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This paper proposes a hybrid state observer which combines a Luenberger observer and a sliding mode observer for speed-sensorless motor drives of induction machines. The stator current and rotor flux linkage is estimated following a Luenberger observer approach. The rotor speed is estimated using a sliding mode observer. The combination of two observers take advantage of both. Luenberger observer...
This paper proposes a bi-directional grid-tied converter with GPS capability for smart-grid applications. The novelty of this converter is that time-stamped grid voltage angle received via network communication channels has been used to synchronize the converter to the grid. Therefore, all grid-tied converters in a microgrid with this development will not require line voltage sensing and phase-locked...
In order to find out current operating channel of the hub during emergency in medical implant communication, an implant node sequentially sends an empty frame in all the available channels until it receives an acknowledgement. The channel scanning process by sending an empty frame in advance, however, adds higher overhead if the probability of transmission in the correct channel is high and/or payload...
During some cases, especially when the channel quality varies considerably between the receivers, MU-MIMO transmission may fail to utilize the available MIMO capacity to its full potential. A MAC protocol design that can switch between MU-MIMO and multiple SU-MIMO transmissions after taking into account the achievable performance could be one of the simple yet attractive solutions to address such...
An initiative approach towards uniform integration of Wireless Body Area Network (WBAN) with various outgoing networks can provide a landmark in Ubiquitous Health care (U-Health) development. More interestingly, provided with Self Organizing Network (SON) characteristics, integration of WBAN with femtocell deployed cellular networks, which can bridge WBAN with widely deployed broadband connections...
To realize the multi-user multiple input multiple output (MIMO) advantage over WLANs, it requires significant changes in the MAC protocol. Either the dominant MAC protocol carrier sense multiple access/collision avoidance (CSMA/CA) needs to be replaced by a novel multi-user MIMO aware MAC protocol or it should be upgraded into multi-user MIMO aware CSMA/CA. Nevertheless, the simplest approach would...
Compared to the traditional SISO system, one of the major benefits of MIMO is to increase spectral efficiency employing spatial multiplexing. However, such an independently increased PHY layer capacity cannot be translated easily to MAC layer capacity gain unless special measures are taken in MAC protocols. For distributed WLANs with MIMO, subtle modifications in dominant MAC protocol CSMA/CA can...
In this paper, an intrinsic but less studied problem that frequently happens during contention resolution in backoff based collision resolution process (termed as cross-collision in this paper) is comprehended and a simple but elegant solution is proposed to alleviate it. The solution is named as Cross Collision Exclusion (XCE). The notion behind the XCE is to first foresee the set of contention slots...
Compared to the traditional SISO system, one of the major benefits of MIMO is to increase spectral efficiency using spatial multiplexing. Hence, most of the existing wireless networks are getting highly attracted towards MIMO implementation in order to meet their ever increasing higher capacity demand. However, independently increased physical layer capacity can not be translated to MAC layer capacity...
For uplink time synchronization and power adjustment, ranging process has been suggested for OFDMA (orthogonal frequency division multiple access) based BWA (broadband wireless access) networks like IEEE 802.16. The CDMA (code division multiple access) type code transmission in contention based ranging channel has been provisioned to send the ranging request by an SS (subscriber station) to BS (base...
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