摘要:
A diversity antenna system including a plurality of antennas can include an antenna interface circuit configured to connect an antenna of the plurality of antennas to a transceiver using an antenna selection signal. The antenna control circuit can be configured to produce the antenna selection signal using at least one of a random sequence generator configured to generate a random antenna selection signal or a predetermined sequence generator configured to generate a predetermined antenna selection signal according to a predetermined sequence.
摘要:
A communications method for a vehicle consist (10) comprising a lead vehicle (14) having a first (29A) and second (29B) antenna associated with a respective first (28A) and second (28B) transceiver and a remote vehicle (12A/12B/12C) having a third (29A) and fourth (29B) antenna associated with a respective third (28A) and fourth (28B) transceiver. The method further comprises transmitting an outbound message from the first transceiver (28A) via the first antenna (29A) or from the second transceiver (28B) via the second antenna (29B), the outbound message comprising a plurality of message bytes, receiving the outbound message at the third (29A) and fourth (29B) antennas and associated third (28A) and fourth (28B) transceivers, determining correct bytes and error bytes in the outbound message as received at the third transceiver (28A), determining correct bytes and error bytes in the outbound message as received at the fourth transceiver (28B), and assembling a reconstructed message using correct bytes from the message received at the third transceiver (28A) and the fourth transceiver (28B).
摘要:
A data transmission method for multiple users having multiple receive antennas is provided. The method includes selecting a receive antenna among the multiple receive antennas for each user, performing DPC (Dirty Paper Coding) from the multiple transmit antennas to the receive antenna and transmitting a transmission signal on which the DPC is performed. Since DPC is implemented through a receive antenna selected among multiple receive antennas, complexity is not much increased although the DPC is applied to a MIMO system.
摘要:
Aspects of the present disclosure propose a method for determining preferred transmit and receive antenna patterns of a wireless device with respect to another wireless device. The method generally includes determining the beamforming or calibrating coefficients corresponding to the preferred transmit and receive antenna patterns of a wireless device iteratively.
摘要:
Provided is a low-complexity transmit/receive antenna selection method for Multi-Input Multi-Output (MIMO) systems. The method includes the steps of generating a gain matrix of receive channel, calculating norm values of channel gains for each row (receive antennas) and column (transmit antennas) of the generated gain matrix of the receive channel, selecting an antenna with the maximum norm value among the calculated norm values of channel gains, and repeatedly performing the process of alternately selecting transmit and receive antennas having the maximum channel gain value among the channel gain values of the selected antenna until a required number of antennas is all selected.
摘要:
A radio-over-fiber (RoF) wireless picocellular system adapted to form an array of substantially non-overlapping individual picocells by operating adjacent picocells at different frequencies is operated to form one or more combined picocells. The combined picocells are formed from two or more neighboring picocells by the central head-end station operating neighboring picocells at a common frequency. Communication between the central head-end station and a client device residing within a combined picocell is enhanced by the availability of two or more transponder antenna systems. Thus, enhanced communication techniques such as antenna diversity, phased-array antenna networks and multiple-input/multiple-output (MIMO) methods can be implemented to provide the system with enhanced performance capability. These techniques are preferably implemented at the central head-end station to avoid having to make substantial changes to the wireless picocellular system infrastructure.
摘要:
Receivers and methods are provided that include multiple modes of processing signals from multiple antennas. These include legacy, SAIC (single antenna interference cancellation) and MSRD. Various methods are provided for selecting an appropriate receiver processing function. These include looking at correlation and gain imbalance between antennas, looking at the processing gain resulting from one or more of the receiver processing functions, and looking at the equalization quality of at least two receiver processing functions.
摘要:
An apparatus and method for selecting antennas in a MIMO multi-carrier system is provided to effectively select a receive antenna group with better signal detection capability, thereby enhancing system performance. The apparatus includes a channel estimator and an antenna selector. The channel estimator generates a channel matrix of each MIMO channel in response to each sub-carrier. The antenna selector generates a parameter of transmission capacity for each possible receive antenna group in response to each sub-carrier, and selects a receive antenna group with an optimal overall transmission capacity according to the parameter of transmission capacity.
摘要:
Embodiments disclosed herein relate to a directional diversity receive system. The system may comprise a plurality of antennas attached to and fixed with respect to a frame. The system may further comprise a steerable antenna attached to and moveable with respect to the frame. The system may be encapsulated by a cover and may be configured for relocation as an integrated module.
摘要:
A radio system for the reception of broadcast signals is provided that includes two antennas picking up radio signals and two signal receivers receiving the radio signals, the two antennas and the two receivers operating in diversity operating modes. The radio system further includes an antenna switching unit for creating a connection between the receivers and the antennas and a control unit for controlling the antenna switching unit and selecting the operating mode according to predetermined diversity control criterion.