Other

Runcom Technologies, Ltd.

Zion Hadad Communications Ltd.

Runcom Communication Ltd.

Zion Hadad

Ofer Shalem

Michael Erlihson

Vadim Neder

Doron Ezri

Eli Shasha

Baruch Globen

The subject matter discloses an AI (Artificial intelligent) MIMO (Multiple INPUT Multiple Output) radio channel data detector which includes QR decomposition preprocessing of the channel matrix (H) and providing related LLR results to enable the close to optimal data detection.

AI (artificial intelegence) MIMO (multiple input multiple output) detector

In a system packing multiple PDUs on a single physical burst and using OFDM or OFDMA, a synchronization method comprising: a. performing an initial lock; b. processing each new header information, verifying if checksum OK, and if OK&#x2014;remain in (b), system is in locked state; c. activating new header seeker, to enable running window processor to compare the expected checksum with the last byte as tentative checksum; d. declaring Tentative lock, when detecting a checksum correspondence; e. declaring Final lock, when two or more consecutive successful detections of headers, at their expected locations based on prior detections, then Goto (b).

Synchronization system and method

In this application, an algorithm for decoding multiple input-multiple output (MIMO) transmission for communication systems is provided; the algorithm combines sphere decoding (SD) and zero forcing (ZF) techniques to provide near optimal low complexity and high performance constant time modified sphere decoding algorithm; the algorithm was designed especially for large number of transmit antennas, that allows efficient implementation in hardware&#x2014;this is done by limiting the number of overall SD iterations; moreover, matrices with high condition number are more likely to undergo SD.

System and method for low complexity sphere decoding for spatial multiplexing MIMO

A communications system comprising at least one Base Station BS, one or more Satellites and Mobile Stations MS connected therebetween, and wherein the mobile station includes means to calculate Doppler frequency shifts. In a preferred embodiment, the mobile station includes means to measure clock mismatch frequency.

Method for doppler shift estimation and compensation in a communications system

A method for providing a personalized bidirectional channel in broadcasting systems. In cellular broadcasting system the method contains the steps of: allocating a first group of subcarriers to broadcast transmission and a second group of subcarriers to personalized channels; reducing interference in the broadcast transmission by using equalizer; and reducing interference in the personalized channels by using controlled allocation of subcarriers in the second group to each subscriber. In OFDM broadcasting system the method contains the steps of: transmitting OFDM transmission from the base-station to the subscriber units; transmitting from the subscriber units to the base-station signals that are orthogonal to signals transmitted from the base-station; and receiving the orthogonal signals at the base-station.

Cellular network system

A preamble code usable in Orthogonal Frequency Division Multiple Access (OFDMA) for the physical layer (PHY), selected for improved PAPR in a 1024, 512 or 128 FFT OFDMA mode. Tables 2 to 7 detail code sequences having improved PAPR performance. The disclosed codes may be used in cellular wireless.

OFDMA preambles system and method

In a unidirectional or broadcasting communication system using OFDM transmission from a base station to subscriber units, a device for achieving a bi-directional channel comprising: A. a transmitter in the subscriber units for transmitting signals that are orthogonal to signals transmitted from the base station and are also orthogonal to signals from other subscriber units; B. a receiver in the base station for receiving and processing together signals from a plurality of subscriber units; C. a controller for allocating to each subscriber unit several carriers that are separated from each other (not adjacent to each other).

Bi-directional communication channel

A a system for allocating subcarriers to subscribers, comprising a subcarriers allocation controller, connected to a subcarrier modulation unit in a transmitter and to a subcarrier demodulation unit in a receiver for setting a group of subcarriers to be used therein. The transmitter and the receiver are part of the transceiver and subcarriers allocation is made according to a Reed-Solomon code. In a multicarrier system, a method for allocating subcarriers to subscribers, comprising: A. keep a table of R-S codes for frequency group allocation to base stations; B. assign one set of subcarriers based on R-S codes to a base station; C. assign other sets of subcarriers based on R-S codes to other base stations in such a way that adjacent base stations have different R-S codes.

System and method for cellular communications

A system for allocating subcarriers to subscribers, comprising a subcarriers allocation controller, connected to a subcarrier modulation unit in a transmitter and to a subcarrier demodulation unit in a receiver for setting a group of subcarriers to be used therein. The transmitter and the receiver are part of the transceiver and subcarriers allocation is made according to a Reed-Solomon code. In a multicarrier system, a method for allocating subcarriers to subscribers, comprising the steps of: A. keep a table of R-S codes for frequency group allocation to base stations; B. assign one set of subcarriers based on R-S codes to a base station; C. assign other sets of subcarriers based on R-S codes to other base stations in such a way that adjacent base stations have different R-S codes, to minimize the number of collision points therebetween.

A communication system using OFDM transmission from a base station to subscriber units, includes means for achieving a bi-directional channel. These means comprise transmitting means in the subscriber units for the transmission of signal synchronous with the guard time interval in the OFDM transmission, and receiving means in the base station for the reception of the transmitted signals. The system also includes signal shaping means in the receiver of the base station and/or the subscriber unit for the application of a window in time to signals received therein. A communication system includes a combination of CDMA modulation codes and OFDM coding/decoding means to achieve orthogonality between signals from the various users in the uplink. A communication system includes a combination of OFDM and channeling means for achieving orthogonality between signals from the various users in the uplink. Automatic Frequency Control is achieved with means in the mobile unit for achieving a frequency-lock to the base station.

In an OFDM-based receiver, a time synchronization unit comprising: A. a device for extracting pilot signals contained in the OFDM received signal; B. a device for analyzing pilot signals in the frequency domain and for issuing a signal indicative of a synchronization error in the received signal; C. a device for correcting the synchronization error, responsive to the signal indicative of the synchronization error. In an OFDM-based receiver, an automatic frequency correction device in a subscriber unit comprising: A. an inner frequency correction loop for generating a LO frequency related to a frequency of a received signal; B. an outer frequency correction loop for correcting the LO frequency according to instructions received from a base station.

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Rishon Lezion, Israel

Zion Hadad