Abstract: Some embodiments include a system for simulating electromagnetic environments that includes a channel emulator having a plurality of outputs, each output associated with a different operational path. Each operational path has a power amplifier, an antenna and a first coupling mechanism. The power amplifier is coupled to an output of the channel emulator. The antenna is in communication with a test region of the apparatus. The first coupling mechanism simultaneously couples power to the antenna and to a first measurement path when the operational path is coupled to the test region, so that a calibration state of the operational path can be determined and adjusted without interruption of a signal coupled to the antenna in the operational path.

Abstract: In certain embodiments, an apparatus may comprise a circuit configured to receive a plurality of samples of an input signal. The circuit may update one or more equalizer parameters using partial zero forcing equalization. Further, the circuit may generate an equalized signal based on the plurality of samples of the input signal and the one or more equalizer parameters.

Abstract: A system and method for synchronizing two devices in communication with each other. When communication between the two devices is to be established, a synchronization process may be invoked. In an embodiment, a first device may initiate sending synchronization signals having rising edge and falling edge pairs. The second device may include a controller configured to receive the synchronization signals. However, noise may inhibit the ability of the controller to correctly receive and/or interpret the synchronization signals. Noise may cause detection components to falsely detect noise as a synchronization signal or may cause detection components to miss detection of an actual synchronization signal. A window generator may be used to generate comparison windows for the controller to detect synchronization signals.

Abstract: A receiver device implements enhanced data reception with edge-based clock and data recovery such as with a flash analog-to-digital converter architecture. In an example embodiment, the device implements a first phase adjustment control loop, with for example, a bang-bang phase detector, that detects data transitions for adjusting sampling at an optimal edge time with an edge sampler by adjusting a phase of an edge clock of the sampler. This loop may further adjust sampling in received data intervals for optimal data reception by adjusting the phase of a data clock of a data sampler such a flash ADC. The device may also implement a second phase adjustment control loop with, for example, a baud-rate phase detector, that detects data intervals for further adjusting sampling at an optimal data time with the data sampler.

Abstract: The patent application discloses data transmission method, a base station, network controller and terminal. The base station includes a receiver, configured to receive codebook instruction from a network controller; a processor, configured to select one or more coordination codebooks from the one or more codebooks specified in the codebook instruction; and a transmitter, configured to send a codebook notification to the terminal. One or more codebooks that can be used by the base station in data transmission with a terminal are specified in the codebook instruction. The selected one or more coordination codebooks are specified in the codebook notification. The base station is one of a coordinating cluster of base stations that perform data transmission with the terminal.

Abstract: A transmission apparatus includes a connector that couples a signal path to a receiver, an equalizer that performs an equalization operation on received signals to be input to the receiver via the connector, a controller that calculates a coefficient controlling an operation of the equalizer and sets the coefficient in the equalizer, and a detector that detects a mating fault of the signal path in the connector in response to the coefficient configured by the controller.

Abstract: A method includes receiving a serial data stream at a transmitter of a serial channel, encoding the serial data stream using a quaternary pulse amplitude modulation (PAM-4) scheme into a stream of 2-bit symbols, wherein a particular symbol is represented as a signal at one of four signal levels provided for a unit interval of time, determining that a first symbol of the encoded serial data stream is represented as a highest state of the PAM-4 scheme, and, in response, providing a first output signal on an output of the transmitter, wherein the first output signal includes a first portion at a first voltage level associated with the highest state for a first half of a first unit interval of time associated with the first symbol, followed by a second portion at a second voltage level associated with a de-emphasized highest state of the PAM-4 scheme for a second half of the first unit interval of time.

Abstract: One communication system includes a first die, a second die and a front-end circuit. The first die has an up-converter and a digital baseband (DBB) processing circuit. The second die has a down-converter. The front-end circuit couples an antenna to the first and second dies. Another exemplary communication system includes a first die, a second die and a front-end circuit. The first die performs digital baseband (DBB) processing, and generates a first signal with a higher frequency according to a second signal, wherein the second signal is derived from an output signal of the DBB processing. The second die generates a third signal with a lower frequency according to a fourth signal. The front-end circuit couples the first signal from the first die to an antenna and couples the fourth signal from the antenna to the second die.

Abstract: An apparatus, and related method, relates generally to viable bandwidth filtering. In such an apparatus, an analysis filter bank has path filters associated with different bandwidths and is configured for filtering and transforming an input signal having a first bandwidth into a first interleaved output. A mask is coupled to the analysis filter bank and configured for masking at least one narrowband time signal of the first interleaved output. A synthesis filter bank is coupled to the mask. The synthesis filter bank is configured for transforming and filtering the masked first interleaved output to generate a second interleaved output for constructing an output signal having a second bandwidth. The second bandwidth is different than the first bandwidth for the variable bandwidth filtering.

Abstract: A radio communications method includes carrying out, by a transmitter: providing a digital time signal carrying digital symbols to be transmitted; and transmitting a radio frequency signal carrying the digital time signal. The method further includes carrying out, by a receiver: receiving the radio frequency signal transmitted by the transmitter; processing the received radio frequency signal to obtain a corresponding incoming digital signal; and extracting, from the incoming digital signal, the digital symbols carried by the incoming digital signal. The digital time signal carrying the digital symbols to be transmitted results from an approximation of the Hilbert transform in frequency domain, which approximation is based on a frequency main mode and one or more frequency twisted modes, wherein the frequency main and twisted modes carry, each, respective digital symbols to be transmitted.

Abstract: The object of the present invention can be achieved by providing a method of transmitting broadcast signals including encoding Data Pipe, DP, data, wherein the encoding further includes Forward Error Correction, FEC, encoding the DP data, Bit interleaving the FEC encoded DP data and mapping the bit interleaved DP data onto constellations; building at least one signal frame by mapping the encoded DP data; and modulating data in the at least one built signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, method and transmitting the broadcast signals having the modulated data, wherein each of the at least one signal frame includes at least one preamble having repeated at least one signaling information.

Abstract: Certain aspects of the present disclosure relate to techniques and apparatus for improving decoding latency and performance of Polar codes. An exemplary method generally includes generating a codeword by encoding information bits, using a multi-dimensional interpretation of a polar code of length N, determining, based on one or more criteria, a plurality of locations within the codeword to insert error correction codes generating the error correction codes based on corresponding portions of the information bits, inserting the error correction codes at the determined plurality of locations, and transmitting the codeword. Other aspects, embodiments, and features are also claimed and described.

Abstract: A frequency converter (100, 200, 300, 500, 600) comprising a first mixer (105) arranged to receive a first and a second input signal and to have as its output the sum and the difference of the first and second input signals. The frequency converter (100, 200, 300, 500, 600) also comprises generating means (120) for generating the second input signal and for receiving the output signal of the first mixer (105) and multiplying it by a signal at a frequency which is two times the frequency of the second input signal, thereby generating a product. The frequency converter (100, 200, 300, 500, 600) also comprises adding means (110) for obtaining the sum of this product and the output signal from the first mixer.

Abstract: The invention relates to the information transmission between a data-transmitting apparatus and a read- and/or write module, in particular for the use of access control. According to the invention, data to be transmitted is represented as a digital signal by the data-transmitting apparatus, and this signal is converted into an ultra-broadband signal by way of the spread spectrum method, and capacitively and/or resistively transferred via the body of the user to the write- and/or read module.

Abstract: Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence.

Abstract: A multi-input receiver including a plurality of RF antennas, a multi-channel receiver, an input port configuration block (IPCB), and a configuration block controller. The IPCB includes at least two two-way connection modules, at least one four-way connection module, at least one direct connection module, and a plurality of electronic signal pathways. Each connection module includes a connection module input port communicatively coupled to an RF antenna of the plurality of RF antennas, a connection module output port communicatively coupled to a channel of the multi-channel receiver, and a mechanical diversion switch. The mechanical diversion switches and the plurality of electronic signal pathways are positioned and configured such that the mechanical diversion switch of each connection module communicatively couples a splitter bypass signal, a 1×2 signal, or a 1×4 signal to the connection module output port on a selective basis.

Abstract: A communication verification system is provided. The communication verification system includes a local transmitting-end unit, a remote receiving-end unit, and a repeater device. The local transmitting-end unit is set to a first computing mode and outputs an initial value. The remote receiving-end unit is set to a second computing mode. The repeater device receives the initial value from the local transmitting-end unit and outputs an initial value to the remote receiving-end unit according to the second computing mode. The repeater device receives and stores a computation result from the remote receiving-end unit, and then outputs a confirmation signal to the local transmitting-end unit according to the first computing mode. The repeater device outputs the computation result to the local transmitting-end unit for verification when the repeater device receives a query signal from the local transmitting-end unit.

Abstract: The present invention relates to a method and apparatus for transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently.

Abstract: A communication method for embedding a meta-carrier under an original carrier signal with reduced or minimal original carrier signal degradation, the method comprising transmitting an original carrier signal and transmitting a meta-carrier signal separate from the original carrier signal, wherein the meta-carrier signal contains information about an original carrier signal, is extractable under an interfered condition, and is transmitted such that the meta-carrier signal occupies at least a portion of a bandwidth of the original carrier signal.

Abstract: A receiver, including: a tuner receiving an input signal; a signal processor configured to process the input signal; an automatic gain control (AGC) controller configured to: initialize the receiver in a low gain state; determine the presence of a signal; and increase the receiver gain to determine if a weak signal is present prior to a strong signal.