM symbol is also discussed in [13] and [14]. One of the interesting observations of the study in [14] is that, in an operational scenario, the settling time of Automatic Gain Control (AGC) may be large. This phenomenon, in turn may make the use of short OFDM symbols ineffective for robust timing synchronization.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Timing Synchronization Metric for OFDM Based WLAN Systems

Sahu

Chakrabarti

Maskara

2009

Wireless Pers Commun

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System synchronization and channel estimation analysis for IEEE 802.16e OFDMA downlink system

Zhang

Cheng

Zhou

et al. 2008

Int J Communication

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SUMMARYSystem synchronization and channel estimation are two key problems of IEEE 802.16e Orthogonal Frequency Division Multiplex Access (OFDMA) downlink system. According to the standard, system synchronization is completed through the cell search procedure, which includes two steps: frame detection and cell-ID identification. First, based on the special time-domain (TD) and frequency-domain (FD) structures of the preamble, we propose two novel frame detection ms: the TD algorithm and the FD algorithm. Their robustness performance is nearly the same, and the complexity of the FD algorithm is only 1 31 of that of the TD algorithm. Then, an efficient cell-ID identification algorithm is proposed, in which the necessary correlation length can be dramatically shortened even without any a priori channel knowledge. Thereby, it greatly reduces the cell search time. As for the problem of channel estimation, a cluster-based channel estimation method is proposed. It is based on the special pilot distribution of IEEE 802.16e and utilizes the continuity of channel variations to mitigate the impact of time-variant channel. System simulation results show that the proposed algorithms are both robust and efficient.

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Design and implementation of synchronization and AGC for OFDM-based WLAN receivers

Abstract: Abstract

Cited by 58 publications

References 10 publications

Fine-grained spectrum adaptation in WiFi networks

Fine-grained spectrum adaptation in WiFi networks

A New Timing Synchronization Metric for OFDM Based WLAN Systems

System synchronization and channel estimation analysis for IEEE 802.16e OFDMA downlink system

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