Smart antenna communication system for signal calibration
AssigneeSamsung Electronics Co., Ltd.
InventorsHeon-Ki Chae, Young-Hoon Kwon, Jang-Hoon Yang
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Abstract
A calibration apparatus and method for controlling the phase and amplitude of a signal in a smart antenna multicarrier communication system are provided. A calibration signal is allocated to remaining carriers after allocating carriers to a data signal, prior to transmission. Thus, the efficiency of frequency resources for data transmission is increased.
Claims20
A smart antenna communication system comprising:
- a scheduler for allocating a data signal to a plurality of carriers as data carriers, providing the data signal to a baseband processor, and controlling a calibration processor and a controller to generate a calibration signal to be allocated to non-data carriers to which the data signal is not allocated;
- the calibration processor and the controller for generating the calibration signal on the non-data carriers under the control of the scheduler, and calculating a calibration vector using the calibration signal and a feedback calibration signal, being the calibration signal passed through a transmission path;
- and
- the baseband processor for calibrating a beamforming weight vector for a data signal with the calibration vector and transmitting the calibrated data signal in the transmission path.
A smart antenna communication system comprising:
- a scheduler for controlling a calibration signal generator to generate a calibration signal to be allocated to non-data carriers other than data carriers on which a data signal is received from a mobile station;
- a calibration processor and controller for generating the calibration signal on the non-data carriers under the control of the scheduler and calculating a calibration vector using the calibration signal and a feedback calibration signal being the calibration signal passed through a reception path;
- and
- a baseband processor for calibrating a beamforming weight vector for a data signal with the calibration vector and transmitting the calibrated data signal in the reception path.
A method of allocating a calibration signal to carriers in a smart antenna communication system, comprising the steps of:
- comparing a timer value of the nth carrier with a timer threshold (Time_threshold);
- excluding the nth carrier as unavailable as a data carrier if timer value of the nth carrier is greater than the threshold;
- allocating data on the nth carrier if timer value of the nth carrier is not greater than the timer threshold;
- allocating a calibration signal on the nth carrier if data is not allocated in the step of allocating data.
A method of estimating a calibration vector in a smart antenna communication system, comprising the steps of:
- receiving a feedback calibration signal on a carrier to which a calibration signal is allocated;
- updating a memory having the values of the feedback calibration signal received on previous carriers with the value of the feedback calibration signal;
- repeating the reception step and the updating step for all carriers of a symbol;
- and
- calculating a calibration vector for each of the carriers using the values of the feedback calibration signal stored in the memory.
A signal calibration method in a smart antenna communication system, comprising the steps of:
- allocating a data signal to a plurality of carriers as data carriers;
- allocating a calibration signal to non-data carriers to which the data signal is not allocated and transmitting the calibration signal in a transmission path;
- calculating a calibration vector using the calibration signal and a feedback calibration signal received from the transmission path;
- and
- calibrating a beamforming weight vector for the data signal using the calibration vector and transmitting the calibrated data signal in the transmission path.
Dependencies are inferred from the claim text.