A communication system in which a constellation employing partially anti-symmetric amplitude labels is used to transmit probabilistically shaped amplitudes such that said amplitudes are also used to determine the signs applied thereto for transmission. In an example embodiment, a data transmitter is configured to use a suitable logic function (e.g., an XOR function) to place the parity generated by an FEC code into a selected amplitude bit while using the partially anti-symmetric amplitude labels to avoid placing the parity into the sign bits of the transmitted constellation symbols. In some embodiments, the FEC code can be a low-density parity-check code. Some embodiments are compatible with layered FEC coding, e.g., employing an outer FEC code and an inner FEC code. In some embodiments, FEC coding may be optional. Some embodiments can advantageously be used in communication systems relying on DMT modulation, such as the systems providing DSL access over copper wiring.

The wireless multiplexing using a tunable antenna provides a signal multiplexing technique that uses an electronically tunable antenna having a resonant frequency adjusted by tuning. An antenna tuning driver controls tuning of the tunable antenna and a signal selection circuit communicates signals selected in accordance with the antenna tuning driver, wherein the selection of the signals provides multiplexing. The technique allows separate communication with a set of stations operating at different communication frequencies as different communication links.

The wireless multiplexing using a tunable antenna provides a signal multiplexing technique that uses an electronically tunable antenna having a resonant frequency adjusted by tuning. An antenna tuning driver controls tuning of the tunable antenna and a signal selection circuit communicates signals selected in accordance with the antenna tuning driver, wherein the selection of the signals provides multiplexing. The technique allows separate communication with a set of stations operating at different communication frequencies as different communication links.

A method and apparatus provide for scheduling information for a downlink data channel. Scheduling information can be transmitted to a user equipment regarding a downlink data channel in a slot. The scheduling information can include information regarding at least a set of allocated subcarriers. The downlink data channel can require the user equipment to send an immediate hybrid automatic repeat request acknowledgement feedback within the slot. Downlink data can be transmitted using every x-th subcarrier among the allocated subcarriers in the last symbol of the downlink data channel.

A method and apparatus provide for scheduling information for a downlink data channel. Scheduling information can be transmitted to a user equipment regarding a downlink data channel in a slot. The scheduling information can include information regarding at least a set of allocated subcarriers. The downlink data channel can require the user equipment to send an immediate hybrid automatic repeat request acknowledgement feedback within the slot. Downlink data can be transmitted using every x-th subcarrier among the allocated subcarriers in the last symbol of the downlink data channel.

A DL control channel candidate can be decoded. A determination can be made for which DL OFDM symbol the decoded DL control channel candidate is received in. A determination can be made for a DL resource assignment from the decoded DL control channel candidate. Data can be received based on the DL resource assignment. A determination can be made for a time-frequency resource for transmitting a HARQ-ACK at least based on the determined DL OFDM symbol. The HARQ-ACK can be transmitted in the determined time-frequency resource. The transmitted HARQ-ACK can correspond to the received data.

A DL control channel candidate can be decoded. A determination can be made for which DL OFDM symbol the decoded DL control channel candidate is received in. A determination can be made for a DL resource assignment from the decoded DL control channel candidate. Data can be received based on the DL resource assignment. A determination can be made for a time-frequency resource for transmitting a HARQ-ACK at least based on the determined DL OFDM symbol. The HARQ-ACK can be transmitted in the determined time-frequency resource. The transmitted HARQ-ACK can correspond to the received data.

A method and device for dynamically allocating resources to a frequency band of a short transmission time interval (TTI) in a wireless communication system is provided. Specifically, a plurality of first downlink channels and a second downlink channel included in a subframe corresponding to one TTI are received, wherein the plurality of first downlink channels are received during sTTIs and the second downlink channel is received during the TTI. The plurality of first downlink channels are sequentially received. The plurality of first downlink channels are demodulated using control information included in a downlink control information (DCI) used for the second downlink channel and an RRC message. The control information and RRC message indicate frequency resources for the plurality of first downlink channels.

A method and device for dynamically allocating resources to a frequency band of a short transmission time interval (TTI) in a wireless communication system is provided. Specifically, a plurality of first downlink channels and a second downlink channel included in a subframe corresponding to one TTI are received, wherein the plurality of first downlink channels are received during sTTIs and the second downlink channel is received during the TTI. The plurality of first downlink channels are sequentially received. The plurality of first downlink channels are demodulated using control information included in a downlink control information (DCI) used for the second downlink channel and an RRC message. The control information and RRC message indicate frequency resources for the plurality of first downlink channels.

A filter includes two series arm resonators electrically connected in series between two input/output terminals, a parallel arm resonator electrically connected between a ground and a series arm between the two series arm resonators, an inductor electrically connected in parallel to the two series arm resonators, and a matching circuit electrically connected between one of the two series arm resonators and one of the input/output terminals, wherein the two series arm resonators and the parallel arm resonator define a pass band of a bandpass filter, the two series arm resonators and the inductor define an LC resonant circuit, respective anti-resonant frequencies of each of the two series arm resonators and a resonant frequency of the parallel arm resonator are located in a pass band of the LC resonant circuit, and a resonant frequency of the LC resonant circuit is lower than the resonant frequency of the parallel arm resonator.