Receiving apparatus and array combining method

Details Receiving apparatus and array combining method Receiving apparatus and array combining method

2000-06-05

2004-07-13

Fan, Chieh M. (Department: 2634)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S229000, C375S267000

Reexamination Certificate

active

06763077

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a receiving apparatus having an adaptive array antenna and relates to an array combing method.
2. Description of the Related Art
The following will explain a convention receiving apparatus.
FIG. 1
is a primary block diagram showing a schematic configuration of the conventional receiving apparatus. In the explanation set forth below, it is assumed that the number of branches is two.
In
FIG. 1
, antenna elements
11
-
1
and
11
-
2
are provided on a branch-by-branch basis to receive radio signals. Reception processing selections
12
-
1
and
12
-
2
are provided on a branch-by-branch basis to perform reception processing with respect to received signals. A timing control selection
13
acquires symbol synch timing to perform control of synch timing in the apparatus. A demodulation processing section
14
performs training processing and tracking processing with respect ti the output signals of reception processing sections
12
-
1
and
12
-
2
.
A configuration of demodulation processing section
14
will be explained with reference to FIG.
2
.
FIG. 2
is a primary block diagram showing a schematic configuration of demodulation, processing section
14
of the conventional receiving apparatus.
In
FIG. 2
, FFFs (Feed Forward Filter)
21
-
1
and
21
-
2
are provided on a branch-branch basis to absorb timing jitter and synch shift. A tap coefficient estimating section
22
estimates tap coefficients of FFFs
21
-
1
and
21
-
2
based on a result of equalization processing made by a Viterbi equalizer
24
to be described later.
A combing device
23
combines the received signals of the respective branches output from FFF
21
. The Viterbi equalizer
24
provides equalization processing with a Viterbi algorithm to the received signals combined by the combing device
23
based on the symbol synch timing acquired by the timing control section
13
. Since this equalization processing is already known, the specific explanation will be omitted.
Thus, the conventional receiving apparatus passes the received signal through FFF every branch in the first part of array combine processing to update the tap coefficient of the FFF adaptively, thereby absorbing timing jitter and synch shift.
However, the conventional receiving apparatus has FFF every branch, and this causes a problem in which the amount of operations is increased so that much converging time for tap coefficient is required.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a receiving apparatus in which the amount of operations is small and converging time for tap coefficient is short, and to provided, the array combing method.
The present invention calculates a weighting factor from a tap coefficient estimated by training processing, assigns weights to the received signals of the respective branches using the calculated weighting factor to combine these signals, and passes the combined signal through FFF, whereby achieving the above object.


REFERENCES:
patent: 3633107 (1972-01-01), Brady
patent: 5646958 (1997-07-01), Tsujimoto
patent: 5689528 (1997-11-01), Tsujimoto
patent: 5844951 (1998-12-01), Proakis et al.
patent: 6240149 (2001-05-01), Yukitomo et al.
patent: 10336083 (1998-12-01), None
K. Fukawa, “A Spatio-Temporal Equalization Technique in High Speed Digital Mobile Communications—An Adaptive Array-MLSE Cascading Connection for Sparse Channel Signal Combining,” IEICE General Conference 1999, B-5-41, with partial English translation of pertinent portion.

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