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 48 for “"equalizers"”.
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Equalizers for communications satellites
… in development at MIT Lincoln Laboratory. Equalizers facilitate high data rate communication by correcting dispersion in the transmitter and receiver signal chains. An automated calibration procedure for finding optimal equalizers was developed. Repeated testing addressed questions about …
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Channel shortening equalizers for UWB receiver design simplification
Ultra Wideband (UWB) communication systems occupy large bandwidths with very low power spectral densities. This feature makes UWB channels highly rich in multipaths. To exploit the temporal diversity, a UWB receiver usually incorporates Rake reception. Each multipath in the channel carries just a …
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Generalized Data-Aided Equalizers for Digital Communication Channels
Although, the ACE structure has advantages in implementations of pipelined structure and canceller structure, we found that the performance of the ACE depends on the channel characteristics. Comparing the ACE with the DFE, the performance of the ACE is not always better than the performance of the …
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Design of optimal equalizers and precoders for MIMO channels
… worst-case approach to optimal design of channel equalizers leads to an equivalent optimal H-infinity filtering problem for the MIMO communication systems. An explicit design algorithm is derived which not only achieves the zero-forcing (ZF) condition, but also minimizes the RMS error between the …
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Adaptive polarization mode dispersion equalizers for coherent optical communications systems
… for the PMD, we use adaptive linear PMD equalizers. Due to the dynamic and random nature of PMD, it is crucial for a system designer to efficiently simulate the PMD-induced outage probabilities of 10-5. Because of this stringent requirement, it is computationally costly to use the …
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Non-Wiener Effects in Narrowband Interference Mitigation Using Adaptive Transversal Equalizers
… the LMS and normalized LMS adaptive transversal equalizers. The first contribution is the analysis of the mean of the LMS weights in steady state, assuming a large interference-to-signal ratio (ISR). The analysis is based on the Butterweck expansion of the weight update equation. The equalization …
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Non-Wiener Characteristics of LMS Adaptive Equalizers: A Bit Error Rate Perspective
Adaptive Least Mean Square (LMS) equalizers are widely used in digital communication systems primarily for their ease of implementation and lack of dependence on a priori knowledge of input signal statistics. LMS equalizers exhibit non-Wiener characteristics in the presence of a strong narrowband …
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Algorithms and Architectures for Joint Equalization and Decoding
… VLSI architecture is proposed, where SISO equalizers and decoders are running concurrently, thereby increasing throughput by up to 75%. To improve the BER further, a class of switching linear turbo equalizers is also shown along with several feasible switching schemes.
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Sparse equalizer filter design for multi-path channels
… thesis, sparse Finite Impulse Response (FIR) equalizers are designed for sparse multi-path channels under a pre-defined Mean Squared Error (MSE) constraint. We start by examining the intrinsic sparsity of the Zero Forcing equalizers and the FIR Minimum MSE (MMSE) equalizers. Next the …
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BER Modeling for Interference Canceling Adaptive NLMS Equalizer
Adaptive LMS equalizers are widely used in digital communication systems for their simplicity in implementation. Conventional adaptive filtering theory suggests the upper bound of the performance of such equalizer is determined by the performance of a Wiener filter of the same structure. However, …
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Equalization in continuous and discrete time for high speed links using 65 nm technology
… (CMOS), especially on designing both Tx and Rx equalizers. The equalizer is a key component in insuring communication as signals that propagate through some channel will have to endure insertion loss and cross talk, where this can cause two major problems: larger rise/fall times and lower signal …
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Intercarrier Interference Suppression for the OFDM Systems in Time-Varying Multipath Fading Channels
… motivates us to design the low-complexity Q-tap equalizers, namely, Minimum Mean Square Error (MMSE) linear equalizer and Decision Feedback (DF) non-linear equalizer to mitigate the ICI. Simulation results show that both Q-tap equalizers can improve the system performance in the sense of symbol …
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Characterization and Evaluation of Non-Line-of-Sight Paths for Fixed Broadband Wireless Communications
… (Z-F) and Minimum Mean Square Error (MMSE) equalizers employed on these channels had a significant impact on the link quality. In many cases, the performance of the MMSE equalizer performed only slightly better than the Z-F equalizer. However, when deep nulls were present in the channel …
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Model predictive control equalization for high-speed IO links
… developed to cope with these problems. These equalizers compensate the loss of transmission mediums, equalize for reflections and extend the channel's maximum data rate. In this work, we formulate a new, nonlinear and time-variant, transmitter equalization method based on the Model Predictive …
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Receiver equalization for a 10 gigabit per second high-speed serial link in 65 nm CMOS technology
… 3.1 link in 65 nm CMOS technology. Two types of equalizers are implemented: a continuous time linear equalizer (CTLE) and a 1-tap full-rate decision feedback equalizer (DFE). The combined CTLE and DFE architecture is simulated with an rms receiver clock jitter of 5.3 ps and achieves a BER < …
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Adaptive Equalization for Indoor Channels
… Adaptive arrays and their similarities to linear equalizers are also studied in this thesis. The properties and performance of simple adaptive array systems using the LMS and RLS algorithms are examined through simulation. This thesis concludes with an in-depth study of the use of adaptive …
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Digital equalization techniques for the compensation of nonlinear impairments in long-haul coherent optical communication systems
… Multiple-Input Multiple-Output (MIMO) nonlinear equalizers can further extend link capacity. Digital nonlinear equalization techniques fall into two categories: a) Pre-compensation techniques at the optical transmitter that render the signal propagation more resilient to fiber nonlinearities and …
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Jointly optimal pre- and post-channel equalization and distributed beamforming in asynchronous bi-directional relay networks
… weight vectors as well as pre- and post-channel equalizers at the two transceivers. We prove that our proposed approach results in a certain relay selection scheme.
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Equalization Techniques For Multipath Mitigation in Aeronautical Telemetry
… trade-offs between the two types of equalizers are discussed.</p>
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Low complexity turbo equalizations and lower bounds on information rate for intersymbol interference channels.
… (SISE) consisting of a few relatively weak equalizers is shown to provide robust performance in severe ISI channels. Constituent suboptimal equalizers are allowed to exchange soft information based on the method that are designed to suppress significant correlation among their soft outputs. …
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