Abstract: A temperature sensing system including a head unit comprising a thermal sensor for acquiring thermal data from a surface, a wireless transmitter wirelessly transmitting the thermal data, and a mounting interface; and a non-conductive pole connected to the mounting interface of the head unit.

Abstract: A temperature sensing system including a head unit comprising a thermal sensor for acquiring thermal data from a surface, a wireless transmitter wirelessly transmitting the thermal data, and a mounting interface; and a non-conductive pole connected to the mounting interface of the head unit.

Abstract: A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between user data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between the different user data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

Abstract: A family of methods for interference averaging in multicarrier systems, such as orthogonal frequency division multiplexing (OFDM) systems. The methods can provide interference averaging in situations where an interfering co-channel is either partially or fully loaded. For partially loaded systems, subcarrier puncturing, frequency domain repetition, time domain repetition, and hybrid time-frequency repetition schemes are provided. For systems using adaptive modulation/coding rates, lower rates and transmit power can be selected in order to perform interference averaging in time-spread and frequency-spread OFDM schemes. In systems with downlink power control, frequency domain mixing can be used to perform interference averaging.

Abstract: A method and system for adaptive control of sub-carriers is useful for increasing frequency diversity gain to improve bit error rate performance in an Interleaved Frequency Division Multiple Access (IFDMA) system. The method includes selecting a combination of a Repetition Factor (RF) and a repetition block size (Q), from possible combinations of a RF and a Q, based on a number of users (Nu) (step 1405). A Spreading Factor (SF), Forward Error Correction (FEC) coding rate (R), or modulation order (M) based on the Nu is then determined (step 1410). Control signals are then provided based on the RF and Q, and based on the SF, R, or M (step 1415).

Abstract: A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

Abstract: A timing recovery scheme demarcates a complete range of inter-symbol interference free (ISI-free) sampling positions available in a cyclically extended symbol. The timing recovery scheme computes an ensemble correlation between the cyclic extension and the data part of symbols to estimate timing. The ensemble correlation function retains delay-spread and timing information by separately maintaining the correlation value for each sample position within the symbol duration and combines the correlation values for identical sample positions over an ensemble of symbols. In this manner, the scheme not only provides timing estimates, but can also provide estimates of the multipath delay-spread in a channel. The delay-spread estimates provide valuable information about the nature of the channel. A receiver can use this information, for example, to adjust the frequency-domain channel interpolation filter bandwidth in order to improve performance for the given channel condition.

Abstract: A method and system (102) provide adaptive modulation/coding with distribution of excess resources based on one or more system criteria. The system (102) may be any system with more than one modulation rate or more than one coding rate and may be a wireless communication system using CDMA, TDMA, OFDM or any other signal formats. Generally, the method determines excess resources of the system based on desired characteristics of links supported by the system. The excess resources may be any number of system resources, such as transmit power. These excess resources are then distributed to the links based on various system criteria, such as to increase system coverage, to increase system capacity, to modify a data rate profile of the system or to reduce interference in the system. Methods for providing such distribution of the excess resources are also provided for equal data rate systems.

Abstract: The present invention provides a method of operation for a variable transmission mode multi-carrier communication system by receiving a signal, determining a link quality as a function of the received signal, and selecting a compound multi-carrier communication mode as a function of the link quality.

Abstract: In accordance with the preferred embodiment of the present invention, excess power is distributed to certain streams in order to increase the stream's signal quality, and thus, its encoding rate. Although certain streams will have their overall power, and thus their signal quality reduced, in the preferred embodiment of the present invention the reduction in signal quality is limited so that the encoding rate for these streams remains unchanged.

Abstract: In accordance with the preferred embodiment of the present invention, excess power is distributed to certain streams in order to increase the stream's signal quality, and thus, its encoding rate. Although certain streams will have their overall power, and thus their signal quality reduced, in the preferred embodiment of the present invention the reduction in signal quality is limited so that the encoding rate for these streams remains unchanged.

Abstract: The present invention provides a method of operation for a variable transmission mode multi-carrier communication system by receiving a signal, determining a link quality as a function of the received signal, and selecting a compound multi-carrier communication mode as a function of the link quality.

Abstract: A timing recovery scheme demarcates a complete range of inter-symbol interference free (ISI-free) sampling positions available in a cyclically extended symbol. The timing recovery scheme computes an ensemble correlation between the cyclic extension and the data part of symbols to estimate timing. The ensemble correlation function retains delay-spread and timing information by separately maintaining the correlation value for each sample position within the symbol duration and combines the correlation values for identical sample positions over an ensemble of symbols. In this manner, the scheme not only provides timing estimates, but can also provide estimates of the multipath delay-spread in a channel. The delay-spread estimates provide valuable information about the nature of the channel. A receiver can use this information, for example, to adjust the frequency-domain channel interpolation filter bandwidth in order to improve performance for the given channel condition.

Abstract: A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

Abstract: A method and system (102) for providing criterion based adaptive power allocation with selective determination of modulation and coding is provided. A method is presented which consists of providing adaptive power allocation with a target signal quality for each link based on a system criterion, and a modulation/coding rate for each link based on a signal quality associated with the transmit power of each link. A further method is provided which may alternatively, or additionally, consist of APA in which the transmit power for each link is assigned in an attempt to obtain a signal quality for each link within a range between or equal to a minimum and maximum. An additional method is disclosed consisting of APA in which the transmit power for each link is assigned in an attempt to obtain a signal quality for each link as close as possible to a common signal quality, when the power allocation method has a limited dynamic range.

Abstract: A system and method for calculating survivor metrics in a Viterbi equalizer of a receiver, such as a receiver operative to receive a PSK-modulated signal, for example, a .pi./4, differential, phase-shift-keying, modulated signal. The state transition metric, defined as a function of two successive states, is converted into a function defined by pairwise differences between allowable symbols of a PSK-modulated signal. When operative to receive the .pi./4 DQPSK-modulated signal, the number of calculations required to calculate state transition metrics is reduced significantly.

Abstract: A method (300), system (400), base station (500), head-end unit (600), and subscriber unit (700) provide for efficient resource management in a communication system or group of communication systems supporting a plurality of communication units, where different communication units may have varying resource size requirements. The method includes the steps of: determining a resource size requirement of a communication unit of the plurality of communication units, determining a hierarchical level within the hierarchy that the communication unit is to be assigned to based on the resource size requirement of the communication unit, and assigning the communication unit to an available resource slot in the hierarchical level in accordance with a predetermined hierarchical management scheme that maximizes a total number of remaining available slots in the hierarchy.

Abstract: A method (300), system (400), base station (500), head-end unit (600), and subscriber unit (700) provide for efficient resource hopping in a communication system or group of communication systems supporting a plurality of communication units, where different communication units may have varying resource size requirements. The method includes the steps of: assigning a communication unit of the plurality of communication units to a resource slot within a level of a plurality of levels of a hierarchical representation of a resource region, assigning an available resource hopping pattern and associated initial resource location within the resource slot to the communication unit, and hopping, by the communication unit in accordance with a predetermined hierarchical resource hopping scheme.

Abstract: The present invention provides a method, device, base station and subscriber unit for combining a plurality of antenna output signals to provide a combined data signal in a communication system where the antennas receive at least one user signal and where the at least one user signal contains pilot symbols and data symbols. The method includes the steps of: forming, in at least one communications receiver, a plurality of weighted antenna output signals, one for each antenna of a plurality of antennas, based on at least two covariance matrices and at least two steering vectors determined from the pilot symbols; and combining the weighted antenna output signals from the plurality of antennas to form the combined data signal.

Abstract: A synchronous coherent orthogonal frequency division multiplexing, SC-OFDM, system, method, software and device include a plurality of SC-OFDM transmitters and a plurality of SC-OFDM receivers. Each of the plurality of SC-OFDM transmitters is synchronized to a reference where the reference is derived from a common source, for transmitting SC-OFDM signals. The plurality of SC-OFDM receivers is arranged to receive the SC-OFDM signals from at least one of the plurality of SC-OFDM transmitters. The SC-OFDM signals each have a cyclic extension, and the SC-OFDM signals from each SC-OFDM transmitter include at least one pilot code in accordance with a predetermined pilot code scheme.