Abstract: A wireless communication device comprises an input terminal configured to communicate data with a processor. A segregation circuit (150) is coupled to the input terminal and configured to identify predetermined data and to separate more important data from less important data. A memory (112) is configured to store at least one parameter relevant to the wireless communication protocol. A modem (110) is coupled to segregation circuit and the memory (112) and is configured to communicate using a wireless protocol over a wireless channel, and includes a framer (152) configured to fragment the segregated data based at least in part on the at least one parameter stored in the memory. In one aspect of the invention, the wireless protocol is 802.11. Advantages of the invention include the ability to achieve high quality video communication over a wireless communication link with less chance of dropping important data.

Abstract: A system, apparatus and methods are described that select a guard interval length (345) for a multi-path communications channel. In one embodiment, the guard interval length is selected based on a relationship between a selected coherence bandwidth (335) and a RMS delay (340) of the communication channel.

Abstract: The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas (ant?—1, ant?_N) is formed, and multiple second data streams (610a, 610u) are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed (611a, 611u). During successive transmission intervals (617), the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.

Abstract: The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed (ant1, ant_N), and multiple second data streams (311, 312) are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving (313, 314) of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.

Abstract: A system and method provides extended convolutional coding for packets/frames or superframes used in wireless transmission. A wireless system has an extended convolutional encoder/decoder, a wireless network, a server having an extended convolutional encoding/decoding module, one or more clients, at least one of which performs extended convolutional encoding/decoding; and a wireless transmission unit for the server and one or more clients to communicate via the wireless network. A method for providing the extended convolutional encoding includes the steps of retrieving a set of codes from a database that has a maximal-minimal free distance within a certain range; selecting a subset of the retrieved codes that have the smallest number of paths at the maximal-minimal free distance; and finding extended convolutional codes by selecting a code having a certain rate from the subset of codes that have the smallest number of paths at increased free distances to provide the best candidates.

Abstract: A system and method for a simplified Maximum Likelihood (ML) decoding (203) for MIMO systems is provided. The full ML decoding gives the lower bound of the decoding for CC coded MIMO systems. However, the computation cost is too high to be implemented in real system. Many alternative methods have been proposed for the decoding. Among them, weighted Zero Forcing (WZF) is one that can give affordable performance with reasonable computation complexity but there are several dB of performance gap for the WZF decoding and ML decoding. This present invention discloses a decoding system and method having improved performance over WZF decoding with affordable implementation complexity.

Abstract: A wireless communication device includes an input/output terminal. A memory is configured to store parameters relevant to a wireless communication protocol. A modem is coupled to the input/output terminal and the memory and configured to operate a wireless protocol over a wireless channel with other modems based at least in part on the parameters stored in the memory. A logic circuit is coupled to the modem and the memory and configured to receive information related to wireless channel conditions and update at least one parameter in the memory. In one aspect of the invention, the wireless protocol is 802.11. Advantages of the invention include the ability to achieve higher wireless communication throughput due to the dynamic setting of the communication parameters, for example, the fragmentation threshold.

Abstract: A system and method for a simplified Maximum Likelihood (ML) decoding (203) for MIMO systems is provided. The full ML decoding gives the lower bound of the decoding for CC coded MIMO systems. However, the computation cost is too high to be implemented in real system. Many alternative methods have been proposed for the decoding. Among them, weighted Zero Forcing (WZF) is one that can give affordable performance with reasonable computation complexity but there are several dB of performance gap for the WZF decoding and ML decoding. This present invention discloses a decoding system and method having improved performance over WZF decoding with affordable implementation complexity.

Abstract: A system, apparatus and methods are described that select a guard interval length (345) for a multi-path communications channel. In one embodiment, the guard interval length is selected based on a relationship between a selected coherence bandwidth (335) and a RMS delay (340) of the communication channel.

Abstract: The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.

Abstract: A system, apparatus and methods are described that identify a maximum cyclic delay and corresponding cyclic prefix for a multi-path communications channel. In one embodiment, the maximum cyclic delay (245) is identified based on a relationship between a selected covariance bandwidth (235) and RMS delay (240) of the OFDM channel.

Abstract: The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas (ant?_1, ant?_) is formed, and multiple second data streams (610a, 610u) are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed (611a, 611u). During successive transmission intervals (617), the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.

Abstract: Method, frame definitions (300 400 500 700 800 1000 1200 1300 1400) and system for transmission of an aggregation of packets which includes a plurality of Medium Access Control (MAC) Protocol Data Units (MPDUs) or PLCP (Physical Layer Convergence Protocol) Protocol Data Units (PPDUs) intended for one or several receivers and transmitted at one or several different Physical (PHY) rates. In some aspects of the invention, a pre-amble, rsp. mid-amble (415.i 515.i 715.i 815.i 1015.i 1215.i 1315.i) is transmitted in-between each or between multiples of MPDUs or PPDUs allowing receiver devices to go into sleep mode and wake-up during the aggregate or packet burst. Furthermore, information is transmitted at the beginning of the aggregate/packet burst, which allows devices to deduce the position of MPDUs/PPDUs or multiples of MPDUs/PPDUs in the aggregate. MPDUs or PPDUs are grouped in order to enable efficient sleep times of the receiving devices.

Abstract: A system and method for providing increased forward error correction by providing extended convolutional coding for packets/frames or superframes used in wireless transmission. A wireless system having an extended convolutional encoder/decoder therein, includes a wireless network, a server having an extended convolutional encoding/decoding module, one or more clients, at least one of which is being adapted for extended convolutional encoding/decoding; and a wireless transmission unit for the server and one or more clients to communicate via the wireless network.

Abstract: A wireless communication device comprises an input terminal configured to communicate data with a processor. A segregation circuit (150) is coupled to the input terminal and configured to identify predetermined data and to separate more important data from less important data. A memory (112) is configured to store at least one parameter relevant to the wireless communication protocol. A modem (110) is coupled to segregation circuit and the memory (112) and is configured to communicate using a wireless protocol over a wireless channel, and includes a framer (152) configured to fragment the segregated data based at least in part on the at least one parameter stored in the memory. In one aspect of the invention, the wireless protocol is 802.11. Advantages of the invention include the ability to achieve high quality video communication over a wireless communication link with less chance of dropping important data.