Time domain adaptive decision feedback equalizer with double overlay structures
A technology of decision feedback equalization and overlapping structure, which is applied in the direction of equalizer, shaping network in transmitter/receiver, baseband system components, etc. Eliminate problems such as strong derived multipath, achieve the effect of eliminating strong multipath and derived multipath, and improving performance
Inactive Publication Date: 2013-08-21
SHANGHAI JIAOTONG UNIV
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However, the equalizer cannot eliminate the strong derivative multipath falling outside the FFF when the first root path is not the main path, and still regards it as a noise item, so the performance is not very ideal when dealing with harsh multipath effects
[0006] To sum up, the existing time-domain adaptive DFE either cannot deal with the strong multipath situation, or the performance of dealing with the strong multipath situation is not ideal enough
Therefore, judging from the currently available information, the existing time-domain adaptive DFE cannot deal with harsh multipath effects well.
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[0024] like figure 1 As shown, this embodiment includes: a feedforward overlapping filter 1, a feedback overlapping filter 2, a signal adder 5, a hard decision device 7, a decision signal memory 8, an error signal generator 6 and a tap coefficient updater 9, wherein: The output of the feed-forward overlap filter 1 is connected with an input of the signal adder 5, the output of the feedback overlap filter 2 is connected with the other input of the signal adder 5, and the output of the signal adder 5 is connected with the output of the hard decision device 7. The input is connected, the output of the hard decision device 7 is connected with the input of the second finite impulse response filter 10 in the feedback overlapping filter 2 and the input of the decision signal memory 8 is connected respectively, and the output of the decision signal memory 8 is connected with the feedback The input of the first finite impulse response filter 11 in the overlapping filter 2 is connected,...
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The invention relates to a time domain adaptive decision feedback equalizer with double overlay structures in the technical field of wireless communication. The time domain adaptive decision feedback equalizer comprises a feedforward overlapping filter, a feedback overlapping filter, a signal superimposer, a hard decider, a decision signal memory, an error signal generator and a tap coefficient updater. The time domain adaptive decision feedback equalizer has the functions of removing high multiple paths and deriving multiple paths.
Description
technical field [0001] The invention relates to a device in the technical field of wireless communication, in particular to a time-domain adaptive decision feedback equalizer with a double-overlapping structure. Background technique [0002] In a wireless communication system, due to the influence of the environment, the transmitted signal often reaches the receiving system through different paths, that is, there is multipath fading. The characteristics of the transmission system determine that it is impossible to satisfy the ideal waveform transmission without distortion conditions. Intersymbol interference (ISI) is inevitable. In order to improve communication quality and reduce ISI, equalization techniques are usually used at the receiving end to offset the influence of the channel. , making the received signal as close to distortion-free as possible. Due to the problem of multipath extension in the linear equalizer, it needs a long series and the output signal-to-noise ...
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IPC IPC(8): H04L25/03H04L27/01
Inventor 刘华芬刘勃熊箭归琳李素月
Owner SHANGHAI JIAOTONG UNIV