Time domain equalizer and its control method
A technology of time domain equalizer and control method, which is applied in the directions of digital transmission system, baseband system components, baseband system, etc., can solve the problems of inter-symbol interference and overall system performance decline.
Active Publication Date: 2020-10-13
MEDIATEK INC
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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, resulting in a decrease in the overall performance of the system
This problem cannot be solved by frequency domain equalization technology, but an additional time domain equalizer must be set before the frequency domain equalizer at the receiving end
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[0019] In the signal model adopted in the present invention, the original signal sent by the transmitting end is represented as symbol x, and the received signal received by the receiving end is represented as symbol y. Without considering the symbol timing offset (symbol timing offset) and frequency offset (frequency offset), after passing through multiple propagation paths, the received signal y can be expressed as follows:
[0020]
[0021] Where k represents a sampling index, and P represents the total number of echo signals caused by multiple propagation paths of the transmission channel between the transmitting end and the receiving end. It can be seen from Equation 1 that the received signal y is the sum of the original signal x and P echo signals. symbol a p , θ p,k , (M p +Δ p ) respectively represent the amplitude magnification, phase offset and arrival time delay of the p-th echo signal among the P echo signals relative to the original signal x (P is a positi...
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The invention provides a time domain equalizer, and the equalizer is used for eliminating an echo signal in a receiving signal. The receiving signal comprises an original signal and the echo signal. The time domain equalizer includes a time delay amount estimator, an amplitude magnification estimator, and a phase offset estimator. The time delay amount estimator finds out a delay amount which canachieve the maximization of a cost function, wherein the delay amount serves as an estimated delay amount of the echo signal relative to the original signal. The amplitude magnification estimator determines an estimated amplitude magnifying power of the echo signal relative to the original signal according to the estimated delay amount. The phase offset estimator determines an estimated phase offset of the echo signal relative to the original signal according to the estimated delay amount.
Description
technical field [0001] The present invention relates to time-domain equalizers, and in particular to the way parameters are determined 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 multiple propagation paths (multipath), a guard interval (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 and reduce the overall performance of the system. This problem cannot be solved by frequency domain equalization technology, but an additional time domain equalizer must be set before the f...
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IPC IPC(8): H04L25/03
CPCH04L25/03006H04L25/03012H04L25/03878H04L2025/03445
Inventor 周禹伸廖懿颖
Owner MEDIATEK INC