In ultra-wideband or impulse radio terahertz wireless communication, the atmosphere reshapes terahertz pulses via group delay dispersion (GDD). Without correction, this can degrade the achievable data transmission rate. An apparatus comprising a stratified structure having a front end and a back end is disclosed. The structure comprises a plurality of adjacent layers of differing refractive indices, wherein each layer has a refractive index different from an immediately adjacent layer. The structure further includes a backing layer at the back end. The structure defines a GDD, which can be adjusted, and the structure is configured to introduce the GDD to a received terahertz signal and thereby produce a compensated terahertz signal when the received terahertz signal is reflected by the structure. The GDD of the structure is configured to substantially cancel out the GDD effects caused by the atmosphere on the terahertz signal.

A frequency synthesis device, including: a first generator configured to generate a periodical signal with a frequency f.sub.1; a second generator, coupled to the first generator and generating from the signal with a frequency f.sub.1 a signal S.sub.G corresponding to a train of oscillations with a frequency substantially equal to N.Math.f.sub.1, with a duration lower than T.sub.1=1/f.sub.1 and periodically repeated at the frequency f.sub.1; a third generator generating, from the signal S.sub.G, m periodical signals S.sub.LO.sub._.sub.CH1 to S.sub.LO.sub._.sub.CHm with frequency spectra each include a main line with a frequency f.sub.LO.sub._.sub.CHi corresponding to an integer multiple of f.sub.1, with 1≦i≦m, the third generator operating as a band-pass filter applied to the signal S.sub.G and discarding from the frequency spectra of each of the periodical signals S.sub.LO.sub._.sub.CH1 to S.sub.LO.sub._.sub.CHm lines other than the main line with a frequency f.sub.LO.sub._.sub.CHi.

Nyquist folding receivers (NYFRs) are disclosed that use three or more non-modulated sampling clock signals with different frequencies to produce multiple projections in a sampled output. Using these three or more different sampling clock signals, multiple Nyquist zones are aliased together while still allowing signals from different Nyquist zones to be separated and identified in later processing based upon the sampling provided by the different sampling clock signals. NYFR sampling receivers are also disclosed that simultaneously produce multiple separate and different parallel channels from an input signal, with each different channel having a different sampling clock sampling rate from the other channels so as to generate a respective folding pattern that is different from the folding pattern generated by the respective RF sampling rate of each of the other simultaneous and parallel channels. A particular signal may be separated and identified by matching it to the respective different folding patterns in each of the simultaneous multiple different parallel channels.

A pulse generator comprising: a first signal generating arm comprising a first inductor and a plurality of switching elements, each arranged to draw current through the first inductor; and a controller arranged to activate the plurality of switching elements in a predetermined sequence so as to generate a predetermined pulse waveform at a pulse generator output. The switching elements of the signal generating arm and the inductor together form a pulse synthesizer that takes the signal from the controller and uses it to synthesize an output pulse. Compared with conventional transmitter architectures, the functions of the upconversion mixer, the DAC, and the power amplifier are all performed by a single simplified circuit. This is both area efficient and power efficient.

An impulse radio (IR) ultra-wide band (UWB) transceiver adapted for a rake receiver is provided herein. This may be implemented as follows: on the transmitter side, the input data is converted to N-parallel streams having different delays, each stream is transmitted by an impulse radio signal with defined different carrier frequency. On the receiver side, the multicarrier RF signal is converted into base band signal, emulating multipath channels, so that rake receiver technique is used for an optimal demodulation of the received signal.

An apparatus for communication in a wireless communication network comprises a coder that encodes a set of data symbols to produce a set of coded symbols; a modulator that modulates the coded symbols onto a set of subcarrier frequencies to generate a time-domain signal comprising a sum of a set of modulated pulse waveforms; and a transmitter configured for transmitting the time-domain signal in the wireless communication network. The coder employs a matrix of spreading codes, wherein each column of the matrix multiplies a different one of the data symbols, which causes the modulator to produce a corresponding one of the set of modulated pulse waveforms. Each column of the matrix of spreading codes comprises a set of linearly increasing phases, which provides a time offset to the corresponding modulated pulse waveforms.

Systems and methods for operating a communication device. The methods comprise: receiving a carrier signal modulated with a modulation signal comprising a symbol conveyed in a symbol timing window; determining an energy value for each timeslot in the symbol timing window; combining the energy values to determine a combined energy value for each bit of the symbol in a manner in which the combined energy value is penalized if more than one timeslot of the symbol timing window comprises energy contained in the carrier signal; and generating a soft value for each bit of the sequence of bits by combining the combined energy value with a weight value, where the weight value is selected from a plurality of weight values based on a number of timeslots in the symbol timing window which comprises energy contained in the carrier signal.

In an electronic device and an operation method thereof according to certain embodiments, the electronic device may include: a first communication circuit configured to perform a first communication using an ultra-wide band (UWB) communication scheme and a processor. The processor may control the communication circuit to: identify, based on a characteristic of data to be transmitted using the first communication circuit, a frame length of the data to be transmitted; determine, based on the identified frame length, a peak voltage of a signal containing the data to be transmitted; and transmit the data using the signal having the determined peak voltage.

A system for pulse based wideband signaling comprises a transmitter that performs physical layer encoding of both digital and analog data into a pulse repetition rate signal, and modulation of the pulse repetition rate signal into wideband radio frequency pulses, and transmission of the pulses as a wideband RF signal, a receiver that performs physical layer demodulation of the wideband RF signal into a pulse repetition rate signal, and decoding of the pulse repetition rate signal into digital and analog data, wherein the system provides improvement in controlling and balancing the variables of bandwidth, signal to noise ratio, range, and power consumption.

A user device communicates in a wireless network by encoding a set of data symbols with a set of complex-valued codes to produce a set of subcarrier values. The subcarrier values are modulated onto a set of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers assigned to the user device to produce a time-domain waveform that comprises a superposition of modulated subcarriers, and the time-domain waveform is transmitted in the wireless network. The set of subcarrier values comprises a first polyphase code that encodes a first of the set of data symbols and at least a second polyphase code that encodes at least a second of the set of data symbols. The first polyphase code causes constructive and destructive interference between the modulated subcarriers to produce a first periodic pulse waveform having a peak value centered at a first time in an OFDM symbol interval, and the second polyphase code causes constructive and destructive interference between the modulated subcarriers to produce a second periodic pulse waveform having a peak value centered at a second time in the OFDM symbol interval, wherein the second time is different from the first time.