Disclosed are a method and an apparatus for feeding back channel estimation in a MIMO system. A terminal receives a reference signal for estimating a channel from a base station; estimates the channel based on the reference signal; generates channel estimation information according to the channel estimation result and generates error information indicating an error of the channel estimation; and transmits feedback information including the channel estimation information and the error information to the base station.

The present technology relates to a wireless communication apparatus and method by which communication can be performed with a higher efficiency. The wireless communication apparatus includes a preamble generation section that generates a preamble that is to be deployed at the top of a transmission frame and includes header information, a midamble generation section that generates a midamble that is to be deployed in the middle of the transmission frame and includes information of at least part of the header information, and a wireless transmission processing section that transmits the transmission frame including the preamble and the midamble. The present technology can be applied to a wireless communication apparatus.

Various aspects of the present disclosure provide for methods, apparatus, and computer software for transmitting in-band control information in a wireless communication channel. A control and data information coding scheme is utilized to reduce the block error rate (BLER) of in-band control information in various scenarios. A subframe carries coded control information, coded data information, and coded control-data information for reducing the BLER of the in-band control information. The coded control information and coded data information are mix-coded to generate coded control-data information.

A method and a device for reducing a bit error rate in a Code Division Multiple Access (CDMA) communication system are described, wherein this method includes: a sample sequence I.sub.in of an in-phase component signal I, and a sample sequence Q.sub.in of a quadrature component signal Q are obtained, and the signals are sent by a signal sending end; the obtained sample sequence I.sub.in and the sample sequence Q.sub.in are divided into different groups according to a sample number Ns of a chip, a sum-average operation is performed on a signal in each group, and a corresponding signal group is determined, wherein, the signal group determined by performing the sum-average operation on the sample sequence I.sub.in is W.sub.I, the signal group determined by performing the sum-average operation on the sample sequence Q.sub.in is W.sub.Q; and a signal in the signal group W.sub.I and the signal group W.sub.Q is grouped to determine a signal belonging to the same chip in the sample sequence which experiences the sum-average operation, and the determined signal is output. The disclosure solves a problem in the related art that a CDMA synchronization method possesses a wrong sampling situation, which results in a high bit error rate of a receiving end, and reduces the bit error rate.

The present invention provides a method of transmitting broadcast signals. The method includes, encoding, by an encoder, PLP(Physical Layer Pipe) data; time interleaving, by a time interleaver, the encoded PLP data; frame mapping, by a framer, the time interleaved PLP data onto at least one signal frames; frequency interleaving, by a frequency interleaver, data in the at least one signal frames; and waveform modulating, by a waveform module, the frequency interleaved data in the at least one signal frame and transmitting, by the waveform module, broadcast signals having the modulated data, wherein the frequency interleaving is conducted according to an interleaving mode, wherein the interleaving mode is determined based on a FFT (Fast Fourier Transform) size.

A method of transmitting data by at least one access terminal (AT) in a wireless communication system is disclosed. More specifically, the method includes ceasing all transmissions by the at least one AT during a duration corresponding to a duration used by an access node (AN) to transmit a superframe preamble, wherein the superframe comprises a plurality of physical frames.

Systems and methods are described for reliably transmitting data in a network. The method includes: performing by a module, monitoring data from an output drive module for errors; and when an error is detected, generating a first signal based on the monitoring, and adjusting an input voltage to at least one of a pull-up resistor and a pull-down resistor for a predetermined time based on the first signal, to emphasize the error.

Disclosed is an apparatus for transmitting a broadcast signal including: an input formatter module configured to de-multiplex an input stream into at least one data pipe (DP); a BICM module configured to perform error correction on data of the at least one DP; a frame building module configured to generate a signal frame including the data of the DP; and an OFDM generation module configured to generate a transmission signal by inserting a preamble into the signal frame and performing OFDM modulation thereon.

An apparatus and method for synchronization of a decoding unit to a received data bit stream, DBS, encoded according to a data protocol, DP, said apparatus comprising a sampling unit adapted to sample a bit sequence, BSEQ, having a prede-termined bit sequence length, BSEQL, from the received data bit stream, DBS, and a checking unit configured to check whether at least one specific bit of the sampled bit sequence, BSEQ, fulfills a predetermined error detection condition, EDC, defined by said data protocol, DP, and further configured to synchronize the decoding unit to the received data bit stream, DBS, if the checking result is positive.

The method for transmitting an acknowledgement for enhanced physical downlink control channel (EPDCCH) by a terminal in a wireless communication system according to one embodiment of the present invention comprises: a step of receiving EPDCCH; and a step of determining a resource for transmitting the acknowledgement based on one or more of the values related to the enhanced control channel element (ECCE) index which is the lowest from among the indices of ECCEs used in the EPDCCH transmission, an antenna port index, and a predetermined value indicated by downlink control information. The transmitting acknowledgement method determines whether to use the predetermined value indicated by the downlink control information when the resource for transmitting the acknowledgement is determined, based on one or more of the transmitted EPDCCH type, the size of an DCI format, information related to the physical resource block (PRB) set of the transmitted EPDCCH, and the type of the signal transmitted on the PDSCH indicated by the EPDCCH.