The patent's inventors are Sedarat, Hossein (
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "Communication systems are widely used in computer and device networks to communicate information between computers and other electronic devices. Transceivers of a communication system send and receive data over a link (including one or more channels) of a communication network to communicate with other transceivers. A transceiver includes a transmitter for sending information across a link, and a receiver for receiving information from a link. The receiver detects transmitted data on the link and converts the data into a form usable by the system connected to the transceiver.
"In some communication systems known as wireline communication systems, the communicated data is encoded on a modulated signal which is typically transmitted differentially over a pair of wires. In such systems, the common-mode signal on the two wires does not carry any information and it is typically noise from electro-magnetic interference and crosstalk. In a perfect system, the common-mode signal is very well balanced and does not convert to a differential signal. However, in any practical system the transversal conversion loss (TCL) is finite which means some portion of the common-mode signal shows up as differential noise at the receiver input. The imbalance that would cause a finite TCL can be anywhere in the signal path including the wireline channel, the connectors at both end of the channel, and even the components that are used to detect the differential signal.
"Examples of wireline communication systems that are susceptible to common-mode noise include various varieties of Digital Subscriber Line (DSL) and Ethernet over copper, such as 10GBASE-T allowing 10 gigabit/second connections over unshielded or shielded twisted pair cables. Although the information carrying signal of the system does not have a common-mode component, there are other sources that can induce a common-mode signal in the communication channel. One particularly important source of common-mode noise is radio frequency interference (RFI). The sources of
"Accordingly, what is needed are systems and methods that reject or reduce radio frequency (RF) interference in the performance of wireline communication systems, providing more robust communication in such systems."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "A system and method for rejecting RF interference in communication systems is disclosed. In one aspect, a method for rejecting radio frequency (RF) interference includes receiving a signal on a signal path of a receiver from a communication channel connected to the signal path, the signal including one or more received signal components having a frequency within a predetermined subset range of frequencies within an operating signal bandwidth of the receiver. The one or more received signal components are attenuated using a notch filter to reduce RF interference obtained during transmission of the signal over the communication channel. In some embodiments, the one or more signal components have been boosted in power at a link partner transmitter connected to the communication channel.
"In another aspect, a method for rejecting radio frequency (RF) interference in a communication system includes receiving a signal on a signal path of a receiver from a communication channel connected to the receiver, the received signal including one or more received signal components having a frequency outside an operating signal bandwidth of the receiver. The receiver is included in a transceiver that also includes a transmitter sending transmitted signals on the communication channel. The one or more received signal components are attenuated using a filter to reduce out-of-band RF interference obtained during transmission of the received signal over the communication channel, where the filter is connected to the signal path of the receiver and is not connected to a signal path of the transmitter.
"In another aspect, a communication system for rejecting radio frequency (RF) interference includes a transmitter and a receiver. The transmitter includes a transmit signal path connected to a near end of a communication channel and transmitting a signal on the communication channel. The transmitter also includes a boost block in the transmit signal path, the boost block boosting power of one or more desired signal components of the signal transmitted on the communication channel in a predetermined subset range of frequencies within an operating signal bandwidth of the communication system. The receiver includes a receive signal path connected to a far end of the communication channel and receiving the signal from the channel, and a notch filter in the receive signal path. The notch filter is configured to attenuate all components of the received signal within the predetermined subset range of frequencies, where the attenuated components include the one or more desired signal components. The attenuating of all the components of the received signal reduces RF interference obtained in transmitting the signal over the communication channel
"The inventions disclosed herein allow RF interference to be rejected in channels of a communication system. Out-of-band and in-band interference can be rejected, allowing more accurate and robust communication of signals."
For the URL and additional information on this patent, see: Sedarat, Hossein; Farjadrad, Ramin; Shirani, Ramin. Rejecting RF Interference in Communication Systems. U.S. Patent Number 8625704, filed
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