A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only simple arithmetic operations, such as negation and conjugation. The diversity created by the transmitter utilizes space diversity and either time or frequency diversity. Space diversity is effected by redundantly transmitting over a plurality of antennas, time diversity is effected by redundantly transmitting at different times, and frequency diversity is effected by redundantly transmitting at different frequencies: Illustratively, using two transmit antennas and a single receive antenna, one of the disclosed embodiments provides the same diversity gain as the maximal-ratio receiver combining (MRRC) scheme with one transmit antenna and two receive antennas. The principles of this invention are applicable to arrangements with more than two antennas, and an illustrative embodiment is disclosed using the same space block code with two transmit and two receive antennas.

In an exemplary embodiment, a network node can receive signals from user devices in a wireless communication network. The network node can combine the signals received at each receive antenna of the network node based on vectors from a pre-defined set of vectors. The network node can also process the combined signals to obtain an estimate of the signals.

A communication system is used to receive information from mobile sources. The system includes a plurality of antennas including multiple disjoint sets of multiple antennas configured to receive signals from the multiple mobile sources. At least a subset of the antennas have coverage areas that overlap with antennas in another set of the multiple disjoint sets of multiple antennas. The communication system also includes multiple receivers and multiple signal paths including one signal path for each set of multiple antennas. Each signal path is configured to provide outputs from a corresponding set of multiple antennas of the multiple disjoint sets of antennas to each of the multiple receivers. Each of the receivers choose to output information from one or more of the signal paths based on one or more characteristics of the signals received from the signal paths.

A communication system comprises an access point (203) communicating via a directional beam and a first and second wireless modem (111, 703) for establishing a first and respectively second mm wave radio communication link to the first access point (203). The first and second wireless modems (111, 703) are located on a vehicle (103) and employ electronically steerable beamforming directional antennas having a first main beams for establishing the radio communication links. A scheduler (801) schedules data of the communication over the first mm wave radio communication link and the second mm wave radio communication link in dependence on a link quality of at least one of the first mm wave radio communication link and the second mm wave radio communication link. The main beams may be formed in substantially the same direction.

A characteristic variable antenna configured to be able to select or switch antenna characteristics in accordance with a predetermined periodic variable timing, an RF unit configured to perform a reception process on a signal received by the characteristic variable antenna, an ADC unit configured to sample the analog signal input from the RF unit at a sampling period corresponding to the variable timing of the antenna characteristics of the characteristic variable antenna, a signal dividing unit configured to divide the digital signal input from the ADC unit into different digital signals in accordance with the antenna characteristics and output the divided different digital signals, a MIMO-OFDM demodulation unit configured to receive inputs of the different digital signals divided by the signal dividing unit and perform a demodulation process of predetermined MIMO-OFDM, and a control unit configured to periodically select or switch the antenna characteristics of the characteristic variable antenna in accordance with the sampling period of the ADC unit are included.

A single-carrier-modulation communication system for transmitting data over a wireless link, the communication system including, on a first side of a wireless link one single-carrier-modulation receiver associated with a single antenna, on a second side of the wireless link a plurality of antennas and a plurality of single-carrier-modulation transmitters, each one of the plurality of transmitters associated with one of the plurality of antennas, the transmitters each further associated with a pre-coding filter, and the plurality of transmitters are arranged to each transmit same data via a respectively associated pre-coding filter and the associated antenna, using the pre-coding filters to perform beam-forming to the one receiver. Related apparatus and methods are also described.

A communication apparatus 300 includes a first channel estimating unit 131 configured to perform a first channel estimation at a first frequency using a reference signal included in a signal sequence, a first weight information generating unit 133 configured to generate first weight information based on the first channel estimation, a synthesis processing unit 135 configured to perform weighted synthesis processing based on the first weight information, a second channel estimating unit 137 configured to perform a second channel estimation at a second frequency higher than the first frequency using a reference signal included in the signal sequence subjected to the weighted synthesis processing, a second weight information generating unit 139 configured to generate second weight information based on the second channel estimation, and a demodulation processing unit 141 configured to perform demodulation processing of the signal sequence subjected to the weighted synthesis processing based on the second weight information.

Methods and systems are provided including a system for signal detection and digital bandwidth reduction in a phased array comprising a digital phased array receiving system, digital beamforming network, and central system-level processing system. In at least one embodiment, a system for signal detection and digital bandwidth reduction in a phased array is provided that includes a digital phased array receiving and transmitting system, a plurality of digital processing nodes, transceivers, and a core processing node, and a plurality of digital beamforming nodes. The exemplary the digital processing nodes including control sections that each perform preprocessing to identify signals with predetermined signal characteristics. The exemplary said preprocessing further includes selecting reflected signals received by the digital phased array receiving and transmitting system having one or more of the predetermined signal characteristics. The selected reflected signals reduced in size and passed to the core processing node with radar data sets.

A reconfigurable RF receive diplexer, which includes a first hybrid RF coupler, a second hybrid RF coupler, and reconfigurable RF filter circuitry, is disclosed. The reconfigurable RF receive diplexer receives a first adjunct RF antenna receive signal via a first isolation port to provide a first adjunct RF receive signal via a second main port. The reconfigurable RF receive diplexer further receives a first RF transmit signal via a first main port to provide a first RF antenna transmit signal via the first isolation port. The reconfigurable RF receive diplexer operates in each of a group of operating modes, such that during a first operating mode, a carrier frequency of the first adjunct RF antenna receive signal is within a first RF communications band; and during a second operating mode, a carrier frequency of the first adjunct RF antenna receive signal is within a second RF communications band.