Receiver and wireless signal receiving method

Abstract

Under the control of analog auto gain control signal AAGC, this means handles the gain-changing process against the analog band-pass signal input to the receiver, does digital sampling to gain the digital band-pass signal, then splits this signal into two ways, the feedback branch and the forward branch, then tests the real signal envelope power of digital band-pass signal on the feedback branch to gain the envelop power, then produces the control signal AAGC using the gained envelope power. Finally, it handles digital process against the digital band-pass signal on the forward branch to gain the bit flow. Due to this means calculates directly the envelope power using a few sample values of the digital sampled real signal without needing lots of sample values and not calculating the power after the digital filter, the AAGC loop delay is reduced and the AAGC control ability is raised. An instant AAGC control against wide-band signal can be carried out.

Description

technical field [0001] The invention relates to wireless receiving technology, in particular to a receiver and a method for receiving wireless signals. Background technique [0002] In a wireless communication system or a radar system, some device is required to receive wireless signals, which is usually called a wireless receiver or receiver. There are many types of receivers, and dynamic range is an important indicator to measure the quality of a receiver. [0003] The dynamic range of the receiver is generally divided into simultaneous dynamic range and non-simultaneous dynamic range. Among them, the dynamic range at the same time is the ability of the receiver to correctly demodulate the large signal and the small signal when the large signal and the small signal exist at the same time, and its value is generally the maximum value of the power ratio between the large signal and the small signal. The non-simultaneous dynamic range is the ability of the receiver to corre...

AI Technical Summary

Problems solved by technology

In the first prior art, since the average power detection method based on the real signal is adopted, a section of signal, usually more than 100 sample points, is required to obtain the average power, so it will naturally cause an unavoidable loop delay

In the second prior art, although only one sample point is needed to obtain the envelope power from the complex signal, the envelope detection starts after the digital filter, and the digital filter has a certain delay , so it also caused the inevitable loop delay

[0018] Therefore, whether it is the first or the second prior art, the delay of the AAGC loop is relatively long. When the AAGC starts to control according to the result of the power detection, the power of the input signal may not be the power of the detected signal. The dynamics of the signal after AAGC control is still relatively large, which leads to the weakening of the effect of AAGC control or even the loss of the effect of AAGC control, and it is difficult to ensure that the output signal of the receiver is not distorted

In addition, due to the relatively long delay of the AAGC loop, it will be difficult to perform transient AAGC control on large-bandwidth signals, and it is also difficult to ensure that the receiver output signal is not distorted

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