News Column

Patent Issued for Feed-Forward Control Signaling and Decoding Schemes

July 16, 2014



By a News Reporter-Staff News Editor at Telecommunications Weekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Khojastepour, Mohammad A. (North Brunswick, NJ); Prasad, Narayan (Wyncote, PA); Rangarajan, Sampath (Bridgewater, NJ), filed on August 15, 2013, was published online on July 1, 2014.

The patent's assignee for patent number 8767665 is NEC Laboratories America, Inc. (Princeton, NJ).

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to wireless transmission systems and, more particularly, to the conveyance of control information in such systems.

"In broadband wireless systems, such as Orthogonal Frequency Division Multiple Access (OFDMA) based systems, control information regarding transmitted data streams in the downlink to a mobile user is signaled implicitly via a control channel by a base station in the system. The parameters specified in this information can considerably affect the rate of the transmission and the decoding accuracy. For example, for the Long Term Evolution (LTE)-Advanced standard, one proposal signals the total number of streams, the allocation of stream identifiers to a particular user, and the modulation type utilized by other co-scheduled multiple input-multiple output (MIMO) users in a Multiuser (MU)-MIMO transmission. Here, the control signals are designed by considering all the feed-forward control parameters jointly. For example, for a feed-forward sequence having a length of five bits, the 2^5=32 different possible indices are divided into different sets that are allocated to support 2 stream, 4 stream and 8 stream transmission, respectively."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Exemplary embodiments of the present principles can improve the scope of control information that can be transmitted to receivers by employing the number of transmit antenna in combination with feed-forward control signal parameters.

"One embodiment is directed to a method for decoding parameter allocation information. In accordance with the method, an index indicating selected data stream parameters is received. In addition, an indication of a number of transmit antennas at a transmitter from which the data stream is transmitted is also received. Further, the selected parameters are determined from the index based on the number of transmit antennas at the transmitter. Moreover, data signals are received and processed with a processor in accordance with the selected data stream parameters.

"Another embodiment is directed to a receiver system for decoding parameter allocation information. The system includes a receiver that is configured to receive an index indicating selected data stream parameters for at least one data stream and to receive an indication of a number of transmit antennas at a transmitter from which the at least one data stream is transmitted. The system further includes a processor that is configured to determine the selected parameters from the index based on the number of transmit antennas at the transmitter and to process data signals in accordance with the selected data stream parameters.

"An alternative embodiment is directed to a wireless transmission system. The system includes a plurality of base stations, wherein each base station provides a different number of transmit antennas for the transmission of at least one data stream to a corresponding receiver. In addition, the system includes at least one controller that is configured to select data stream parameters for the corresponding receiver and to determine an index for the selected data stream parameters for transmission to the corresponding receiver by utilizing an indexing scheme. Here, each base station utilizes a different indexing scheme and each indexing scheme is customized to a corresponding number of transmit antennas of a corresponding base station.

"These and other features and advantages will become apparent from the following detailed description of illustrative embodiments thereof, which is to be read in connection with the accompanying drawings."

For additional information on this patent, see: Khojastepour, Mohammad A.; Prasad, Narayan; Rangarajan, Sampath. Feed-Forward Control Signaling and Decoding Schemes. U.S. Patent Number 8767665, filed August 15, 2013, and published online on July 1, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8767665.PN.&OS=PN/8767665RS=PN/8767665

Keywords for this news article include: NEC Laboratories America Inc.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Telecommunications Weekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters