Communication device
First Claim
1. A communication device for transmitting and/or receiving signals by using a communication antenna, said communication device comprising:
- signal characteristic information detection means for detecting information regarding signal characteristics of a calibration signal contained in a signal received by the communication antenna;
calibration means for calibrating a communication antenna chain based on the signal characteristic information detected by said signal characteristic information detection means;
calibration signal cancellation means for removing a signal identical or substantially identical to the calibration signal from the signal received by the communication antenna; and
receive signal processing means for processing the received signal which is diminished by the signal identical or substantially identical to the calibration signal.
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Accused Products
Abstract
A communication device for transmitting and/or receiving signals by using a communication antenna includes signal characteristic information detection means for detecting information regarding signal characteristics of a calibration signal which are contained in a signal received by the communication antenna, calibration means for calibrating a communication antenna chain based on the detected signal characteristic information, and cancellation signal generating means for generating a cancellation signal corresponding to a calibration signal contained in the signal received by the communication antenna based on the calibration signal. The device also includes signal cancellation-by-subtraction means for subtracting the generated cancellation signal from the signal received by the communication antenna, and receive signal processing means for processing the received signal that is diminished by the cancellation signal.
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Citations
19 Claims
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1. A communication device for transmitting and/or receiving signals by using a communication antenna, said communication device comprising:
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signal characteristic information detection means for detecting information regarding signal characteristics of a calibration signal contained in a signal received by the communication antenna;
calibration means for calibrating a communication antenna chain based on the signal characteristic information detected by said signal characteristic information detection means;
calibration signal cancellation means for removing a signal identical or substantially identical to the calibration signal from the signal received by the communication antenna; and
receive signal processing means for processing the received signal which is diminished by the signal identical or substantially identical to the calibration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A CDMA base station comprising:
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n number of communication antennas constituting an adaptive array antenna, n being greater than 1;
n number of transceiver units;
n number of calibration signal cancellers, said n number of communication antennas, said n number of transceiver units, and said n number of calibration signal cancellers constituting n number of communication antenna chains; and
a user-segregated AAA signal processor and discriminator which is common to said n number of communication antenna chains, wherein;
each calibration signal canceller includes a despreader, a phase/gain error detector, a calibration signal generator, a complex multiplier and a subtracter;
each communication antenna is operable to transmit and receive spread spectrum signals to and from mobile stations by radio;
each transceiver unit is operable to conduct receive processing consisting of frequency-converting and orthogonally detecting received signals acquired from the associated communication antenna and outputting the result of the orthogonal detection to the associated calibration signal canceller, and to conduct transmit processing consisting of orthogonally modulating and frequency-converting a transmit signal received from the associated calibration signal canceller and outputting the result to the associated communication antenna;
for each calibration signal canceller, said despreader is operable to acquire the received signal from the associated communication antenna, to despread the received signal by using a spreading code corresponding to the calibration signal, thereby detecting the calibration signal contained in the received signal, and to output the detection result to the associated phase/gain error detector, wherein said associated phase/gain error detector is operable to detect the phase variation and gain variation of the calibration signal based on the detection result received from said despreader, to delete the phase component of the calibration signal produced on the calibration signal transmission side from the received calibration signal, and to output the result after deletion to the associated complex multiplier, the associated calibration signal is operable to generate a signal identical to the calibration signal transmitted from the calibration signal transmission side and to output the generated signal to the associated complex multiplier, said associated complex multiplier is operable to complex-multiply the result after deletion received from said associated phase/gain error detector and the generated signal received from said associated calibration signal generator, and to output the multiplication result to the associated subtracter as a cancellation signal, said associated subtracter is operable to subtract the cancellation signal received from said associated complex multiplier from the received signal of the associated communication antenna chain input thereto by the associated transceiver unit, and to output the received signal after subtraction to said user-segregated AAA signal processor and discriminator; and
said user-segregated AAA signal processor and discriminator is operable to conduct receive processing consisting of acquiring the received signals of the communication antenna chains from the calibration signal cancellers, multiplying the received signals of the communication antenna chains and receive weights which are applied to said communication antenna chains, and synthesizing the multiplication results for all communication antenna chains so as to produce a synthesis result that is a received signal of said adaptive array antenna, wherein the receive processing is performed for every mobile station, conduct transmit processing consisting of modulating user specific data for X′
number of users, summing the modulated signals so as to produce transmit signals, and multiplying the transmit signals and transmit weights which are applied to said communication antenna chains, andoutput the multiplication results for the respective communication antenna chains to said transceiver units via said calibration signal cancellers. - View Dependent Claims (18, 19)
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Specification