Abstract: A method and system for transmitting uncompressed video information from a sender to a receiver over a wireless channel is described. Uncompressed video information bits are provided at the sender and the video information bits are packetized into one or more packets. A preamble to precede the data in each packet is provided, where the preamble includes a set of short training sequences and a set of long training sequences. Multiple packets are transmitted from the sender to the receiver over a wireless channel. In certain embodiments, the set of short training sequences includes seven short training sequences and the set of long training sequences includes two long training sequences, and the total length of the preamble is five orthogonal frequency-division multiplexing (OFDM) symbols long.

Abstract: A system and a method of using fast Fourier transform (FFT) based tone interleaver for OFDM are disclosed. One embodiment of the system includes an OFDM transmitter, which includes an inverse fast Fourier transform (IFFT) subsystem. The IFFT subsystem includes a bit-reversal (or quarternary-digit reversal depending on implementation) module followed by a butterfly operator. The bit-reversal (or quarternary-digit reversal) module output is connected to the butterfly operator input. The OFDM transmitter further includes a tone interleaver having an input and an output. The symbol interleaver output is connected to the bit reversal (or quarternary-digit reversal) module input. The tone interleaver is configured to rearrange the input symbol sequence such that the symbol sequence input to the tone interleaver input is the same as the symbol sequence input to the butterfly operator input.

Abstract: A method for communicating uncompressed HD information includes a transmitter configured to send over wireless channels data-packets and a receiver configured to receive the data-packets from the transmitter. The wireless receiver includes decoders configured to decode the data-packets and an ACK-processor configured to aggregate and send acknowledge signals having an ACK signal for at least one subpacket from the previous packet and ACK signals for all but the at least one subpacket from the current packet. The transmitter may resend a subpacket of the data-packets corresponding to ACK signals in the second status received from the receiver. The new partially delayed ACK mechanism can substantially improve the system throughput for systems with parallel multiple decoders.

Abstract: A system for processing wireless high definition video data to be transmitted in an uncompressed format over a wireless medium is disclosed. In one embodiment, the system includes i) a Reed Solomon (RS) encoder configured to encode a video data stream, ii) a parser configured to parse the RS encoded data stream into a plurality of sub-video data streams, iii) a plurality of convolutional encoders configured to encode in parallel the plurality of sub-video data streams so as to create a plurality of encoded data streams and iv) a multiplexer configured to input the plurality of encoded data streams and output a multiplexed data stream, wherein the multiplexed data stream is transmitted. One embodiment of the invention provides strong error protection for data communications at very high throughput, and makes parallel Viterbi decoding implementation easier at the receiver side.

Abstract: A method of processing high definition video data to be transmitted over a wireless medium is disclosed. In one embodiment, the method includes communicating a data frame having a format of: i) a packet header, ii) a medium access control (MAC) protocol data unit (MPDU) portion, wherein the MPDU portion includes a plurality of transmit data units (TDUs), wherein each TDU includes only uncompressed video data unit, and iii) a plurality of tail bits separately located from the MPDU portion. Another embodiment provides a group parser which allows for efficient convolutional encoding of the WiHD video data. According to at least one embodiment, the system provides the high transmission efficiency of the WiHD video data.

Abstract: A system for processing high definition video data to be transmitted over a wireless medium is disclosed. In one embodiment, the system includes i) a plurality of parallel convolutional encoders configured to encode a plurality of video data streams, respectively, so as to create a plurality of encoded data streams and a multiplexer configured to multiplex the plurality of encoded data streams so as to create a multiplexed data stream, wherein the multiplexed data stream includes a uniform bit pattern which is repeated with a period. According to at least one embodiment, the puncture cycle based multiplexer provides a simple solution for UEP and provides the highest frequency diversity for each data stream.

Abstract: An unequal-error-protection method is disclosed. The method includes performing error-correction coding in parallel; and performing symbol mapping by applying one of a plurality of gains to each of the plurality of error-correction-coded bit streams.

Abstract: A method and system for transmitting video information from a sender to a receiver over a wireless channel, is provided. Video information bits are placed into multiple data packets, and transmitted in a burst sequence from a sender to a receiver over a wireless channel in a first time frame. Transmission of each data packet is separated from transmission of the next data packet by an inter-frame time period which is shortened by a channel switching duration. Then, selected video information bits are retransmitted to from the sender to the receiver in a second time frame.

Abstract: A method and system for transmitting video information from a sender to a receiver over a wireless channel is provided. Video information bits are placed into one or more data packets at the sender, and each data packet is transmitted from the sender to the receiver over a wireless channel during a current time frame. For each transmitted data packet, the sender receives a corresponding acknowledgment packet from the receiver. The sender then performs burst retransmission of the negatively acknowledged packets during a next time frame comprising a BeamTrack Group for transmission of further data packets from the sender to the receiver over a wireless channel. The receiver utilizes each retransmitted data packet to recover a lost or erroneously received data packet.

Abstract: A wireless communication system for transmitting uncompressed video pixels from a transmitter to a receiver over a wireless channel is provided. The transmitter includes an interleaver that interleaves the video pixels into interleaved pixels, and an encoder that convolutionally encodes the interleaved pixels at the transmitter before transmission to the receiver. The receiver includes a decoder that decodes the encoded pixels, and a deinterleaver that deinterleaves the decoded pixels. When the video pixels include pixel errors, such interleaving and deinterleaving reduces pixel error clustering and improves video quality.

Abstract: A method and system of wireless communication is provided which involves inputting information bits, wherein certain bits have higher importance level than other bits, and applying unequal protection to the bits at different importance levels. As such, important bits are provided with more protection for transmission and error recovery. Applying unequal protection involves using skewed constellations such that more important bits are provided with more error recovery protection.

Abstract: A method and system for sounding packet exchange in wireless communication involves generating a training request (TRQ) specifying a number of long training fields (LTFs), and transmitting a TRQ from an initiator (transmit station) having multiple antennas to a responder (receive station) over a wireless channel, wherein the TRQ specifies the number of LTFs based on the number of initiator antennas. The responder then transmits a sounding packet to the initiator, wherein the sounding packet includes multiple LTFs corresponding to the number of LTFs specified in the TRQ. Based on the sounding packet, the initiator transmits a beamforming transmission to the responder to enable wireless data communication therebetween.

Abstract: Techniques are described for multicarrier multiple access wireless transmission, e.g. orthogonal frequency-division multiple access (OFDMA) transmissions, over frequency selective fading channels. The techniques are designed to maintain constant modulus transmissions for uplink while effectively mitigating intersymbol interference. Specifically, the techniques utilize non-redundant unitary precoding across OFDMA subcarriers to maintain constant modulus transmissions for uplink communications. For example, the techniques involve precoding a block of information symbols and assigning a different subcarrier for each symbol of the block. The subcarriers are selected to be equi-spaced and may be selected, for example, from a phase-shift keying constellation. The number of symbols per block is equal to the number of subcarriers assigned per user. Importantly, even with multiple subcarriers per user, the techniques enable constant modulus transmissions for uplink.