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Time Domain Equalizer and Its Signal Processing Method

A time-domain equalizer and signal technology, which is applied in digital transmission systems, baseband system components, baseband systems, etc., can solve problems such as overall system performance degradation and inter-symbol interference

Inactive Publication Date: 2020-10-30
MEDIATEK INC
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  • Claims
  • Application Information

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Problems solved by technology

However, in a more complex communication environment, there may still be a propagation delay exceeding the length of the guard interval, resulting in inter-symbol interference, which in turn leads to a decrease in the overall performance of the system

Method used

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  • Time Domain Equalizer and Its Signal Processing Method
  • Time Domain Equalizer and Its Signal Processing Method
  • Time Domain Equalizer and Its Signal Processing Method

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Embodiment Construction

[0045] The time-domain equalizer and signal processing method proposed by the present invention define a new cost function, and perform operations based on the least mean square algorithm, so as to find out the effective elimination of echo for each weighting circuit in the time-domain equalizer. The weight of the signal.

[0046] It first introduces the application of the concept of the present invention to Figure 1A and Figure 1B A temporal domain equalizer 100 is presented. As previously mentioned, the output signal z of the time domain equalizer 100 can be expressed as:

[0047]

[0048] The design goal of the time domain equalizer 100 of the present invention is to approximate the signal generating circuit 110 p Choose an appropriate amount of time delay D p,m and weight w p,m , such that the approximate signal s p Try to be the same as the p-th echo signal, so that the equalized signal z generated by the time-domain equalizer 100 according to Equation 3 is clos...

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Abstract

The invention provides a time domain equalizer, comprising a delay circuit, a weighting circuit, a controller and a totaling circuit. The delay circuit generates M delayed signals for an equalized signal. The weighting circuit applies an mth weight in M weights for an mth delayed signal in the M delayed signals, thereby generating an mth weighted signal. The totaling circuit totals the M weightedsignals for the time domain equalizer to update the equalized signals according to a result. The controller iterates and updates the M weights according to a vector as shown in the specification. A symbol e<n,p,j> is defined as shown in the specification, a symbol n is an iteration times index, k is a sample index, z[k] is an kth sample of the equalized signals, j is an integer index in a range of1 to M, and D<p,j> represents time delay quantity corresponding to an jth delayed signal in the M delayed signals.

Description

technical field [0001] The present invention is related to time-domain equalizers, and in particular to the way of determining weight coefficients in time-domain equalizers. Background technique [0002] Orthogonal frequency-division multiplexing (OFDM) technology has been widely used in communication systems in recent years due to its advantages of high spectrum utilization and simple hardware architecture. An OFDM signal is composed of multiple symbols. In order to avoid intersymbol interference (ISI) caused by echo signals in multiple propagation paths (multipath), a guard interval is provided at the front end of each symbol. However, in a more complex communication environment, there may still be a propagation delay exceeding the guard interval length, which may cause inter-symbol interference, thereby degrading the overall performance of the system. This problem cannot be solved by frequency domain equalization technology, but an additional time domain equalizer must ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
CPCH04L25/03057H04L25/03146H04L2025/03611
Inventor 周禹伸魏逢时赖科印
Owner MEDIATEK INC
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