Abstract: A method implemented in a base station used in a wireless communications system is disclosed. The method comprises having 1-layer, 2-layer, 3-layer, and 4-layer codebooks for 4 transmit antenna (4TX) transmission, each codebook including a plurality of precoding matrices, (precoding data with one of the plurality of precoding matrices, and transmitting, to a user equipment, the precoded data, wherein each of the 1-layer and 2-layer codebooks comprises a first codebook and a second codebook, and wherein each precoding matrix in the first codebook comprises a first index and a second index. Other apparatuses, systems, and methods also are disclosed.

Abstract: Systems, apparatus, and methods of asynchronous digital communication include at least one transmitter and/or at least one receiver communicatively coupleable to at least one communication interface for encoding and transmitting digital information as and/or receiving and decoding digital information from a transition between a first symbol and a second symbol, based on a predetermined relationship between the first symbol and the second symbol in such a way that the timing of the symbols is no longer relevant.

Abstract: An arrangement for detecting signaling data from bootstrap Orthogonal Frequency Division Multiplexed (OFDM) symbols in the frequency domain, which can provide a more accurate estimate of the signaling data than other arrangements that operate in the time domain. The arrangement includes detecting a cyclic shift of a signature sequence, which has been applied to represent the signaling data, as an average phase change between each of the sub-carriers of the bootstrap OFDM symbol. As a result the signaling data can be more accurately detected or detected at lower signal to noise ratio.

Abstract: A mobile communication device may include a radio transceiver configured to transmit and receive communication signals, and a baseband modem circuit configured to determine a decoded information field of a first encoded system information packet, set one or more bits of the decoded information field as an initial encoder state of a convolutional decoder for decoding the first encoded system information packet, decode the first encoded system information packet with the initial encoder state to obtain a first decoded system information packet, and use the decoded system information packet to transmit or receive data with one or more network cells.

Abstract: A method for adaptively-tuned digital self-interference cancellation comprises receiving a digital transmit signal; receiving a transform configuration; generating a set of signal components from the digital transmit signal; transforming the set of signal components into a digital self-interference cancellation signal according to the transform configuration; combining the digital self-interference cancellation signal with a receive signal to form a digital residue signal; detecting a trigger; in response to detecting the trigger: computing a ratio of the digital residue signal to the digital transmit signal; converting the ratio to the frequency-domain to form a frequency-domain-converted ratio; computing a frequency-domain self-interference channel between the transmitter and the receiver based on the frequency-domain-converted ratio; computing an inverse discrete Fourier transform matrix based on a portion of the discrete Fourier transform matrix; converting the frequency-domain self-interference channel t

Abstract: A system providing a spread spectrum and a narrowband data transmission may comprise a DSSS transmitter and a DSSS receiver. The DSSS transmitter may convert a bit succession (di) into a chip succession (sk) using a chip sequence (cj, cj?) and send a succession of impulses (s(t)) corresponding to the chip succession (sk). The DSSS receiver may receive impulses (s(t)) sent by the transmitter and filter the received impulses (r(t)) using a filter having an impulse response (x(t)) dependent on the chip sequence (cj, cj?). The chip sequence (cj) may be a spread sequence. The narrowband data transmission may use chip sequence (cj?) and a corresponding impulse response (x(t)) of the filter. The chip sequence (cj?) does not comprise a succession having two directly successive arithmetic sign changes and an arithmetic sign change does not occur after the first and before the last chip in the chip sequence (cj?).

Abstract: A method for determining a symbol boundary in a data packet belonging to a received OFDM signal is provided. The data packet includes a first training filed and a second training field, which begins with a guard interval. The method includes detecting the beginning of the data packet, and starting an automatic gain control process. The method further includes, after the automatic gain control process is locked, determining autocorrelation peaks and estimating the symbol boundary from times of the autocorrelation peaks.

Abstract: A communication system includes a receiving circuit and a phase error estimating circuit. The receiving circuit receives an input signal x, which has an input phase ? in a polar coordinate system. According to partial differentiation performed on the natural logarithm of a function f(x, ?), the phase error estimating circuit generates an estimated phase error of the input signal x. f(x, ?) represents a probability function of receiving the input signal x at the receiving circuit.

Abstract: The disclosure is directed to a signal detection system. The system includes a receiver configured to receive data comprising noise and a signal having an amplitude lower than that of the noise received by the receiver. The system also includes a detection module configured to receive the data received by the receiver, define a region of interest of the data, compare a plurality of portions of the region of interest, and identify a portion of the region of interest that is more likely to contain the signal.

Abstract: Embodiments provide solutions to reduce power utilization (either at individual cable modems or in the overall network) in future cable modem networks. Particularly, embodiments seek to reduce power utilization at individual cable modems and in the overall network, by allocating upstream frequency bands and/or transmission modulation schemes among cable modems while accounting for cable loss experienced by individual upstream cable modem transmissions. According to embodiments, frequency spectrum and modulation scheme allocation techniques are provided to optimize power utilization and enable lower upstream transmission power by cable modems while maintaining similar signal strength of received signals or lower signal strength with reduced SNR requirements using lower capacity modulation at the headend.

Abstract: The present disclosure discloses a transmitter and a monitoring system using this transmitter, the transmitter includes: a multi-to-one multiplexing switch configured to receive a plurality of sensor signals of a plurality of channels through a plurality of input terminals, select one sensor signal from the plurality of sensor signals, and output the selected sensor signal through a output terminal; a first variable gain amplifier configured to receive the selected sensor signal, amplify the selected sensor signal with a gain within a first gain range, and output the amplified sensor signal; a control parameter input terminal configured to receive an input control parameter from outside of the transmitter; and an operating and switching selector configured to perform operations according to the input control parameter, so as to control the multi-to-one multiplexing switch to select the one sensor signal and control the gain of the first variable gain amplifier.

Abstract: The invention is directed to systems, methods and computer program products for determining an operational mode for a device in a network. An exemplary method comprises determining a device has a first antenna and a second antenna; determining a first number of multipath components and associated power levels for the first antenna; determining a second number of multipath components and associated power levels for the second antenna; and determining an operational mode for the device based on the first number of multipath components and its associated power levels for the first antenna and the second number of multipath components and its associated power levels for the second antenna.

Abstract: A signal receiving apparatus receives a radio frequency signal sent by a signal transmitting apparatus, where the radio frequency signal includes a transmit end image component. The signal receiving apparatus generates a receive end image component after performing down-conversion processing on the radio frequency signal. The signal receiving apparatus separately removes the receive end image component and the transmit end image component by performing quadrature modulation compensation twice.

Abstract: Embodiments of the present invent provide a method for selecting a pre-coding matrix indication, an apparatus and a system. In embodiments the method includes sending, by a base station, indication information to a terminal, wherein the indication information is used to instruct the terminal to send uplink data without weighting the uplink data or after weighting the uplink data by using an identity matrix and receiving, by the base station, the uplink data sent by the terminal. The method further includes selecting, by the base station, a first pre-coding matrix indication (PMI) from a pre-coding matrix indication set of the base station according to the uplink data and sending the first PMI to the terminal.

Abstract: This disclosure is directed towards techniques and methods of suppressing the effect of modulated clock jitter in a digital to analog conversion (DAC) circuit of a polar modulator in a transceiver. A phase locked loop (PLL) in a modulator circuit may introduce a deterministic jitter in DAC generated pulses which may lead to amplitude variations in the DAC generated pulses. The clock jitter may change the duty cycle of the input amplitude to the DAC which may result in a variation of the output of the DAC generated pulse. A digital pre-distortion or digital multiplier circuit may be introduced before the DAC circuit to increase or decrease the DAC amplitude to compensate for the pulse width modulation.

Abstract: Systems and methods for resolving identification code ambiguities in wireless access networks are described. In some embodiments, the systems and methods access an identification code associated with a cell in a wireless access network that is detected by a mobile device, determine a probability score for candidate cells that are assigned the identification code in the wireless access network, the probability score based on a likelihood that a candidate cell is a cell in the wireless access network associated with the identification code detected by the mobile device, and select one of the candidate cells as an origination cell of the identification code detected by the mobile device based on the determined probability scores.

Abstract: A communication device is configured to perform symbol mapping of bits to generate modulation symbols using one or more modulations. The device may employ a blended modulation composed of bit labels or symbols having different numbers of bits per symbol and different modulations. For example, the device may symbol map bit labels/symbols having first number of bits per symbol to first modulation, and the device may symbol map labels/symbols having second number of bits per symbol to second modulation. The device may be configured to perform forward error correction (FEC) or error correction code (ECC) and coding of information bits to generate coded bits that subsequently undergo symbol mapping. The device may be configured to operate based on different operational modes based on substantially uniform steps of rates, or bits per symbol, and energy per bit or symbol to noise spectral density ratio (Eb/N0 or Es/N0).

Abstract: Disclosed is a Link 16 terminal having a receiver and a transmitter. The receiver may be configured to process received signals in a receive mode to produce digitized samples, which may then be processed in a digital signal processor. The transmitter may be configured to produce a transmit signal that is provided to an antennas for transmission during transmit mode. The transmit signal may also be provided to the receiver in transmit mode to produce digitized samples of the transmit mode, may then be processed in a digital signal processor for compliance with requirements for Link 16 transmissions.

Abstract: Disclosed is a notification method for a scenery area based on an Ad Hoc network, including the following steps that: a guide information sending terminal is arranged at each scenery spot in the scenery area; the guide information sending terminal sends guide information periodically; a tourist terminal inside a radio transceiving range of the guide information sending terminal, after receiving the guide information, generates forwarded information and broadcasts it, and then sends reply information to the guide information sending terminal; a tourist terminal outside the radio transceiving range of the guide information sending terminal, after receiving the forwarded information, generates its own forwarded information and forwards it, and further judges whether itself is at the scenery spot where the guide information sending terminal is located according to the forwarded information, and if so, it sends reply information to the guide information sending terminal; and the guide information sending terminal

Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an input formatter for input formatting one or more data streams into one or more service data, an encoder for encoding the service data, a mapper for mapping the encoded service data onto constellations, a time interleaver time interleaving the mapped service data, a frame builder for building at least one signal frame including the time interleaved service data, a modulator for modulating data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter for transmitting the broadcast signals having the modulated data.