99 results about "Diversity methods" patented technology

The invention discloses a space diversity method which comprises the following steps: using a space-frequency block code which is based on an alamouti code, as the minimum unit for a space-time code; carrying out orthogonal processing on the space-frequency block code to obtain transmission signals of part of eight antenna ports, and circularly delaying the acquired transmission signals of the antenna ports to obtain transmission signals of the rest of the antenna ports; and each antenna port transmits the acquired transmission signal on the corresponding subcarrier at the corresponding time. The invention also discloses a space diversity device which comprises an orthogonal processing module, a signal circular delay module and a transmission module. The method and the device of the invention can realize data transmission of eight antennae in a long-term evolution advanced system, and can obtain better diversity gains without increasing extra cost for pilot frequency.

A novel terrestrial wireless communications technique for terrestrial portable terminals including hand-held mobile devices and fixed wireless instruments, utilizing a spoke-and-hub communications system, having a plurality of individual hubs and / or base-stations all in communications with the portable terminals. The portable terminals and the hubs are assigned to use incompatible polarity formats in terms of circularly polarity (CP) and linearly polarity (LP). In forward links, a signal processed by the LP ground telecommunications hubs is radiated through multiple antennas with various LP polarities to an individual CP user simultaneously. The multiple paths are organized via assignments of a plurality of polarities, frequency slots, and directions by wavefront multiplexing / demultiplexing techniques such that the same communications assets including frequency spectrum may be re-used by other users. The same polarity diversity methods can be extended to peer-to-peer communications.

Disclosed herein is a diversity method for activating or deactivating a diversity function depending on the amount of power remaining in a power supply device and a mobile communication terminal incorporating the same. In an embodiment of the present invention, when the amount of power remaining in a power supply device is smaller than a reference value for the activation of a transmission / reception diversity function, which has been previously stored in memory, the transmission / reception diversity function is deactivated, and when the amount of power remaining in a power supply device is equal to or larger than the reference value, the transmission / reception diversity function is activated. In another embodiment, when the amount of power remaining in a power supply device is smaller than a reference value for the activation of a transmission or reception diversity function, which has been previously stored in memory, the transmission or reception diversity function is deactivated.

A method of recovering unknown aberrations in an optical system includes collecting intensity data produced by the optical system, generating an initial estimate of a phase of the optical system, iteratively performing a phase retrieval on the intensity data to generate a phase estimate using an initial diversity function corresponding to the intensity data, generating a phase map from the phase retrieval phase estimate, decomposing the phase map to generate a decomposition vector, generating an updated diversity function by combining the initial diversity function with the decomposition vector, generating an updated estimate of the phase of the optical system by removing the initial diversity function from the phase map. The method may further include repeating the process beginning with iteratively performing a phase retrieval on the intensity data using the updated estimate of the phase of the optical system in place of the initial estimate of the phase of the optical system, and using the updated diversity function in place of the initial diversity function, until a predetermined convergence is achieved.

The present invention discloses a method of adaptive weighting space-time transmit diversity, comprising: symbols to be transmitted at a transmitting end being output after being space-time encoded according to certain regulation, and the current transmission powers of the two antennae being real-timely adjusted according to the given transmission power weight values; after the transmission powers are determined, the space-time encoded output signals being sent out at two independent antennas by transmitting antenna array in terms of the current transmission power; the fading characters of two wireless channels being estimated by the receiver at a receiving end according to the present received signals and then fed back to the transmitting end; the transmitting end receiving and obtaining the fading amplitude characters of two wireless channels through feedback channel, calculating new adaptive weight values of transmission powers, and adjusting transmission powers according to these weight values. The present invention also discloses a system for implementing the above method of adaptive weighting Space-time Transmit Diversity. In term of the method and structure, the transmission powers can be dynamically adjusted in adaptive weighting manner, in order to boost system performance gain.