Description: Channel estimation in using BEM model-especially in the doubly selective channel estimation Platform: |
Size: 2048 |
Author:Denver |
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Description: 同时具有时间选择性和频率选择性衰落的无线通信信道，我们称之为双选择性衰落信道[1-4]。研究在双选择性衰落信道下，实现最优的收发机设计，使其尽可能减小时频双选衰落，尤其是时间选择性衰落对系统性能的影响，提高系统对多普勒扩展和时延扩展的鲁棒性，对实现高速移动下的高速率、高质量的宽带传输具有十分重要的意义。-We consider the estimation of doubly selective wireless channels within pulseshaping
multicarrier systems (which include OFDM systems as a special case). A pilotassisted
channel estimation technique using the methodology of compressed sensing (CS) is
proposed. Platform: |
Size: 1153024 |
Author:徐微 |
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Description: 近十几年来，发展了一些相关的通信技术以最大的利用双选择性衰落信道的时间选择性和频率选择性.本文提出了一种新的基于训练序列的信道估计方法。-Coherent data communication over doubly-selective
channels requires that the channel response be known at the
receiver. Training-based schemes, which involve probing of the
channel with known signaling waveforms and processing of the
corresponding channel output to estimate the channel parameters,
are commonly employed to learn the channel response in
practice. Platform: |
Size: 158720 |
Author:徐微 |
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Description: Vehicular channel is characterized by non- stationarity and doubly selective nature. The term doubly selective implies that they have both time varying and frequency selective behaviour. The material attached here address this features. Platform: |
Size: 5497856 |
Author:John |
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Description: the Compressed Sensing (CS) methods in general and analyze the performance of Compressive Channel Estimation (CCE). CCE is an application of the theory and methodology of CS to the problem of estimating doubly selective channels in multicarrier systems. Based on the basic theories, a simulation tool will be built by using the MATLAB software package Platform: |
Size: 218112 |
Author:chuxuanbach |
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Description: we present a new space–time block code for timeand frequency-selective (doubly-selective) channels. It can be interpreted
as the extension of the Alamouti code to doubly-selective channels, and relies on a joint time–frequency reversal of the transmitted sequences. Under
certain channel conditions, the proposed space–time block code belongs
to the class that achieves full spatial, delay, and Doppler diversity using a
maximum-likelihood (ML) receiver, as well as a linear zero-forcing (LZF)
or linear minimum mean-squared error (LMMSE) receiver. For realistic
doubly-selective channels, a real-valued linear data model is presented, for
which different receiver structures can be developed. Platform: |
Size: 1024 |
Author:phuong |
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Description: ns STBC for purely time-selective channels by transforming the
time-selective channels into frequency-selective channels, and by
adjusting existing space–time code designs over frequency-selective
MIMO channels to collect joint space–Doppler gains over purely
time-selective MIMO channels. Further, [14] uses the ideas of [12] to
develop a space–time code that can achieve full space-delay-Doppler
diversity for any number of transmit–receive antennas. However, to
quantify the maximum Doppler diversity order [2], the above papers
rely on a parsimonious critically sampled complex-exponential basis
expansion model (CCE-BEM) for the underlying purely time-selective
or doubly-selective channels [16]. However, the CCE-BEM may have
a large modeling error under certain channel conditions Platform: |
Size: 1024 |
Author:phuong |
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Description: In this paper, we develop a novel STBC for multi-antenna transmissions over doubly-selective channels. The proposed STBC is designed
for a multiple-input single-output (MISO) system with two transmit
antennas and one receive antenna, i.e., a 2 1 system, but the ideas
can be extended to a general multiple-input multiple-output (MIMO)
system. The proposed technique can be interpreted as the extension
of the Alamouti code to doubly-selective channels, and relies on a
joint time–frequency reversal of the transmitted sequences. Platform: |
Size: 1024 |
Author:phuong |
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Description: Orthogonal STBC [4], [5] has been designed to achieve the spatial diversity offered by multiple transmit and/or receive antennas. The STBC
schemes proposed in [4] and [5] are designed for flat-fading channels,
which lead to a performance degradation in time- and frequency-selective channels. Our goal is to design efficient STBC schemes to counteract the effects of doubly-selective channels. The basic idea of the
proposed STBC for a 21 system is to multiplex the data sequence
in two data subsequences and to generate two orthogonal full-diversity
subchannels over doubly-selective channels. Then, we apply a scheme
that is similar to the Alamouti code. Platform: |
Size: 1024 |
Author:phuong |
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Description: Both these questions can be answered by assuming a restrictive yet
simple doubly-selective channel model. More specifically, we assume
ablock fading CCE-BEMchannel, which is defined as a block fading
channel where the time-variation subblock to subblock is modeled by a CCE-BEM. Hence, we first develop and analyze the STBC
under this block fading CCE-BEM channel model, and then, we show
how to decode the STBC for real-life channels, which do not exactly
fit this block fading CCE-BEM channel model-Both these questions can be answered by assuming a restrictive yet
simple doubly-selective channel model. More specifically, we assume
ablock fading CCE-BEMchannel, which is defined as a block fading
channel where the time-variation subblock to subblock is modeled by a CCE-BEM. Hence, we first develop and analyze the STBC
under this block fading CCE-BEM channel model, and then, we show
how to decode the STBC for real-life channels, which do not exactly
fit this block fading CCE-BEM channel model Platform: |
Size: 1024 |
Author:phuong |
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Description: a compressive estimator of doubly selective channels
within pulse-shaping multicarrier MIMO systems (including MIMOOFDM
as a special case). Platform: |
Size: 599040 |
Author:liying |
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Description: We propose a compressive method for tracking doubly selective
channels within multicarrier systems, including OFDMsystems. Using
the recently introduced concept of modified compressed sensing
(MOD-CS), the sequential delay-Doppler sparsity of the channel is
exploited to improve estimation performance through a recursive estimation
mode. The proposed compressive channel tracking algorithm
uses a MOD-CS version of OMP with reduced complexity.
Simulation results demonstrate substantial performance gains over
conventional compressive channel estimation Platform: |
Size: 309248 |
Author:liying |
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Description: 高移动性的宽带无线通信会受到时频双选择性衰落的严重影响。信道估计的质量对于整个系统的性能具有重要的影响，尤其是当信道经历快速的衰落时。因此，高质量的双选信道估计是高速无线通信的必然要求。 -Broadband wireless communication will be affected by the high mobility of time-frequency doubly selective fading. The quality of channel estimation has an important influence on the performance of the whole system, especially when the channel is experiencing fast fading. Therefore, the high quality of the doubly selective channel estimation is a necessary requirement for high speed wireless communication. Platform: |
Size: 10240 |
Author:yuanshijie |
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Description: Performance of a Linear-Detector Joint Radar-Communication System in Doubly-Selective Channels Platform: |
Size: 3144704 |
Author:besho |
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Description: 个人收集的一些有关双选信道信道估计的文章，对做双选信道的来说很有用处(Some of the doubly selective channel channel estimation in the personal collection, very useful for the doubly selective channel) Platform: |
Size: 5097472 |
Author:冯兴乐
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Search - doubly selective