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Calibration method performing spectrum analysis upon test signal and associated apparatus for communication system

a spectrum analysis and spectrum analysis technology, applied in the direction of electrical equipment, transmission monitoring, receiver monitoring, etc., can solve the problems of reducing the overall performance of the communication system and poor bit error rate (ber)

Active Publication Date: 2016-02-23
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The proposed solution effectively calibrates wireless transceivers to improve IQ balance, reducing BER and image signal issues, thereby enhancing the overall performance and reliability of high-level QAM communication systems across different operational conditions.

Problems solved by technology

One of the most significant factors that affect the EVM is In-phase Quadrature-phase imbalance (IQ imbalance), whose root cause is IQ mismatch of a Radio Frequency (RF) circuit, where even a slight mismatch can reduce overall performance of the communication system.
Specifically, the imperfect Quadrature Amplitude Modulation / Demodulation introduced by mismatches leads to a poor Bit Error Rate (BER).
A serious IQ imbalance will lead to a small IMR, and vice versa.
Thus, when and how to perform calibration for an IQ mismatch has become an important issue in this field.

Method used

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  • Calibration method performing spectrum analysis upon test signal and associated apparatus for communication system
  • Calibration method performing spectrum analysis upon test signal and associated apparatus for communication system
  • Calibration method performing spectrum analysis upon test signal and associated apparatus for communication system

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first embodiment

[0024]Please refer to FIG. 2, which is a diagram illustrating a communication system having an embedded calibration apparatus according to the present invention. The communication system 200 includes at least one portion (e.g. a portion or all) of an electronic device. For example, the apparatus 100 may comprise a portion of the electronic device mentioned above, and more particularly, can be a control circuit such as an integrated circuit (IC) within the electronic device. In another example, the apparatus 100 can be the whole of the electronic device mentioned above. Examples of the electronic device may include, but are not limited to, a mobile phone (e.g. a multifunctional mobile phone), a mobile computer (e.g. tablet computer), a personal digital assistant (PDA), and a personal computer such as a laptop computer. For example, the communication system 200 may be a process module of the electronic device, such as a processor. In another example, the communication system 200 may b...

third embodiment

[0041]Please refer to FIG. 7, which is a diagram illustrating a communication system having an embedded calibration apparatus according to the present invention. As shown in FIG. 7, the communication system 700 includes a test signal generator 702, the calibration coefficient unit 204 and the transmitter 206 of the aforementioned embodiment, a receiver 710, a spectrum analysis unit 712 and a control unit 714. According to this embodiment, each time the communication system 700 is reactivated (e.g. after being powered on or reset) but before the normal data transmission and reception mode starts, the abovementioned transmitter calibration process are performed on the receiver 206, wherein a low-noise amplifier 756, a mixer 742 and a mixer 750 of the receiver 710 are skipped / omitted. After the calibration coefficients (e.g. the first coefficient X and the second coefficient Y) of the transmitter 206 are confirmed, the calibration process continues to improve mismatches of the circuit ...

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Abstract

A calibration method for calibrating a communication system includes: generating a test signal at a transmitter; configuring at least one calibration coefficient at the transmitter; configuring at least one calibration coefficient at the receiver; transmitting the test signal to a receiver via the calibration coefficient; performing a spectrum analysis upon the test signal received by the receiver to generate a spectrum analysis result; and adjusting the calibration coefficient according to the spectrum analysis result to calibrate the transmitter. In addition, a calibration method is also provided for calibrating a receiver of a communication system, and related calibration apparatuses are further provided.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The disclosed embodiments of the present invention relate to calibration methods and associated apparatuses for a communication system, and more particularly, to calibration methods and associated apparatuses for a wireless transceiver based on a Quadrature Amplitude Modulation (QAM).[0003]2. Description of the Prior Art[0004]Transmission rates for communication systems have become higher as the communication systems develop. As a signal modulated by a more complicated modulation technique contains more information than a signal modulated by a less complicated modulation technique, designers can raise the transmission rate by adopting high level complicated process, such as 64-Quadrature Amplitude Modulation (64-QAM), or even 256-QAM. In order to optimize transmission of a high level Quadrature Amplitude Modulation, an Error Vector Magnitude (EVM) of a communication system has to be raised. One of the most significant f...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04B17/21H04B17/14H04B17/00
CPCH04B17/21H04B17/0085H04B17/14
Inventor WU, CHIH-YUNGCHANG, CHUNG-YAO
Owner REALTEK SEMICON CORP