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.
Results
Showing 1 to 20 of 49 for “"Non-Coherent"”.
-
Differential modulation and non-coherent detection in wireless relay networks
… acquiring fading channels information for coherent detection is more challenging than in the traditional point-to-point communications. To bypass the requirement of channel information, differential modulation together with non-coherent detection can be deployed. This thesis is concerned …
-
The capacity of a non-coherent channel : multi user setting
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
-
A non-coherent ultra-wideband receiver : algorithms and digital implementation
… with signal bandwidths of 500 MHz or greater. A non-coherent receiver based on energy collection reduces complexity, cost, and power consumption at the cost of channel spectral efficiency. The receiver collects the signal energy in two time windows and determines the transmitted bits based on …
-
Coherent versus non-coherent space-time shift keying for co-located and distributed MIMO systems
… Multiple-Output (MIMO) systems using both coherent and non-coherent detection. Furthermore, we conceive new serially-concatenated turbo-coding assisted STSK arrangements for the sake of approaching the channel capacity limit, which are designed with the aid of EXtrinsic Information Transfer …
-
Modeling, simulation and implementation of a non-coherent binary-frequency-shift-keying (BFSK) receiver-transmitter into a field programmable gate array (FPGA)
… programmable gate array (FPGA) to implement a non-coherent binary-frequency-shift-keyed receiver-transmitter (BFSK-RT) that simulates the modulation of the SINCGARS radio, the RT-1523C. An FPGA successfully, and with very few resources, implemented the desired modulation and demodulation. …
-
A Model-Based Receiver for CPM Signals in a Cochannel Interference Limited Environment
… such as the limiter-discriminator permit the non-coherent demodulation of MSK signals. High-resolution frequency estimation appears as a very attractive alternative to the conventional non-coherent frequency detectors. The frequency estimation methods that we have studied are based on …
-
Cutting the datacenter tax in heterogeneous systems: a coherence-spectrum approach
… guiding design axis. Our approach advances from non-coherent to fully coherent designs. First, we introduce Styx, a SmartNIC-based framework that splits memory optimization features into a control plane and a data plane. By offloading repetitive, CPU-intensive data-plane functions via RDMA to a …
-
A study of the minimum shift keying modulation scheme
… The aspects considered are its operation under non-linear conditions as well as an investigation into the hardware implementation of both coherent and non-coherent MSK modems. The literature on digital data transmission and MSK in particular is surveyed, and a comprehensive theoretical …
-
Efficient Interference Cancellation Techniques for Advanced DS-CDMA Receivers
… DSP implementations are devised, one fully coherent and one non-coherent. Multi-symbol differential detection is then explored as an alternative for improving the performance of the non-coherent approach. Additionally, dual-antenna diversity techniques are also investigated as a means for …
-
Weak GPS Signal Acquisition Using Antenna Diversity
… is required. A common method is to extend the coherent integration time. However, in weak signal situations, using only long coherent integration is limited by navigation data bit transitions and receiver oscillator instability. Using non-coherent and differentially coherent integration …
-
An all-digital transmitter for pulsed ultra-wideband communication
… mode between pulses. Furthermore, the use of non-coherent UWB signaling greatly simplifies both transmitter and receiver implementations, offering additional energy savings. This thesis presents an all-digital transmitter designed for a non-coherent pulsed UWB system. By exploiting relaxed …
-
Ambient Backscatter Communication Systems: Design, Signal Detection and Bit Error Rate Analysis
… of ambient backscatter systems, including non-coherent detection and encoding schemes, and investigate techniques such as multiple antenna interference cancellation and frequency-shift backscatter to improve the bit error rate performance of the designed ambient backscatter systems. First, …
-
Performance analysis of Binary FSK signals with L-Fold diversity selection combining techniques in a Nakagami-M fading channel
… investigates the performance analysis of a non-coherent Binary Frequency Shift Keying (BFSK) receiver using Selection Combining techniques over a frequency non-selective, slowly fading Nakagami channel. These techniques are independent of the number of diversity branches, so simpler …
-
Channel estimation for Gigabit Multi-user MIMO-OFDM Systems
… the receiver is assumed not to know the channel (non-coherent detection), or alternatively, when the random channel is tracked at the receiver (coherent detection). It can be shown that for a given error probability, coherent detection schemes require a Signal to Noise Ratio (SNR) that is 3dB less …
-
Synchronization in Impulse Based Ultra Wideband Systems
… short pulse duration and very low duty cycle. Coherent detection of ultra wide-band signals requires complex channel estimation algorithms. In impulse based UWB systems, suboptimal receivers that require no channel estimation are proposed for low data rate applications using non coherent …
-
Physical Layer Design for a Spread Spectrum Wireless LAN
… keying/quadrature phase shift keying (BPSK/QPSK) non-coherent receiver to overcome the adverse indoor wireless environment. Moreover, a variable data rate transmission technique is used to dynamically configure the spread spectrum system according to channel performance. This physical layer …
-
Contributions to a Context-Aware High Sensitivity GNSS Software Receiver
… four signal integrators, namely bit aiding coherent integrator, bit extracting coherent integrator, magnitude non-coherent integrator and squaring non-coherent integrator are developed and tested in the high sensitivity GNSS software receiver GSNRx-hsTM to increase the processing gain. While …
-
Energy efficient multiple antenna communication
… coherence length and number of antennas for the non-coherent channel to have a "near coherent" performance in the wideband regime. We also propose a signaling scheme that is near-capacity achieving in this regime. We compute the decoding error probability and study its dependence on SNR, number …
-
Beamforming and scan pattern performance evaluation of rotating maritime multi-beam phased array surveillance radar
… (slow and low) targets with a low PRF waveform. Coherent and noncoherent (surface only) processing algorithms were used. Complex clutter data sets from the CSIR Fynmeet sea clutter measurement trial were adapted according to the Georgia Institute of Technology (GIT) model, clutter area model and …
-
Development of an algorithm for the detection of coherency in radar signal waveforms
… into which radar emissions can be subdivided are coherent and non-coherent RF. A great deal of confusion often surrounds the use of these terms, especially among those who measure radar emissions rather than those who build the radar sets. For the purposes of this paper, coherence will be defined …
Page 1 of 3