Abstract:
Disclosed are methods, circuits, apparatus and systems for facilitating wireless data communication. According to some embodiments, there may be provided a wireless access point including a set of N antenna elements adapted to receive a transmission, wherein the transmission may include one or more data streams. There may be provided a multi-stream wireless modem circuit including a set of K received signal input nodes. According to further embodiments, a received signal translation block may be adapted to translate a data baring radio frequency signal received through the set of N antenna elements into signal inputs applied at some or all of the K received signal input nodes, wherein translating may include using a translation matrix and/or applying an MRC.
Abstract:
A method, apparatus, and computer program for controlling diversity reception in a radio receiver are provided. The radio receiver is configured to either activate or disable the diversity reception according to an application type of an application requesting transfer of data.
Abstract:
The present invention relates to a method and system for adapting a wireless communication system to support a desired functionality of the wireless communication system at an optimized performance and economic benefit. The desired functionality can be determined by defined criteria such as a maximum range of communication with the wireless communication system, quality of a transmission link in the wireless communication system, capacity of the wireless communication system, power consumption of the wireless communication system, protocols supported in the wireless communication system, modulation techniques used in the wireless communication system and processing techniques for combining signals in the wireless communication system. The system can be adapted by varying one or more of the number of components or processing techniques used in the wireless communication system.
Abstract:
An apparatus and method for controlling a whitening function of a whitening Maximum Ratio Combining (MRC) in a receive end of a multiple antenna system are provided. The method includes identifying if there is interference from at least one neighbor cell, if there is interference, generating a weight of the whitening MRC using a pre-whitening inverse matrix, and, if there is no interference, generating a weight of the whitening MRC using a unit matrix, thus being capable of improving a reception performance of the receive end.
Abstract:
A system comprises an outer shell having an inner spherical cavity and an inner sphere located in the spherical cavity. The inner sphere comprises a sensor; at least one transmit antenna; and at least one transmitter coupled to the sensor and to a respective one of the at least one transmit antenna. The system also comprises a first receive antenna located in the spherical cavity; a second receive antenna located in the spherical cavity; and a receiver located outside of the outer shell. The receiver is configured to determine the signal to noise ratio of a first signal received at the first receive antenna and the signal to noise ratio of a second signal received at the second receive antenna; and to combine the first and second signals based on the respective signal to noise ratios such that interference due to multi-path signals in the spherical cavity is reduced.
Abstract:
Retransmitting a data sequence over a wireless network according to channel conditions proceeds by transmitting a first transmitting signal representing the data using a first set of beamforming weighting vectors generated according to a first channel condition. A request for re-transmitting the data sequence is received when the first transmitting signal suffers from unrecoverable errors. A re-transmission function is computed according to a second channel condition, and a second transmitting signal is transmitted as generated by using the re-transmission function that is created according to the second channel condition. The data sequence is demodulated and decoded using the first transmitting and the second transmitting signals.
Abstract:
An antenna system and method utilize an evaluation branch circuit and an implementation branch circuit. These circuits are each connected to both a first antenna input and a second antenna input. An output of the evaluation branch circuit is in communication with a controller while an output of the implementation branch circuit is in communication with a receiver. Each branch circuit includes at least one signal conditioner to change an electrical characteristic of RF signals received from antennas via the antenna inputs. The evaluation branch circuit, controlled by the controller, changes the electrical characteristics of the RF signals in a variety of different ways to discover an optimized evaluation RF signal. Once the optimized evaluation RF signal is determined, the implementation branch circuit is controlled, by the controller, to produce an optimized implementation RF signal in accordance with that discovered by the evaluation branch circuit.
Abstract:
In one embodiment, the present invention provide a method for detecting signal quality metrics of a constant modulo (CM) signal received in two different signal paths, and combining the signal from the two signal paths based at least in part on the detected first and second signal quality metrics. Such method may be implemented in a radio receiver such as an automobile receiver.
Abstract:
A radio network control method that allows uplink signals transmitted by a mobile station to be received by two or more selected base station radio systems and then combined, thus providing receiver diversity. The method requires measurement of radio link qualities of the OFDM signals passing between mobile station and base station radio system. The method is selectively applied to individual mobile stations and for each mobile station to a selection from the available base station radio systems—the selection being based upon the relative and/or absolute measurements of radio link qualities.
Abstract:
A method and apparatus for processing a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol. The method includes generating an estimate of a channel for each sub-carrier of the frequency domain digital OFDM symbol; generating channel state information corresponding to each sub-carrier of the frequency domain digital OFDM symbol; and generating a plurality of demodulated symbols based, at least in part on, the estimate of the channel for each sub-carrier of the frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol, in which each demodulated symbol corresponding to a given sub-carrier of the frequency domain digital OFDM symbol. The method further includes performing a soft-decision decoding on each demodulated symbol to generate a corresponding soft-decision decoded symbol. The soft-decision decoding of each demodulated symbol is based, at least in part, on the channel state information corresponding to the given sub-carrier associated with the demodulated symbol.