Adaptive equalizing device

Details Adaptive equalizing device Adaptive equalizing device

1998-11-10

2002-08-13

Pham, Chi (Department: 2631)

Pulse or digital communications

Equalizers

Automatic

C375S231000

Reexamination Certificate

active

06434192

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an adaptive equalizing device used in a mobile communication.
2. Description of the Related Art
With the progress of communication technologies, a high speed data transmission has been required in the mobile communication. In a radio communication where a data transfer rate is more than several Mbps, multipath propagation generates, resulting in a deterioration of a communication quality. To prevent the deterioration, an adaptive equalizer is provided in a radio transmission/reception apparatus.
FIG.1
is used to explain a configuration of a conventional filter bank used in an adaptive equalizer. The filter bank is primarily composed of a splitting section for splitting an input signal into M frequency bands and a synthesizing section for rearranging split signals to reconstruct an original signal.
The splitting section is composed of analysis filter
1
and sampling rate converter
2
. Analysis filter
1
is composed of M analysis filters Hi (z) with different filter coefficients to split the input signal into M frequency bands. A split signal is downsampled at a sampling rate of 1/M times in sampling rate converter
2
provided behind each analysis filter
1
.
The signal is upsampled at a sampling rate of M times in sampling rate converter
3
, then reconstructed into the original signal by synthesis filter
4
. This synthesis filter
4
is composed of M analysis filters Gi(z) with different filter coefficients.
The input signal is split into M frequency bands by the analysis filter
1
and sampling rate converter
2
and will be output ideally as showed in FIG.
2
.
However, since the above-mentioned conventional filter bank can not reconstruct split signals properly when a distortion generates in split signals, there is a problem that the conventional filter bank is not applicable to the mobile communication in which a fading distortion and so on occur.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an adaptive equalizing device capable of compensating a distortion fraction of each band split signal and of reconstructing split signals properly by a filter bank.
The object is achieved by the adaptive equalizing device capable of performing training processing based on a known training signal received in advance to obtain a distortion degree of a signal, compensating the distortion fraction of the signal, and reconstructing the split signals properly by the filter bank.


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An English Language abstract of JP 53-074815.
An English Language abstract of JP 54-096945.
An English Language abstract of JP 54-107612.
An English Language abstract of JP 59-064932.
An English Language abstract of JP 62-125722.
An English Language abstract of JP 3-069216.
An English Language abstract of JP 8-046556.
An English Language abstract of JP 8-079137.
An English Language abstract of JP 8-213940.
An English Language abstract of JP 8-307323.
An English Language abstract of JP 7-504075(WIPO).
An English Language abstract of JP 6-508482(WIPO).

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