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This paper presents a hardware-efficient autocorrelation scheme for the synchronization of MIMO-OFDM based wireless local area network (WLAN) systems, such as IEEE 802.11n. Carrier frequency offset (CFO) estimation for the frequency synchronization requires high complexity autocorrelation operations of many training symbols. In order to reduce the hardware complexity of the MIMO-OFDM synchronization,...
An energy efficient cooperative MIMO technique is proposed in the wireless sensor networks where fixed constellation size is considered in transmitting both the local and long haul communication. A selection criteria is used here based on the channel conditions where a selected numbers of sensors in a cluster are used to form a multiple input multiple output (MIMO) structure wirelessly connected with...
Energy efficient data transfer is the key factor for the design of energy efficient wireless sensor network (WSN). IEEE 1451.5 standard explores the wireless communication schemes between multiple sensors and a data gathering node (DGN) emphasizing the multiple input single output (MISO) structure. Sensors participating in this MISO can be chosen selectively for more energy efficient data transfer...
Although conventional cryptographic security mechanisms are essential to the overall problem of security, the openness of wireless medium poses both threats and opportunities for securing transmission. Information theoretic security is attracting researchers for its robust nature. In this paper, a Gaussian multiple input multiple output multiple eavesdropper (MIMOME) channel is considered where a...
Breadth-first search sphere decoding (SD) is considered as one of the most promising methods for multiple-input multiple-output (MIMO) detection due to its low computational complexity, capability of providing fixed throughput and pipelining features. However, the performance of the conventional breadth-first search SD is significantly degraded if the number of candidate symbols kept at each level...
In this paper, we present a timing synchronization scheme of the next generation IEEE 802.tin wireless LAN standard which is based on MIMO-OFDM technique. The proposed timing synchronization method takes two steps which consist of two modified auto-correlators. For coarse timing synchronization, a sliding window differentiator is used after a conventional auto-correlation in order to avoid plateau...
An energy efficient cooperative technique is proposed for the IEEE 1451 based wireless sensor networks. Selected numbers of wireless transducer interface modules (WTIMs) are used to form a multiple input single output (MISO) structure wirelessly connected with a network capable application processor (NCAP). Energy efficiency and delay of the proposed architecture are derived for different combination...
A boundary value of the velocity of data gathering node (DGN) and a critical value for training overhead beyond which the scheme will not be feasible for a multiple input multiple output (MIMO) based cooperative communication for energy-limited wireless sensor networks is proposed in this paper. The performance in terms of energy efficiency and delay for a combination of two transmitting and two receiving...
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