Lucent Technologies Inc.

At+t Corp.

At&t Bell Laboratories

At&t Intellectual Property I, L.p.

Lawrence Joel Greenstein

Thomas M Willis, Iii

Thomas Edward Darcie

Martin Clark

Carol Catalano Martin

Peter Frank Driessen

Vinko Erceg

Giovanni Vannucci

Nelson Ray Sollenberger

Krishan Kumar Sabnani

Bernard Glance

Sirikiat Lek Ariyavisitakul

Yu S Yeh

Noach Amitay

Ta-Shing Chu

Robert S Roman

Martin V Clark

Anthony Joseph Rustako, Jr

Robert Stephen Roman

Anthony Joseph Rustako

Multiple-input/multiple-output (MIMO) antenna technology is used in a point-to-point radio link to provide higher data rates than would otherwise be achievable in a similar system that did not use MIMO antenna technology. Particular embodiments of the invention implement channel coding, dual polarization, adaptive receiver combining and adaptive power control.

High-speed two-way point-to-point transmission

A system and method for statistically modeling the operation of a directional terminal antenna in a wireless link. When using a directional terminal antenna, received power may be enhanced by as much as the antenna gain. In local scattering, however, the enhancement will be smaller. The system and method model this decrement, known as the gain reduction factor, &Dgr;, for fixed suburban paths, based on angle-of-arrival measurements. The system and method also provide the capability to statistically model the transmission performance of a directional terminal antenna in a wireless link while analyzing influences of antenna height, antenna beamwidth, distance and season.

Method and system for determining gain reductions due to scatter on wireless paths with directional antennas

A system provides transmit diversity with feedback to enhance the reception of communication signals at a wireless communication terminal. Multiple antennae are provided at the base station. The multiple antennae transmit multi-carrier information signals such as OFDM including pilot tones. The wireless communication terminal receives the pilot tones and performs processing on those tones to detect the relationship between the information signals transmitted from the various antennae of the base station. A feedback signal, based on the comparison of the pilot tones communicates back to the base station information about the channels of the respective transmit antennae to the terminals. The base station modifies the transmission processing associated with the various transmit antennae based upon the feedback signal. The modified processing improves the reception of the information signals at the wireless communication terminal.

Method and apparatus for enhancing communication reception at a wireless

A wireless communications system includes a number of clusters of repeaters wherein all repeaters within a cluster arc connected to a common hub via respective millimeter-wave radio links. Wireless signals received by the repeaters from end-user devices are transparently carried by the millimeter-wave radio links to respective hubs that act as concentrators for the repeaters. The hubs may be linked to a wireless network base station (in an outdoor setting) or alternatively to a server or a PBX (in an indoor environment) via a high-speed transmission facility, such as a fiber optic cable that is thus shared by all the repeaters.

Method and system for connecting cells and microcells in a wireless

Average local traffic load in a simulcast radio system is estimated to achieve efficient resource sharing and dynamic reconfiguration of the simulcast areas. A method for estimating the average local traffic load uses relative power measurements at each radio port (or distributed antenna element). The estimating method is applicable to both code-division multiple access (CDMA) and time-division multiple access (TDMA) systems. The method provides accurate estimates of the actual radio port traffic over various system conditions, while requiring only an approximate knowledge of the radio propagation environment.

Estimating PCS traffic from radio port measurements

A telephone or two-way digital paging communication system providing an alternative partial communication format in which an acknowledgement signal is transmitted from a telephone device in response to a received voice or data signal. The communication system is switchable between different types of communication formats including full two-way voice or data service, partial two-way service and one-way pager service. The communication system may be implemented in a cellular network in which a portable cellular telephone is adapted to transmit signals at different transmission rates so as to increase its operable range.

Integrated communication system

A canceller for eliminating the cross-polarization interference in incoming signals having polarizations which are orthogonal to one another is proposed. Each incoming signal is coupled to an associated adaptive filter. Each filter output is then summed with an associated one of the incoming signals which has a polarization orthogonal to that of the filter input signal. The signal sums formed are the canceller output signals. Adjustment of the adaptive filters so as to cancel the cross-polarization interference in each received signal is made in response to the incoming signals and the canceller output signals at selected times. During these times, circuitry for adjusting the adaptive filters examines spectral tones formed by the incoming signals and the canceller output signals.

Cross-polarization interference cancellation

The present invention relates to a space diversity combiner which includes two branches wherein separate multipath signals received from a remote source are propagated. The branch signals are combined and the combiner output signal is used for obtaining noncoherent spectrum measurements which are in turn used to account for both dispersion and noise in controlling the relative amplitudes and phases of the two branch signals to provide a maximum performance measure for the combiner.

Technique for digital radio space diversity combining

The present invention relates to a time-division radio transmission technique which uses a modified full-duplex arrangement where two channels are assigned to each two-way link. Simultaneous two-way transmission includes sequential digital symbol bursts between two remote transceivers which alternate between a first and a second channel centered on a first and a second radio frequency, respectively, with each transceiver using a different one of the channels at any instant of time.

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Edison, NJ, United States of America

Lawrence Joel Greenstein