Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2001-05-16
2004-08-17
Vuong, Quochien B. (Department: 2685)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S562100, C455S255000, C455S447000
Reexamination Certificate
active
06778843
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an array antenna transceiver, and more particularly to an array antenna transceiver in which transmission and reception can be continued even when a reference signal supply system is failed.
2. Description of the Related Art
An array antenna transceiver has a transceiver section provided for every antenna element and a transceiver section control circuit which controls them. In case of reception, the array antenna transceiver carries out a process for frequency conversion to a signal received by each antenna element in the transceiver section and sends to the transceiver section control circuit, which carries out a weighting operation and a synthesizing operation. In case of transmission, a signal is subjected to a weighting operation in the transceiver section control circuit and is sent to the transceiver section, which carries out a transmission process for frequency conversion and transmits from each antenna element.
FIG. 1
is a block diagram of a conventional array antenna transceiver. Referring to
FIG. 1
, the conventional array antenna transceiver is composed of an antenna section
201
, N transceiver sections
202
-
1
to
202
-N, N reference signals
203
-
1
to
203
-N, a transceiver section control circuit
204
, a hybrid
205
, and a common reference signal generating section
206
. Generally, the transceiver sections are provided for inputs and outputs of the antenna sections, and the N transceiver sections are provided in this conventional example. To supply a reference signal, a synchronization signal is supplied to the common reference signal generating section
206
, which generates a reference signal. The generated reference signal is distributed to the N transceiver sections
202
-
1
to
202
-N by the hybrid
205
. Through this method, the reference signal is generated by the common reference signal generating section
206
and supplied to all the transceiver sections. Therefore, the reference signals can be supplied to all the transceiver sections from a single signal source in common.
In the conventional array antenna transceiver shown in
FIG. 1
, the common reference signal generating section is provided outside of the respective transceiver sections as a reference signal source, and the output thereof is distributed to the respective transceiver sections. Thus, synchronization between the transceiver sections can be established. The reason why the synchronization is established between the transceiver sections in this way is that the weighting operation and synthesizing operation to a transmission or reception signal cannot be carried out with high precision, unless the transceiver sections for the number of antenna elements are not synchronous with each other in the array antenna transceiver.
On the other hand, the method of generating a reference signal individually for every transceiver section without using the common reference signal generating section could be thought of. However, in such a case, there is possibility that the reference signals different in phase, amplitude and frequency are supplied to the respective transceiver sections. Therefore, to establish synchronization between the transceiver sections, calibration would have to be separately carried out.
For the above reason, in the conventional array antenna transceiver, the signal common to all the transceiver sections is supplied from the common reference signal generating section. In this way, it is possible to carry out the weighting operation and the synthesizing operation to the transmission and reception signals in the high precision without carrying out any calibration.
However, in the above-mentioned conventional array antenna transceiver, the signal transmission and reception cannot be carried out in all the transceiver blocks when the common reference signal generating section is set to a non-operating state because of a kind of trouble.
In conjunction with an array antenna forming method is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 5-191128). In this reference, a unit reception system is formed of unit receiving blocks
1
-
1
to
1
-N, phase synchronizing blocks
2
-
1
to N-
1
and phase reference block
3
, and the unit receiving block is composed of a reception antenna
7
and a reception converter
8
. A local signal frequency for the reception converter
8
is locked to a predetermined frequency based on the external reference signal. The external reference signal is supplied into the converter through an output terminal of the reception converter
8
. By using the reference signal as a common reference signal to the respective reception converters
8
, the local signal frequencies of the converters are made common without local distribution in a high frequency band. In this way, all the reception converters can be made operated in common even if the number of elements of an adaptive array antenna is many.
Also, an antenna apparatus is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 5-281326). In this reference, the antenna apparatus is composed of a first antenna row which is composed of at least two antennas which are arranged in a horizontal direction orthogonal to a radio wave arrival direction and a radio wave facing plane which is perpendicular to the radio wave arrival direction. A drive section drives the first antenna row to an azimuth direction. A phase difference detecting section detects the phase difference between the reception signals of the antennas of the first antenna row. A drive control section controls the drive section to drive the first antenna row by means in the direction in which the phase difference detected by the phase difference detecting section is zero. A second antenna row is composed of a plurality of antennas arranged in a vertical direction orthogonal to the horizontal direction in parallel to each other. A drive section drives the second antenna row in an azimuth direction. A drive control section controls to the drive section to drive the second antenna row into the substantially same direction as the directing direction of the first antenna row. A reference signal generation section generates a reference signal from the reception signal of at least one of the antennas in the first and second antenna rows. A signal control section generates a comparison signal from the reception signal of at least one of the other antennas and converts the frequency of the comparison signal such that the frequency of the comparison signal is coincident with that of the reference signal, and controls the phase of the comparison signal such that the phase of the comparison signal is coincident with the phase of the reference signal. A synthesizing section synthesizes the reference signal and the comparison signal controlled by the signal control section.
Also, an adaptive array antenna apparatus of an LMS (least mean square) system is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 7-154129). In this reference, the adaptive array antenna apparatus is composed of a plurality of antennas and multiplying sections. The multiplying sections multiply weighting coefficients individually to radio wave signals received by said a plurality of antennas, respectively. An adding section adds the respective output signals of the multiplying section to produce an output signal of the antenna apparatus. An extracting section extracts a pilot signal indicating predetermined contents from the output signal of the adding section. A reference signal generating section compensates the output signal of the adding section based on the pilot signal extracted by the extracting section to generate a reference signal. A subtracting section calculates a signal indicative of the difference between the output signal of the adding section and the reference signal. A control section controls each weighting coefficient of the multiplying section to minimize the difference signal. A pattern signal is subjected to time division Multiplexing wi
Foley & Lardner LLP
Le Lana
NEC Corporation
Vuong Quochien B.
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