46 results about "Receiver diversity" patented technology

A token-based receiver diversity processing is described. In one embodiment, a receiver diversity comprises repeaters receiving wirelessly transmitted packets from a mobile station, and one of the repeaters forwarding packets of the wirelessly transmitted packets to a switch if the one repeater is currently assigned to forward packets from the mobile station based on an indicator assigned prior to the wirelessly transmitted packets being sent.

Wireless receivers are described for receiving signals from a transmitter. A receiver can include a plurality of antennas each for receiving a version of a signal via a different propagation channel and providing that version to a respective input. Signal processing means can be included and configured to operate diversity processing of a supplied number of said inputs for use in performing detection of said signal. The receiver can include channel parameter estimation means, configured to estimate one or more channel parameters on the propagation channels. The receiver can also include selection means configured to select only a subset of said inputs to implement a specific dimensionality of the receiver diversity processing, in dependence on the one or more channel parameters indicative of channel conditions on said propagation channels. The diversity processing can be linear or non-linear. Related methods and software implementations and computer program products are also described.

The present invention provides a narrowband OFDM (NOFDM) system with frequency diversity redundant transmission and receiver diversity selection and combining scheme. The communication channel is segmented into independent plurality of sub-channels. The sub-channels can be used in an aggregated mode to transmit different data on every sub-channel or in a number of redundant modes, where the same data is sent on multiple sub-channels to achieve maximum robustness of communication. Redundant modes may include channel selection diversity and/or weighted channel combining diversity.

Control of receiver antenna diversity is described in relation to apparatuses, user radio terminals, a method, and a computer program. The apparatus comprises an interface configured to obtain information on a power control procedure of a radio receiver and a processing unit configured to switch on/off a receiver antenna diversity branch of the radio receiver on the basis of a comparison between a predetermined condition and the information on the power control procedure.

Receiver diversity in a wireless device is controlled in response to operating conditions, transmission requirements, and control settings. The control of diversity reduces power consumption by enabling receive diversity on given conditions. Operating conditions, transmission requirements, and control settings are used separately or used in conjunction to determine whether benefits of multi-antenna receive diversity, such as higher link capacity, higher data throughput, lower transmit power, and lower error rate, warrant the higher power cost of the diversity.

Methods and apparatus for adaptively adjusting receiver operation for e.g., power optimization. In one embodiment, operation during diversity operation is adaptively adjusted. Diversity techniques consume significantly more power than non-diversity operation. However, the performance gain from receiver diversity is not always predictable. Consequently, in one embodiment, a device evaluates the overall performance gain contributed by diversity operation and, where the performance gain is insignificant or inadequate, the device disables diversity operation. In one implementation, the device can operate in a static single antenna mode, a dynamic single antenna mode and a dynamic multi-antenna mode.

Methods and arrangements for providing load reference data in a CDMA wireless communication system with receiver diversity are presented. The method comprises measuring (210) of received total wideband power for more than one receiver branch. Probability distributions for a respective power quantity are estimated (212), related to selected state variables of an estimation algorithm, from quantities representing the measured powers using selected measurement functions of the selected state variables of the estimation algorithm. The selected state variables correspond to cell power quantities and the selected measurement functions correspond to the quantities representing the measured powers. A conditional probability distribution of noise floor measures for the respective branches are computed (214) based on the estimated probability distributions. The method ends with provision (216) of load reference data based on the computed conditional probability distributions of the noise floor measures.

Wireless communication devices with multiple receive (RX) chains may be operated to maintain high performance while saving power. This may be accomplished by evaluating signal strength during transmission of the RX packets, and/or evaluating a possible imbalance (gain difference) between the multiple RX chains within the wireless communication device. Signal strength (or good signal) detection may be enabled when non-MIMO (non-multiple-in-multiple-out) transmissions are taking place, while imbalance detection (antenna gain comparison) may be enabled when a specified number of single-stream packets have been received. Once the decision has been made to operate in a reduced number RX path mode, decision to reactivate one or more additional RX paths may be made based on MIMO detection, a detection of a drop in signal quality, and/or upon expiration of a power save timer.

Wireless communication devices (UEs) may include multiple receive (RX) chains and associated antennas, and at least one transmit (TX) chain co-located with one of the RX chains. The UE may track instant fading of the antenna gain(s) during reception of packets from an associated access point (AP) device to which the UE intends to transmit packets. The UE may also track long term antenna gain(s), using any packets received at the multiple RX chains within the UE. At a switching occasion, a decision is made by the UE whether to switch antennas. If the instant fading detection is based on packets received no later than a specified time period prior to the switching occasion, then the UE may make the switching decision based on the results of the instant fading tracking. Otherwise, the UE may make the switching decision based on the results of the long term antenna gain tracking. The wireless communication devices may also evaluate signal strength during transmission of the RX packets, and/or may evaluate a possible imbalance (gain difference) between the multiple RX chains within the wireless communication device. Signal strength detection may be enabled when non-MIMO transmissions are taking place, while imbalance detection (antenna gain comparison) may be enabled when a specified number of single-stream packets have been received. Once the decision has been made to operate in a reduced number RX path mode, decision to reactivate one or more additional RX paths may be made based on MIMO detection, a detection of a drop in signal quality, and/or upon expiration of a power save timer.

The invention relates to a method for realizing wireless microphone receiver diversity by utilizing noise and diversity system. The method includes that a receiving unit circuit processes a radio frequency signal and then outputs a demodulating signal to a single-pole double-throw switch, the receiving unit circuit also outputs a field intensity signal, and the field intensity signal is input to the two ends of a field intensity comparer by virtue of a low pass filter; a high pass filter filters low frequency component from the demodulating signal and remains high frequency noise component, a direct current voltage in direct proportion with the intensity and amplitude of the high frequency noise component is output by virtue of a noise detector, the direct current voltage controls the opening and close of a single-pole single-throw switch, when the intensity of one radio frequency signal rapidly falls and the direct current exceeds the preset threshold value, the single-pole single-throw switch is grounded, and the single-pole double-throw switch is switched to another demodulating signal. The invention can eliminate action lag caused by field intensity diversity circuit and burst noise produced in rapid falling of radio frequency signal intensity.

The receiver diversity-receives radio wave with a plurality of antennas. The receiver includes a conductive case having a receiving section for executing diversity-receiving processing, a first through hole and a second through hole that are disposed on the surface of the same side of the case and penetrate the case from the outside to the inside, a first antenna and a second antenna for supplying a received signal to the receiving section, and a first hinge and a second hinge that are fixed to the inside of the case, pass the first through hole and the second through hole, directly or indirectly support the first antenna and the second antenna, and are movable, respectively. A partition is disposed between the first through hole and the second through hole.

The present invention relates to antenna arrangement for a portable device, wherein the antenna arrangement comprises a main radiating element (1) and a diversity radiating element (2). The main radiating element (1) is configured to be tuned (4) to part of a receiving frequency band of said antenna arrangement, and the diversity radiating element (2) is configured to be tuned (5) to another part of the receiving frequency band.

The invention discloses a high-speed uplink packet access scheduling method based on an unbalance double-antenna, which includes the procedures as follows: A1. a base station is judged if the receiver diversity exists, if the receiver diversity exists, the procedure A2 is executed; otherwise, the single antenna signal-to-interference ratio of the user terminal needed to be scheduled is obtained and the procedure A3 is executed; A2. Two signal-to-interference ratios of the user terminal needed to be scheduled are obtained; the difference of the two signal-to-interference ratios is judged if the difference is more than the preset exception threshold, if the difference is more than the preset exception threshold, the average value of the two signal-to-interference ratios is excluded when theavailable load of the community is calculated; A3. the user terminal is judged if the user terminal is the last user terminal needed to be scheduled; if the user terminal is the last user terminal, the available load of the community is calculated and the user terminals which are not excluded are scheduled; otherwise, the next user terminal needed to be scheduled is processed with procedure A1; thereby, the calculation accuracy of the available load of the community is improved and the scheduling accuracy of the HSUPA is improved; the uplink business speed of the whole community is enhanced and the scheduling influence on other normal UE is reduced; the high-speed uplink packet access scheduling method is more applicable to the actual wireless environment.

Apparatus and methods for implementing "intelligent" receive diversity management in e.g., a mobile device.. In one implementation, the mobile device includes an LTE-enabied UE, and the intelligent diversity management includes selectively disabling receive diversity (RxD) in that device upon meeting a plurality of criteria including (i) a capacity criterion, and (it) a connectivity criterion. In one variant, the capacity criterion includes ensuring that an achievable data rate associated with a single Rx (receive) chain is comparable to that with RxD.

A method for adaptively disabling receiver diversity is provided. The method can include a wireless communication device determining an active data traffic pattern; defining a threshold channel quality metric based at least in part on a threshold channel quality needed to support a threshold quality of service for the active data traffic pattern; comparing a measured channel quality to the threshold channel quality metric; and disabling receiver diversity in an instance in which the measured channel quality metric satisfies the threshold channel quality metric.

The invention discloses a diversity receiving technology utilizing sea wave feature information. In order to solve the multi-path interference problem in sea surface beyond-visual-range communication. The sea wave feature information is utilized for realizing the time and frequency diversity receiving. A diversity receiver has the basic scheme that the diversity receiver comprises an FPGA (field programmable gate array), a microprocessor, an air speed and air direction sensor, a navigator and the like. The sea wave feature information is utilized, so that the multi-path signals can be effectively utilized, the diversity gain of the receiver is improved, further, the communication stability of the sea surface beyond-visual-range communication is improved, and the communication error rate is reduced.