Low power consumption automatic gain control method suitable for ASK analog receiver

Abstract

The invention discloses a low power consumption automatic gain control method suitable for an ASK analog receiver, belonging to the wireless communication field. The method comprises the following steps: utilizing a principle of a scrambler in a digital communication system; and judging that the gain of a forward link of the current receiver is too high or too low according to binary code stream information output by the ASK analog receiver, thus automatically regulating the gain in a programmable gain amplifier (PGA) in the forward link, and realizing the automatic gain control function of the ASK analog receiver. In order to shorten the gain regulation time, the method of the invention also adopts a method for improving the gain regulation based on a binary search algorithm. The automatic gain control method does not need to use a multi-bit analog to digital converter, and does not introduce an analog closed loop, thus the automatic gain control scheme can support higher data rate, has low power consumption, and can be applied in the ASK receiver with low power consumption and high data rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a low-power automatic gain control method suitable for an ASK analog receiver. Background technique [0002] The ASK (binary amplitude keying) modulation method is widely used in various short-distance wireless communication systems. Due to the particularity of the application environment, these wireless communication systems have extremely strict requirements on power consumption. Considering that the analog-to-digital converter needs to consume relatively large power consumption, it is more common to realize the demodulation of the ASK signal in the analog circuit domain and avoid the use of the analog-to-digital converter, so as to directly restore the original binary code stream through the analog circuit Methods. In this kind of ASK receiver, considering the change of wireless signal strength, an automatic gain control loop is needed to automatica...

AI Technical Summary

Problems solved by technology

The dominant pole introduced by the integrator in this analog closed loop limits the bandwidth of the automatic gain control loop, thereby limiting the data rate of the receiver

At the same time, the pole frequency introduced by the peak detector in the closed loop is also low. In order to ensure the stability of the closed loop, the automatic gain control loop needs to consume high power consumption, and the design complexity is also greatly increased.

Therefore, such an analog automatic gain control loop is usually difficult to apply in a low-power, high-data-rate ASK receiver

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