Harris Corporation

Conexant Systems, Inc.

Intellectual Ventures I LLC

Conexant, Inc.

Xocyst Transfer Ag L.l.c.

Intersil Americas Inc.

Steven D Halford

Mark A Webster

Richard D Roberts

Shawn H Gallagher

Eric J Salyers

Gayle Patrick Martin

Daniel D Shearer, Iii

Perry W Frogge

Alex C Yeh

Albert L Garrett

John C Henry, Iii

Michael J Seals

George R Nelson

Matthew D Collins

A managed access system for mobile wireless devices (MWDs) in a facility that is geographically within a wireless communications network of a communications carrier includes a plurality of antennas arranged at the facility, radio equipment coupled to the plurality of antennas, and a network interface device configured to provide communications with the communications carrier. A management access controller is configured to communicate with MWDs via the radio equipment, compare an identification of a given MWD to a list of authorized MWD's to determine whether the given MWD is unauthorized or authorized, and filter communications between an unauthorized MWD and the network interface device and pass communications between an authorized MWD and the network interface device.

Managed access system having filtered communications using network interface device

A managed access system for mobile wireless devices (MWDs) in a facility that is geographically within a wireless communications network includes a plurality of antennas arranged at the facility and at least one MWD monitoring device. Radio equipment is coupled to the antennas. A management access controller cooperates with the radio equipment to communicate with a given MWD within the facility, block outside communications via the wireless communications network when the given MWD is an unauthorized MWD, and provide outside communications when the given MWD is an authorized MWD. The management access controller cooperates with at least one MWD monitoring device to determine whether the radio equipment and at least one MWD monitoring device both detect the given MWD.

Managed access system with monitoring device to determine system operability

Methods, systems, and apparatuses, including computer programs encoded on computer-readable media, for determining if a super short mode is enabled. Transmitting a first packet that includes a synchronization pattern, and a payload if the super short mode is enabled, and transmitting a second packet that includes a preamble, a header, the synchronization pattern and the payload if the super short mode is not enabled.

Dual packet configuration for wireless communications

A dual packet configuration for wireless communications including a first portion that is modulated according to a serial modulation and a second portion that is modulated according to a parallel modulation. The serial modulation may be DSSS whereas the parallel modulation may be OFDM. The first portion may include a header, which may further include an OFDM mode bit and a length field indicating the duration the second portion. The first portion may be in accordance with 802.11b to enable dual mode devices to coexist and communicate in the same area as standard 802.11b devices. The dual mode devices can communicate at different or higher data rates without interruption from the 802.11b devices. The packet configuration may include an OFDM signal symbol which further includes a data rate section and a data count section. In this manner, data rates the same as or similar to the 802.11a data rates may be specified between dual mode devices. The first and second portions may be based on the same or different clock fundamentals. For OFDM, the number of subcarriers, pilot tones and guard interval samples may be modified independently or in combination to achieve various embodiments. Also, data subcarriers may be discarded and replaced with pilot tones for transmission. The receiver regenerates the discarded data based on received data, such as using ECC techniques.

A power-based hardware antenna diversity method for a wireless transceiver with multiple antennas is disclosed. The method is characterized in the steps of setting the transceiver gain at a maximum level to establish a first story of dynamic power range above a noise floor level, using a high-resolution ADC at a large back-off level relative to the noise floor to detect weak signals within the first story of the dynamic power range, switching antennas and measuring power level for each antenna during signal onset, and selecting an antenna having a largest power level.

Power-based hardware diversity

A wireless receiver that sorts packets including a packet detector, multiple correlators, and multiple packet processors. Each correlator correlates a received signal according to packet type. Each packet processor processes the received signal according to packet type. A signal power detector may be provided to initially qualify the received signal as containing a packet, and the correlators determine whether a packet is present. The correlators may be configured for sequential or simultaneous correlation. For the simultaneous correlator configuration, a correlation monitor is provided to monitor correlation results to determine if the received signal contains a packet, and if so, to determine packet type. A low SNR packet detector may be provided which correlates the received signal to detect weak packet signals. The signal power detector may be omitted, where the correlators simultaneously monitor the received signal while a correlation monitor continuously monitors correlation results for packet detection.

Wireless receiver for sorting packets

An adaptive frequency equalization system providing an equalizer that has programmable taps that adjusts magnitude and phase of symbol information of a received signal and that provides equalized symbol information. The system includes a hard decision circuit that selects ideal symbol values using the equalized symbol information. A frequency response circuit determines frequency response update values using the ideal symbol values and the received signal. An adjust circuit updates stored frequency response information using the frequency response update values, and also updates the programmable taps of the equalizer using the stored frequency response information.

Adaptive frequency equalizer

A 10 MHz channelized orthogonal frequency division multiplexing (OFDM) transmitter is provided that communicates using a modified OFDM packet structure with a half-rate oscillator having standard accuracy. The transmitter has an inverse fast fourier transform (IFFT) data processor that appends an outer pair of data subcarriers on either end of an OFDM subcarrier profile. An IFFT long sync processor appends an outer pair of binary phase shift key (BPSK) subcarriers on either end of an OFDM long sync subcarrier profile. By copying or appending the information of the data subcarriers closest to zero Hz. to more robust locations, 10 MHz channelized OFDM can be achieved with half-rate clocks and 20 PPM oscillators.

Modified OFDM subcarrier profile

A signal separator overcomes co-linear interference encountered in a wireless communication system base station by exploiting generally flat fading multipath characteristics of incoming signals. For this purpose, the invention employs diversity gained through the use of antenna array elements having different polarizations. An RF downconverter provides a signal separator with baseband, discrete-time digital samples of signal waveforms, received at one or more pairs of diverse polarization antenna elements. The signal separator weights and combines the baseband signals from the vertically and horizontally polarized received signals produced by the RF downconverter to estimate which signals emanate from which users. The signal separator uses polarization coefficients supplied by a coefficient calculator. To generate the polarization coefficients, the coefficient calculator is coupled to receive a set of channel fading coefficients from a channel estimator. Estimates of the channel fading coefficients may be derived using standard signal processing algorithms using the peak values and the known cross-correlation between training patterns. The coefficient calculator computes the polarization coefficients required by the signal separator by means of a coefficient matrix such that the output of the signal separator is equal to the user's information signal.

Linear signal separation using polarization diversity

The performance of a RAKE receiver for indoor multipath WLAN applications on direct sequence spread spectrum signals having relatively short codeword lengths comprises a channel-matched filter and codeword correlator front end, plus a signal combiner to which the codeword correlation component is applied. The signal combiner is supplied with a bias-corrected input calculated by a distorted codeword signature (power) generator, which is operative to generate and store a set of N codeword power correction values. The signal combiner combines correction values into the codeword correlation for each potentially transmitted codeword S . This serves to correct each correlation codeword metric by a de-biasing power component &verbar;S &verbar; for the unequal multipath-based distortions of the codeword energies. The output of the signal combiner is coupled to a peak detector, which selects a minimum distance-based 'de-biased' output as the transmitted codeword.

Biased-corrected rake receiver for direct sequence spread spectrum waveform

A method and apparatus for detecting and decoding multiple or single users in a TDMA system where multipath propagation is present. A TDMA receiver may receive a one dimensional TDMA signal stream and may include a maximum likelihood sequence estimation (MLSE) stage to detect users from the received one dimensional TDMA signal stream. A decision feedback equalizer receives the postcursor portions of the TDMA channel from a channel estimator and an estimate of the postcursor portions of the transmitted signal from the MLSE stage. The decision feedback equalizer (DFE) truncates the interference in the received TDMA signal stream by cancelling the postcursor portion of the channel. The MLSE stage operates on the truncated TDMA signal stream to detect users.

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Palm Bay, FL, United States of America

Steven D Halford