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Time domain equalizer and signal processing method

A time-domain equalizer and signal technology, applied in the baseband system, shaping network in the transmitter/receiver, digital transmission system, etc., can solve the problems of overall system performance decline, inter-symbol interference, etc.

Inactive Publication Date: 2018-07-24
MEDIATEK INC
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  • Claims
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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 signal processing method

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Embodiment Construction

[0035] The time-domain equalizer and the signal processing method proposed by the present invention define a new cost function, and operate on the basis of the least mean square algorithm, so as to find an effective way to eliminate echoes for each weighting circuit in the time-domain equalizer weight of the signal.

[0036] First, the application of the concept of the present invention to Figure 1A and Figure 1B The time domain equalizer 100 is presented. As previously mentioned, the output signal z of the time domain equalizer 100 can be represented as:

[0037]

[0038] The design goal of the time domain equalizer 100 of the present invention is to generate the circuit 110 for an approximate signal p Choose an appropriate amount of time delay D p,m and weight w p,m , so 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 close to the original ...

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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 manner in which the weighting coefficients in the time domain equalizer are determined. 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. The OFDM signal is composed of multiple symbols. In order to avoid intersymbol interference (ISI) caused by echo signals (echosignals) in multiple propagation paths, each symbol front end is provided with a guard interval (guard interval). However, in a more complex communication environment, there may still be a propagation delay that exceeds the length of the guard interval, thereby causing inter-symbol interference and further reducing the overall performance of the system. This problem cannot be solved by frequency domain equalization technolo...

Claims

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Application Information

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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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