Abstract: A first time division multiplex (TDM) time slot is provided which is defined as a bi-directional channel for use in a TDM network including a source node and a destination node. The source node can transmit data to the destination node in a first portion of a first TDM time slot. In one implementation, a second portion of the same first TDM time slot can be reserved for the destination node to transmit information to the source node. For example, the destination node can determine whether the data from the source node has arrived properly, and then transmit an indication message to the source node in the second portion of the same first TDM time slot to indicate whether the data from the source node has arrived properly at the destination node.

Abstract: Techniques are provided for reliably distributing network management information in and ad hoc multi-hop wireless network which includes a number of existing nodes. A first node selects a particular timeslot in a dedicated channel based on the network management information received from the neighbor nodes and determines, via a contention channel, if the particular timeslot is being used by any neighbor nodes of the first node. If the particular timeslot is determined to be unused, then it is assigned to the first node for periodically transmitting network management information.

Abstract: Techniques are provided for communicating a data stream in a wireless communication network. A source divides the data stream into a first data sub-stream and a second data sub-stream. The first data sub-stream can be modulated using a first modulation technique to generate a first modulated data sub-stream, and the second data sub-stream can be modulated using a second modulation technique to generate a second modulated data sub-stream. A destination receives the first data sub-stream over a first frequency band, and receives the second data sub-stream over a second frequency band. The destination demodulates the first data sub-stream using a first demodulation technique to generate a first demodulated data sub-stream, and demodulates the second data sub-stream using a second demodulation technique to generate a second demodulated data sub-stream. The destination then combines the first demodulated data sub-stream and the second demodulated data sub-stream to generate the data stream.

Abstract: A wireless communication device (e.g., 102) employs a method and apparatus for determining distances between wireless communications devices in a wireless communication network (100). The wireless device receives an incoming message signal (117) from at least one other wireless device (e.g., 101, 103-104) in the network. The message signal(s) includes a time of arrival of a ranging signal (121) previously transmitted by the wireless device. Responsive to receiving the message signal(s), the wireless device receives one or more incoming ranging signal(s) (120) from the other wireless device(s). Each ranging signal is received in a frequency range that is substantially less than the frequency range in which the messaging signal(s) was received.

Abstract: A system and method for routing packets in a multihopping wireless communication network (100). The system and method selects a node (106-1) of the wireless network (100) to operate as an aggregation point, at which two or more possible routes for transmitting packets or packet fragments from a source mobile node (102-1) to a destination mobile node (102-2) meet. A primary route is selected based on historical quality of one or more links between nodes (102, 106, 107), and one or more secondary routes are selected based on the success rate of packets reaching the aggregation point.

Abstract: A system and method for cognitive communication device operation. In accordance with the system and method, a node (102, 106, 107) that communicates in a wireless multihopping communication network (100) uses a receiver (302, 402, 502, 602) to acquire a digital sample of a communication signal, and extracts at least one feature of the digital sample. The node (102, 106, 107) employs a classifier (306, 406, 506) to determine the signal type, and a transmitter (108) to send feature vectors including information representing the signal type to other nodes (102, 106, 107) in the network (100).

Abstract: A system and method for supplementing voice transmissions between at least two devices (300) in a wireless network (100), in particular, a wireless multihopping network, with user information pertaining to a transmitting user. The system and method employ a device (300) capable of sending and receiving voice transmissions, which is programmable with user information that defines a user of the device (300), such that the device (300) combines voice transmissions from the device (300) with the programmed user information into a transmission for receipt by other devices (300) in the network (300).

Abstract: The invention relates to a method of performing channel simulation and a channel simulator. The channel simulation is performed digitally. At least a section of a signal (206) to be fed to simulation is transformed by convolution transformation from time space to transformation space in tansformation means (200) of the channel simulator. In weighting means (202), the transformed signal (208) is weighted by a channel impulse response that is transformed from time space to transformation space. Finally, the resulting signal (210) is inverse-transformed in inverse-transformation means (204) to time space.

Abstract: A system and method for achieving crest factor (CF) reduction for multi-carrier modulation in a wireless communication network (100), such as an ad-hoc peer-to-peer multi-hopping mobile wireless communication network (100). The system and method use the properties of the Inverse Fourier Transform (TFT) for achieving crest-factor reduction. Specifically, the system and method map original signal input frequencies to a new set of frequencies by mapping every input frequency to some other input frequency, and then using the IFT to create multiple versions of the transmitted signal and then computing the transform with the lowest CF and selecting that signal for transmission.

Abstract: A system and method for transmitting packets in a network (100). A node (102, 106, 107) in the network (100) accesses uses one of a plurality of medium access techniques for transmitting packets on the network (100). The node (102, 106, 107) separates packets to be transmitted into classes based on at least one characteristic of the packets and selects one of the medium access techniques for each class of packets based on whether the medium access technique provides improved transmission efficiency for the at least one characteristic of the packets in the class. The node (102, 106, 107) transmits the packets in each respective class using the respective selected medium access technique.

Abstract: A system and method for controlling the quantity of training symbols in a transmission sequence sent by a terminal (102, 106, 107) in a wireless network (100). The transmission sequence include training symbols and data symbols. The system and method determine the number of data symbol errors which are close to training symbols in the transmission sequence, determine the number of symbol data errors which are far from training symbols in the transmission sequence, and adjust the quantity of training symbols in the transmission sequence based on a result of a comparison of the ratio of the number of data symbol errors which are close to training symbols to the number of data symbol errors which are far from training symbols.

Abstract: An intelligent transportation system and method employing ad-hoc multihopping wireless network technology. The system and method are capable of communicating travel condition information between vehicles (200), and employ a plurality of nodes (250), each adapted for communication in the multihopping network (100), and each being further adapted for deployment on a vehicle (200). Each of the nodes (250) operates to receive respective travel condition information pertaining to travel conditions relating to its respective vehicle (200), and transmits the respective travel information for receipt by other nodes (250).

Abstract: A technique for allowing a first and second group of users to share access to a communication channel such as a radio channel. A first group of users is typically a legacy group of users such as those using digital CDMA cellular telephone equipment. The second group of users are a group of data users that code their transmissions in different formats optimized for data functionalities. The first group of users share one modulation structure such as, on a reverse link, using unique phase offsets of a common pseudorandom noise (PN) code. The second group of users share another modulation structure but in a manner that is consistent and compatible with the users of the first group. Specifically, the users of the second group may all use the same PN code and code phase offset. However, they are uniquely identified such as, for example, assigning each of them a unique orthogonal code.

Abstract: A system and method for creating a spectrum agile wireless multi-hopping network, such as a wireless ad-hoc peer-to-peer multi-hopping network. The spectrum agile multi-hopping network that can respond to conditions affecting spectrum, such as FCC rulings or business related agreements on spectrum licensing related to a location or other measurable parameters of the network.

Abstract: A system and method for enabling the coexistence of waveforms that do not comply with IEEE Standard 802.11 in the presence of 802.11 compliant waveforms in a wireless communication network (100), in particular, a wireless multi-hopping ad-hoc peer-to-peer communication network (100). More particularly, the system and method controls 802.11 compliant devices (102, 106, 106) in the communication network to refrain from accessing a transmission medium for a predetermined time so that communication not complying with 802.11 can be performed, such as transmission of signals between devices (102, 106, 107) to perform time-of-flight measurements.

Abstract: The present invention provides a bandwidth efficient system and method of measuring the range between nodes (102, 106, 107) in a wireless communications network (100) with one-way data transfer, where each node (102, 106, 107) periodically transmits a message that contains information regarding neighboring nodes (102, 106, 107) from which any prior messages have been received by the transmitting node (102, 106, 107). A node (102, 106, 107) receives the messages transmitted from neighboring nodes (102, 106, 107) in the network (100), and records the times of arrival of the received messages. The node (102, 106, 107) receiving those messages can thus determine the respective distances between itself and the neighboring nodes (102, 106, 107) based on the respective time of arrivals of the received messages and the respective information included in the respective messages.

Abstract: A system and method for providing position information of mobile user terminals (103) in a portable voice and data wireless communications network, such as an ad-hoc wireless communications network (100). More particularly, the present invention relates to a system of locating persons or assets using a centralized computing device, such as a server (125), that computes the respective locations of the terminals (103) from the respective information provided by the terminals (103) relating to their respective locations. A graphical display (121) that retrieves the location information from the centralized server (125) and generates a graphical display (121) of the location of all or selected terminals (103) based on their locations as computed by the server (125).

Abstract: A technique for allowing a first and second group of users to share access to a communication channel such as a wireless radio channel is disclosed. The first group of users can be a group of legacy users such as those that use digital CDMA cellular telephone equipment based on the IS-95 standard. The second group of users can be a group of web surfers that code their transmissions using one of multiple formats. The first group of users can share one modulation structure such as, on a reverse link, using unique phase offsets of a common pseudorandom noise (PN) code. The second group of users can share another modulation structure, but in a manner that is consistent and compatible with the users of the first group. Specifically, the users of the second group may all use the same PN code and code phase offset. Each channel used by the second group of users can be uniquely identified by a corresponding unique orthogonal code.

Abstract: A technique for distributing channel allocation information in a demand access communication system. In a preferred embodiment, for use with Code Division Multiple Access (CDMA) type communication, multiple access codes are used that have a defined code repeat period or code epoch. For each such epoch duration, a central controller, such as located at a base station in the case of operating a forward link, determines a schedule of assignment of traffic channels to active terminals for each epoch. For each terminal designated as active during the epoch, an active terminal unit identifier is assigned. For each terminal designated as active during the epoch, the base station assigns a list of active channels for such terminal unit. Prior to the start of each epoch, a channel set up message is sent on one of the forward link channels, such as a paging channel.

Abstract: The invention relates to a method of performing channel simulation and a channel simulator. The channel simulation is performed digitally. At least a section of a signal (206) to be fed to simulation is transformed by convolution transformation from time space to transformation space in tansformation means (200) of the channel simulator. In weighting means (202), the transformed signal (208) is weighted by a channel impulse response that is transformed from time space to transformation space. Finally, the resulting signal (210) is inverse-transformed in inverse-transformation means (204) to time space.