摘要:
The invention relates to a system and method for localization positioning in lighting systems. At least two of a Time Difference of Arrival (TDOA), Angle of Arrival (AOA), Received Signal Strength Index (RSSI) and a Position Estimation Algorithm with unified TDOA and RSSI are used to obtain localization positioning. The schemes introduce a maximum-likelihood estimation strategy incorporating a partial derivative matrix for each lighting unit using at least two reference nodes in order to achieve higher accuracy.
摘要:
The invention relates to a system and method for localization positioning in lighting systems. At least two of a Time Difference of Arrival (TDOA), Angle of Arrival (AOA), Received Signal Strength Index (RSSI) and a Position Estimation Algorithm with unified TDOA and RSSI are used to obtain localization positioning. The schemes introduce a maximum-likelihood estimation strategy incorporating a partial derivative matrix for each lighting unit using at least two reference nodes in order to achieve higher accuracy.
摘要:
A first wireless device communicates data to a second wireless device. The first wireless device employs at least one of a first interleaving scheme and a first sub-carrier mapping scheme to produce a first data packet from a first plurality of data bits, and transmits the first data packet to the second wireless device. When the first data packet is not received correctly by the second wireless device, then the first wireless device employs at least one of a second interleaving scheme and a second sub-carrier mapping scheme to create a second data packet from the first plurality of data bits, and transmits the second data packet to the second wireless device.
摘要:
A method (200) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S210); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.
摘要:
A medical system includes one or more MBAN devices which acquire and communicate patient data. One or more medical body area network (MBAN) systems include the one or more MBAN devices communicating the patient data with a hub device via short-range wireless communication. The communication of the patient data via the short-range wireless communication being within a predefined spectrum. The hub device receives patient data communicated from the one or more MBAN devices, communicates with a central monitoring station via a longer range communication and one or more access points (AP), and determines the location of the MBAN system in reference to a healthcare facility. The one or more MBAN devices are inhibited from transmitting within the predefined spectrum when the MBAN hub device is located outside the healthcare facility.
摘要:
A wireless bit-interleaved coded OFDM (BI-COFDM) multiple-in-multiple-out (MIMO) system that improves the diversity seen by a convolutional decoder. The bit stream is interleaved first, then bits are mapped into symbols and then symbols are parsed into Nt separate streams, where t is the number of transmitters. A deinterleaver then performs the inverse permutation before sending the symbols to a Viturbi decoder. In another embodiment, a transmitting side bit-interleaver transforms an encoded and punctured bit stream using a first permutation, groups the transformed bit stream according to a desired constellation on one of Nt antennae, splits the transformed bit stream into separate streams accordingly and bit-interleaves/symbol-maps using a plurality of bit-interleavers/symbol-mappers to permute each stream using a second permutation. A receiving side performs the inverse operations of the transmitting side.
摘要:
A system includes a first primary wireless system (120) that communicates over a first range, and a first beaconing device (130) associated with the first primary wireless system (120). The first beaconing device (130) communicates over at least at a second range, wherein the second range is greater than the first range. The first beaconing device listens for beacons (510) from other beaconing devices (130) associated with other primary wireless systems (120) on a plurality of channels over which the other primary systems may operate. After listening for beacons from the other beaconing devices (130) associated with other primary wireless systems, the first beaconing device transmits a first beacon (510) to a wireless device (114) of a secondary wireless system (110) that may communicate over the second range. The first beacon includes data indicating an occupation of a first one of the channels by the first primary wireless system (120).
摘要:
The present invention, generally speaking, provides interleavers and methods of interleaving that satisfy the need for backward compatibility while effectively addressing competing design objectives. In accordance with one aspect of the invention, data is transmitted using a number of transmit antennas greater than an expected number of receive antennas. At least one pair of transmit antennas is formed, and multiple second data streams are formed from a first data stream, successive bits in said first data stream being assigned to different ones of said second data streams. Block interleaving of multiple respective ones of said second data streams is individually performed. During successive transmission intervals, the pair of transmit antennas is used to transmit a pair of data symbols taken from different ones of said second data streams, followed by an equivalent transformed pair of data symbols.
摘要:
Diversity techniques are commonly used in wireless communications to combat multi-path fading. Recent interests in ultra-wideband technology focus on multi-band OFDM systems that can explore the high diversity due to the independent frequency bands. To achieve full diversity with high data rate, a system (800), apparatus (500) and method that uses coded modulation with spreading rotation of transmitted signals. A 2×2 integer rotation matrix for QAM signals, 3×3 and 4×4 integer rotation matrices for QAM signals are provided. Compared with the non-regular QAM shape for real rotation matrices, each of these integer rotation matrices makes the regular QAM shape after rotation. The systematic design of these spreading matrices can be used to simplify the receiver structure such as simplified ML, MMSE and ZF, and then reduce their decoding complexity. Further, the present invention achieves cooperative diversity not only from distributed users but also from the signal space diversity of each user. An embodiment is provided for a cooperative system (100) in which different rows of integer rotation matrices are used by a source and relays as a modulation scheme to increase cooperative diversity.
摘要:
The present invention provides a system (400), device (200, 300), and method (200) for a spatial multiplexing (SMX) transmission scheme combined with symbol spreading and rotation using a pre-determined matrix R, which can greatly improve system performance without requiring additional bandwidth or power consumption under fast Rayleigh flat fading channels or high frequency-selective channels in UWB systems. Because of the lattice-based structure, sphere decoding is employed to reduce the complexity of ML decoding while maintaining the near ML performance. On the other hand, ZF and MMSE receivers can also be used due to the systematic structure at the transmitter.