A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.

A method and structure for compensation techniques in coherent optical receivers. The present invention provides a coherent optical receiver with an improved 88 adaptive MIMO (Multiple Input, Multiple Output) equalizer configured within a digital signal processor (DSP) to compensate the effects of transmitter I/Q skew in subcarrier multiplexing (SCM) schemes. The 88 MIMO equalizer can be configured such that each of the 8 outputs is electrically coupled to 3 of 8 inputs, wherein each of the input-output couplings is configured as a filter. The method includes compensating for impairments to the digital conversion of an optical input signal via the 88 MIMO equalizer following other signal processing steps, such as chromatic dispersion (CD)/polarization-mode dispersion (PMD) compensation, carrier recovery, timing synchronization, and cycle slip correction.

A technique of separating a sequence of modulation shift keying (MSK) symbols into a first portion and a second portion and separately comparing the first portion of the sequence of MSK symbols and the second portion of the sequence of MSK symbols against a first portion of a reference sequence of MSK symbols and a second portion of the reference sequence of MSK symbols allows a low complexity detection of a start field delimiter in a wireless communication packet.

Coded antenna arrays and associated methods, apparatus and systems are disclosed. Signals transmitted by a client device are received at a plurality of antennas or antenna elements in an antenna array. The received signals are coded using codes such as orthogonal codes and pseudorandom number sequences under which the codes are selected to enable extraction of individual received signals. The coded signals are then combined to form a combined coded waveform that is processed using shared receiver circuitry. The shared receiver circuitry is configured to extract the signals received at each antenna using the codes used to code the received signals. Use of multiple client devices is also supported, with the receiver circuitry further configured to filter out signals received from individual client systems and calculate the phase and magnitude of the signals as received at each antenna. The signal phase and magnitude may be used for wireless transmission of power to clients by a wireless power transmission system.

Physical-layer security is provided by obfuscating or concealing the structure of the signal being transmitted, such that recovery of the underlying information is prohibitively expensive or even impossible. A digital filter implemented within a digital signal processor at the transmitter device introduces an obfuscation function. A digital filter implemented within a digital signal processor at the receiver device removes the obfuscation function. The obfuscation function conceals information bits to be conveyed by a modulated carrier signal. In some versions, the obfuscation function digitally modifies the phases of individual frequency components of the drive signals used to generate the modulated carrier signal. In other versions, the obfuscation function digitally modifies the phases and amplitudes of individual frequency components of the drive signals used to generate the modulated carrier signal.

A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.

A receiving method for receiving a plurality of carriers and generating one or a plurality of streams. The method includes a first demodulating step of processing a first transmission signal and generating a first demodulation output; a second demodulating step of processing a second transmission signal different from the first transmission signal and generating a second demodulation output; a combining step of generating one stream based on the first demodulation output and the second demodulation output; a selecting step of selecting one among the first demodulation output and the one stream, and generating a selected stream; and a back-end processing step of generating an output for a display from the selected stream and the second demodulation output. In the selecting step, the first demodulation output is selected in a receiving mode in single channel transmission, and the one stream is selected in a receiving mode in multiple channel transmission.

A base station for a mobile telecommunications system has circuitry configured to communicate with at least one user equipment, wherein the circuitry is further configured to set a first subcarrier spacing for transmission of at least one synchronization signal; and set a second subcarrier spacing for transmission on a physical broadcast channel, wherein the first subcarrier spacing differs from the second subcarrier spacing.

A base station for a mobile telecommunications system has circuitry configured to communicate with at least one user equipment, wherein the circuitry is further configured to set a first subcarrier spacing for transmission of at least one synchronization signal; and set a second subcarrier spacing for transmission on a physical broadcast channel, wherein the first subcarrier spacing differs from the second subcarrier spacing.

A symbol phase difference compensating portion (6) calculates a first phase difference which is a phase difference between a known pattern extracted from a received signal and a true value of the known pattern and performs phase compensation for the received signal based on the first phase difference. A tentative determination portion (12) tentatively determines an output signal of the symbol phase difference compensating portion (6) to acquire an estimated value of a phase. A first phase difference acquiring portion (13) acquires a second phase difference which is a phase difference between a phase of the output signal and the estimated value of the phase acquired by the tentative determination portion (12). A first phase difference compensating portion (14) performs phase compensation for the output signal based on the second phase difference.