Pub Date : 2014-05-27DOI: 10.1109/BlackSeaCom.2014.6849034
David Seebacher, C. Schuberth, P. Singerl, M. Gadringer, W. Bösch
To cope with the increasing demand for bandwidth in wireless communications coding schemes with high crest factors are employed. As a result the power amplifier (PA) is operated far below maximum output power for most of the time, leading to low average efficiency in traditional designs. Therefore PA concepts providing efficiency enhancement in back off are key for efficient transmitters. Baseband PWM operated PAs in combination with direct filter connection are possible candidates. Due to the constant current of the used filters special PA structures are required. The proposed source modulated amplifier offers these properties. Its general operational principle is presented and an implementation study in a GaN MMIC process was carried out. The designed PA operates at 2.65 GHz delivering a maximum output power of 3W. To get optimum performance of the direct filter connection a codesign of the PA and the cavity filter included in the output matching network was performed, resulting in a compact solution.
{"title":"A source modulated amplifier in GaN designed for baseband PWM and direct filter connection","authors":"David Seebacher, C. Schuberth, P. Singerl, M. Gadringer, W. Bösch","doi":"10.1109/BlackSeaCom.2014.6849034","DOIUrl":"https://doi.org/10.1109/BlackSeaCom.2014.6849034","url":null,"abstract":"To cope with the increasing demand for bandwidth in wireless communications coding schemes with high crest factors are employed. As a result the power amplifier (PA) is operated far below maximum output power for most of the time, leading to low average efficiency in traditional designs. Therefore PA concepts providing efficiency enhancement in back off are key for efficient transmitters. Baseband PWM operated PAs in combination with direct filter connection are possible candidates. Due to the constant current of the used filters special PA structures are required. The proposed source modulated amplifier offers these properties. Its general operational principle is presented and an implementation study in a GaN MMIC process was carried out. The designed PA operates at 2.65 GHz delivering a maximum output power of 3W. To get optimum performance of the direct filter connection a codesign of the PA and the cavity filter included in the output matching network was performed, resulting in a compact solution.","PeriodicalId":427901,"journal":{"name":"2014 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127339524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-01DOI: 10.1109/BlackSeaCom.2014.6848999
Burcu Tepekule, A. E. Pusane, Huseyin Birkan Yilmaz, T. Tuğcu
Molecular communication (MC) aims to develop a promising bio-inspired communication paradigm for nanotechnology, in which molecules are used to encode, transmit, and receive information. One of the main challenges in MC is the intersymbol interference (ISI) caused by the nature of the diffusion channel. The most popular solution to reduce the effects of ISI in MC is to keep the symbol duration as long as possible and reduce the number of molecules that can be received in subsequent symbol durations. On the other hand, a long symbol duration leads to a very low data rate, even for very short distances. Furthermore, due to the size of the nano-scale machines, production of energy becomes an essential problem. In this paper, an ISI mitigation technique for diffusion-based molecular communication channels, titled Molecular Transition Shift Keying (MTSK) is proposed in order to increase the data rate via suppressing the negative impact of the ISI on communication quality. MTSK employs multiple molecule types and the energy efficient extended version of MTSK with power adjustment (MTSK-PA) makes use of the residual molecules in the channel to reduce the ISI that would otherwise contribute to the ISI. It is shown via computer simulations that both MTSK and MTSK-PA outperforms the standard modulation techniques proposed in the literature.
{"title":"Energy efficient ISI mitigation for communication via diffusion","authors":"Burcu Tepekule, A. E. Pusane, Huseyin Birkan Yilmaz, T. Tuğcu","doi":"10.1109/BlackSeaCom.2014.6848999","DOIUrl":"https://doi.org/10.1109/BlackSeaCom.2014.6848999","url":null,"abstract":"Molecular communication (MC) aims to develop a promising bio-inspired communication paradigm for nanotechnology, in which molecules are used to encode, transmit, and receive information. One of the main challenges in MC is the intersymbol interference (ISI) caused by the nature of the diffusion channel. The most popular solution to reduce the effects of ISI in MC is to keep the symbol duration as long as possible and reduce the number of molecules that can be received in subsequent symbol durations. On the other hand, a long symbol duration leads to a very low data rate, even for very short distances. Furthermore, due to the size of the nano-scale machines, production of energy becomes an essential problem. In this paper, an ISI mitigation technique for diffusion-based molecular communication channels, titled Molecular Transition Shift Keying (MTSK) is proposed in order to increase the data rate via suppressing the negative impact of the ISI on communication quality. MTSK employs multiple molecule types and the energy efficient extended version of MTSK with power adjustment (MTSK-PA) makes use of the residual molecules in the channel to reduce the ISI that would otherwise contribute to the ISI. It is shown via computer simulations that both MTSK and MTSK-PA outperforms the standard modulation techniques proposed in the literature.","PeriodicalId":427901,"journal":{"name":"2014 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125353500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-01DOI: 10.1109/BlackSeaCom.2014.6849020
S. Bunin, Kostiantyn Plotnyk
One of the challenges in designing self-organizing networks is scalability of such networks. Increasing the number of subscribers on the network and territory of their location leads to significant increasing of packet delivery time from source to destination nodes. This is because usually packet relay in Ad Hoc and MANET networks is based on “store-and-forward” mechanism where each relay node buffers received packet, performs packet processing at three layers (physical, data link, network) of OSI model, performs a route lookup for this packet and then gets media access for packet transmission to the next hop. All this operations on each hop in the route constitute the total packet transmission delay, especially operation of getting media access.
{"title":"New approach in construction ad hoc and MANET radio networks with impulse ultrawideband radio signals","authors":"S. Bunin, Kostiantyn Plotnyk","doi":"10.1109/BlackSeaCom.2014.6849020","DOIUrl":"https://doi.org/10.1109/BlackSeaCom.2014.6849020","url":null,"abstract":"One of the challenges in designing self-organizing networks is scalability of such networks. Increasing the number of subscribers on the network and territory of their location leads to significant increasing of packet delivery time from source to destination nodes. This is because usually packet relay in Ad Hoc and MANET networks is based on “store-and-forward” mechanism where each relay node buffers received packet, performs packet processing at three layers (physical, data link, network) of OSI model, performs a route lookup for this packet and then gets media access for packet transmission to the next hop. All this operations on each hop in the route constitute the total packet transmission delay, especially operation of getting media access.","PeriodicalId":427901,"journal":{"name":"2014 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117077618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：