Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Back-Off"”.
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Getting rivals to back off? Biasing sales forecasts to reduce competition
I examine the effect of strategic competition on management sales forecast bias. Strategic complement firms react to a rival’s action by moving in the same direction (e.g., increasing their own sales in response to a rival’s sales increase). Strategic substitute firms react to a rival’s action by …
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Delay analysis of satellite packet broadcasting systems: a queueing theoretic approach
… cases. In the first case packet transmission and back off times are deterministic. In the second case packet transmission and back off times are exponentially distributed. The input parameters to this model are packet arrival rate, average packet transmission time, average back off time and …
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Opportunistic Random Media Access in WLANs
… standards access channel with binary exponential back-off algorithm and all nodes choose the back-off interval from the same initial range. The new protocol in this thesis divides nodes as well as contention windows in proportion to data rate. It offers three methods to group nodes and contention …
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
… in the package. Assisted by an integrated feedback path, a two-dimensional, digital look-up table (2-D LUT) adapted by complex gradient-descent algorithms compensates the I/Q mismatch and memoryless nonlinearities of the whole transmit path, including the severe amplitude and phase distortions …
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Efficiency Enhancement of Base Station Power Amplifiers Using Doherty Technique
… in such applications are forced to operate at a backed off region from saturation. Therefore, in order to overcome the battery lifetime limitation, a design of a high efficiency power amplifier that can maintain the efficiency for a wider range of radio frequency input signal is the obvious …
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Class-E Power Amplifiers in Modern RF Transmitters
… derives the parameters for both the peak and back-off power levels providing high efficiency. The proposed model demonstrates, that class-E PA with shunt capacitance and shunt filter is capable of providing high drain efficiency for back-off output power levels. The second contribution is a …
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Investigation and Design of New, Efficient and Compact Load Modulation Amplifiers for 5G Base Stations. Design, Simulation, Implementation and Measurements of Radio Frequency Power Amplifiers Using Active Load Modulation Technique for More Compact and Efficient 5G Base Stations Amplifiers
… In this case, the power amplifier should be backed off and designed to provide good linearity and efficiency over high PAPR. Among the efficiency enhancement techniques, the Doherty technique (Load modulation technique) is the simplest one, where no additional circuity nor signal processing …
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Congestion Control Protocols for the Evolving Internet
… for TCP users, then 4CP users completely back off and do not receive any throughput. The configuration and properties of 4CP, and the benefit to normal users from 4CP are studied through theoretical analysis, ns-2 simulations, and Internet experiments."
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Biomedical name recognition: A machine learning approach
… are integrated via a Hidden Markov Model with back-off modeling. Finally, we propose a method for biomedical abbreviation recognition and two methods for cascaded name recognition. Evaluation on GENIA corpus V3.02 and V1.1 shows our system achieves 66.5 and 62.5 F-measure respectively. It shows …
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Linearity Enhancement of High Power GaN HEMT Amplifier Circuits
… GaN power amplifiers have to be operated at back-off input power levels. Operating at back-off reduces the efficiency of the power amplifier along-with the output power. This research presents a technique to linearize GaN amplifiers. The linearity can be improved by splitting a large device …
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Spontaneous speech recognition using HMMs
… of context-dependent phonemes (triphones), (3) a back-off bigram statistical language model, and (4) a beam search decoder based on the Viterbi algorithm. The contextdependent acoustic models resulted in 67.9% phoneme recognition accuracy on the standard TIMIT speech database. Spontaneous speech …
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The Design of Linearized Power Amplifier for Wireless Communications
… The simplest technique that has been used is backing off the PA. However, this leads to very inefficient performance. A lot of more complex techniques were suggested in the literatures to trick the tradeoff between linearity and efficiency. So we discuss the advantages and disadvantages of …
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Trade-off between power consumption and delay in wireless packetized systems
… not need to incur delays such as those due to back-off schemes in traditional ALOHA systems. However, there is a trade-off between delay and power consumption. Recent work in this area has considered the case where multiple users are aware of the states of other users' queues. We consider a …
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Efficient baseband design and implementation for high-throughput transmitters
… (parallelism and pipelining) and aggressive back-end power optimization techniques (noncritical path Vt re- placement and sizing reductions), we achieve a record energy-efficiency and through- put for asymmetric-multilevel-outphasing (AMO) signal component separator (SCS) of 32pJ/sample at …
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Timing channel codes for covert communication and network flow tracing
… covert communication in a computer network. It offers the means to communicate a message by relaying information encrypted within the timings formed between consecutive packets. This thesis covers two schemes that utilize the timing channel for covert communication -- to send a message and to …
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A hardware testbed for measuring IEEE 802.11g DCF performance
… frame headers, randomised binary exponential back-off and inter-frame spaces. Having accurate and verified performance models for DCF is thus integral to understanding the performance of IEEE 802.11 as a whole. In this document DCF performance is measured subject to two different workload …
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Efficient distributed medium access algorithm
… utilized in practice, it is a "randomized" or "back-off-like" algorithm and uses "carrier sense" information. This is the first instance of MAC that is proven to be performance optimal for general interference topology. Our solution blends the classical Metropolis-Hastings sampling mechanism …
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Gallium nitride class-F power amplifier for UMTSWCDMA applications
… and -28.5 dBc and -43 dBc respectively at 6 dB back-off from peak power.
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Assuring network service with bandwidth and integrity based fairness
… users send few packets and occasionally back-off and fail while competing for resources. The Internet architecture provides only modest support for verifying the true origin of a packet or intention of a sender. This makes identification and filtering of attack traffic difficult. DDoS …
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A Linear RF Power Amplifier with High Efficiency for Wireless Handsets
… high linearity with enhanced efficiency at back-off power levels, and covers a broadband frequency response. The amplifier is thus able to operate in multiple modes (2G/2.5G/3G/4G). The design techniques provide contributions to current research in handset power amplifiers, especially to the …
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