Noise and Interference Cancellation using Signal Cancellation Techniques

摘要

The present invention relates generally to use of bonding and removing the principle of the known technique is actually a signal to change the external environment This presents a possible adaptation of the signal in the binding and removal method, and to describe a typical example according to the presented method based on the radio repeater for transmitting and receiving the same frequency and ease of understanding. So that the radio repeater using the same frequency, since the transmission signal is input to the amplifier in combination with the received feedback signal to the feedback signal fed back to the receiving antenna to the receiving antenna is to saturate the amplifier, or is the cause of the oscillation. Thus, a typical wireless repeater in order to remove the feedback signal that is fed back has been fully installed on the remote by separating the transmit and receive antenna and a directional antenna used for excellent directivity. However, the feedback period of the unique characteristics of radio waves, and a wireless communication method that can fundamentally film is not present. Therefore, in the environment that is to be used for the feedback signal cancellation technique for removing the feedback signal that is fed back to the essential can remove the feedback signal by using the principle of coupling and removal of the signal. ; However, the existing scheme and the proposed method in recent years are amplitude, phase, and by adjusting the time delay trying to remove the feedback signal, but has a certain limit, the amplitude in accordance with the characteristics of the different wireless signals from the wireless space, the phase and time delay element has not reached the level that can be adapted to remove the undesired feedback signal to coincide with changes in environment. Further, the complete formulation of the theoretical time is described for the implementation of the delay, but in the field is not possible, and is problematic in the size and weight of the system. Accordingly, the present invention is the amplitude which has been a problem in the various approaches to date adjustment, remove the feedback signal to a new invention for the design and tuning of the phase matching and time delay to prevent saturation, and the oscillation of the amplifier is always constant maximum gain relates to a signal eliminator capable of transmitting a signal.