Abstract: A communication system 20 uses TDMA techniques to distinguish intended recipients of a communication signal 26 from one another, and direct sequence spread spectrum (DSSS) techniques to encode and distinguish diverse parallel substreams 70 and 74 of each user's data stream. Parallel unspread substreams 70 are spread using cyclic variations of a common spreading code 38. In one embodiment, the common spreading code 38 is chosen for low aperiodic autocorrelation sidelobes and a substantially flat spectral analysis. In another embodiment the common spreading code 38 is chosen for low periodic autocorrelation sidelobes and a substantially flat spectral analysis. In one embodiment, the use of cyclic variations of the spreading code 38 along with a cyclic prefix 114 enables the mathematical communicative matrix multiplication property, thereby permitting equalization for multipath to occur following or in conjunction with despreading.

Abstract: A system and method providing a frame structure to received channel data sent over an air interface of a wireless communication system. The system and method may allow compensation for transmitting and receiving frequency variations, synchronization at the receiver, and provides a virtual signaling channel which may be used for system alarms and status. In one embodiment, the system uses bit stuffing, a frame preamble and a signaling preamble to transmit data at a high data rate in the ISM band.

Abstract: A system and method providing a frame structure to received channel data sent over an air interface of a wireless communication system. The system and method may allow compensation for transmitting and receiving frequency variations, synchronization at the receiver, and provides a virtual signaling channel which may be used for system alarms and status. In one embodiment, the system uses bit stuffing, a frame preamble and a signaling preamble to transmit data at a high data rate in the ISM band.

Abstract: A communication system (20) uses TDMA techniques to distinguish intended recipients of a communication signal (26) from one another, and direct sequence spread spectrum (DSSS) techniques to encode and distinguish diverse parallel substreams (70, 74) of each user's data stream. Parallel unspread substreams (70) are spread using cyclic variations of a common spreading code (38). In one embodiment, the common spreading code (38) is chosen for low aperiodic autocorrelation sidelobes and a substantially flat spectral analysis. In another embodiment the common spreading code (38) is chosen for low periodic autocorrelation sidelobes and a substantially flat spectral analysis. In one embodiment, the use of cyclic variations of the spreading code (38) along with a cyclic prefix (114) enables the mathematical communicative matrix multiplication property, thereby permitting equalization for multipath to occur following or in conjunction with despreading.

Abstract: A high-speed transmitter and receiver are provided. In one embodiment, a transmitter comprises a baseband processor structured to receive data and to convert the data into a multiplicity of high and low signal values, with each high and low signal value having a first timing interval. A local oscillator generates a clock signal at a second timing interval and a digital circuit combines the high and low signal values with the clock signal to produce a transmission signal directly at a transmission frequency. A receiver is configured to receive the signal. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: A forward error correction encoder encodes input data words into code words that comprise a parity matrix. In one aspect, the encoder is optimized based on the properties of the parity matrix in order to reduce routing overhead size.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: An equalizer comprises a hard decision block which feeds an FEC block and a shift register, which uses past estimates during a first iteration. The output of the FEC block is fed back to the shift register during a subsequent iteration to fully remove any inter chip interference.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: A wireless transmitter configured to encode data to be transmitted to a wireless receiver into frames comprising a frame structure. The frame structure comprises a synchronization packet that can be used by the receiver to synchronize with the wireless transmitter followed by data packets interspersed with preamble packets that can be used to re-synchronize the wireless receiver with the wireless transmitter, the length of the data packets selected to ensure that drift in the wireless receiver will be minimal before re-synchronization due to the preamble packets.

Abstract: Apparatus and methods of ultra-wideband (UWB) communication are provided. In one embodiment, an ultra-wideband transmitter includes a processor configured to generate data for transmission in the form of a plurality of ultra-wideband pulses. The transmitter includes a FEC encoder that generates a code word based on the data. The FEC includes a plurality of cyclic shift registers configured to receive and process the data, a plurality of fixed connections between each of the plurality of cyclic shift registers and a plurality of XOR gates communicating with the plurality of fixed connections. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: Apparatus and methods of ultra-wideband (UWB) communication are provided. In one embodiment, an UWB communication system transmits a serial data stream comprising a plurality of ultra-wideband pulses. These UWB pulses are received at a receiver that splits the serial data stream into a plurality of parallel data streams. The phase of at least one of the plurality of parallel data streams is then shifted, and then the plurality of parallel data streams are combined into a combined data stream. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: Systems and methods of ultra-wideband communication are provided. In one ultra-wideband communication system, a portion of a plurality of non-overlapping communication sub-channels are assigned to a first ultra-wideband communication device by a base station. Communication interference information is obtained by the first device, and then transmitted to and received by the base station. The base station then reduces the portion of non-overlapping sub-channels assigned to the first ultra-wideband communication device in response to the interference information, thereby creating a group of available non-overlapping sub-channels, which are assigned to a second ultra-wideband communication device. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein.

Abstract: Apparatus and methods of ultra-wideband communication are provided. In one embodiment, a communication frame is generated and includes a synchronization section, and at least two data sections and at least two preamble sections. An ultra-wideband receiver synchronizes with the ultra-wideband transmitter using the synchronization section, and may also re-synchronize with the transmitter using at least one preamble section. In another embodiment, the length of the data sections are selected to ensure that drift between the ultra-wideband receiver and transmitter will be minimal before re-synchronization. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: Systems and methods of ultra-wideband communication are provided. In one embodiment, an ultra-wideband communication system divides a stream of data conveying symbols into a plurality of unspread substreams. A common spreading code is generated at the ultra-wideband transmitter, and each of the unspread substreams are spread using the common spreading code to form a plurality of spread substreams. The spread substreams are combined to form a composite signal that is transmitted. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: Apparatus and methods of ultra-wideband (UWB) communication are provided. In one embodiment, an ultra-wideband receiver receives a serial data stream comprising a plurality of ultra-wideband pulses. A serial to parallel converter then converts the serial data stream into a plurality of parallel data streams, which are then matched. A combiner then combines the data streams, which are then fed to an equalizer that includes a hard decision element, a past decision element and a future decision element. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.