Various exemplary embodiments relate to a method for improving reception of transmissions with first adjacent interference signals, the method including selecting one or more time samples from each of two or more antennas; generating a lower first adjacent interference (LFAI) signal, a desired signal, and an upper first adjacent interference (UFAI) signal for each of the time samples; calculating a lower weighting co-efficient based on the LFAI signal; calculating a middle weighting co-efficient based on the desired signal; calculating a upper weighting co-efficient based on the UFAI signal; combining the lower weighting co-efficient with a filtered LFAI signal into a weighted lower signal; combining the middle weighting co-efficient with a filtered desired signal into a weighted middle signal; combining the upper weighting co-efficient with a filtered UFAI signal into a weighted upper signal; and combining the weighted lower signal, the weighted middle signal, and the weighted upper signal.

This disclosure describes systems, methods, computer readable media, and/or apparatus related to encoding wireless communication preamble structures with cyclic redundancy check (CRC) that is performed on both a common part, as well as, station specific parts of a signaling field. The signaling field generated by this mechanism may be relatively shorter, resulting in less preamble overhead, than if a separate CRC was to be provided for each of the station specific parts, as well as the common part of the signaling field. In additional embodiments, tail bits may be provided for a combination of the common part of the signaling field and each station specific part of the signaling field. Compared to providing tail bits separately for the common part and each of the station specific parts, removing the tail bits from the common part may result in relatively less overhead of the preamble structure.

Disclosed are a method for generating a pilot pattern and an apparatus thereof. The method for generating a pilot pattern for MIMO antennas includes: determining a size of a slot that is an interval where a pilot pattern is repeated in a time domain and a frequency domain; determining a pilot inserting position of OFDMA symbols included in a slot determined for a first antenna; and determining a pilot inserting position of OFDMA symbols included in a slot determined for a second antenna, in order to have a sub-carrier different from a sub-carrier of the pilot inserting position of the OFDMA symbols included in the slot determined for the first antenna.

This application provides a method for obtaining downlink channel information. The method includes: performing preceding weighting on M CSI-RSs of each of N sub-cycles, where each sub-cycle is a quantity of measurement pilot subframes for bearing and transmitting the M CSI-RSs; sending the M weighted CSI-RSs to UE; receiving M PMIs and M CQIs that are sent by the UE and that correspond to the M CSI-RSs, where the M PMIs and the M CQIs are obtained by the UE by separately measuring the M weighted CSI-RSs based on a set a rank 1 preceding codebooks corresponding to the predetermined antenna quantity; obtaining M signal-to-noise ratios of a downlink channel of the UE according to the M CQIs, obtaining M equivalent codebooks according to the M PMIs and weights of the preceding weighting; and obtaining a covariance matrix according to the M signal-to-noise ratios and the M equivalent codebooks.

This application provides a method for obtaining downlink channel information. The method includes: performing preceding weighting on M CSI-RSs of each of N sub-cycles, where each sub-cycle is a quantity of measurement pilot subframes for bearing and transmitting the M CSI-RSs; sending the M weighted CSI-RSs to UE; receiving M PMIs and M CQIs that are sent by the UE and that correspond to the M CSI-RSs, where the M PMIs and the M CQIs are obtained by the UE by separately measuring the M weighted CSI-RSs based on a set a rank 1 preceding codebooks corresponding to the predetermined antenna quantity; obtaining M signal-to-noise ratios of a downlink channel of the UE according to the M CQIs, obtaining M equivalent codebooks according to the M PMIs and weights of the preceding weighting; and obtaining a covariance matrix according to the M signal-to-noise ratios and the M equivalent codebooks.

An OFDM system uses a normal mode which has a symbol length T, a guard time TG and a set of N sub-carriers, which are orthogonal over the time T, and one or more fallback modes which have symbol lengths KT and guard times KTG where K is an integer greater than unity. The same set of N sub-carriers is used for the fallback modes as for the normal mode. Since the same set of sub-carriers is used, the overall bandwidth is substantially constant, so alias filtering does not need to be adaptive. The Fourier transform operations are the same as for the normal mode. Thus fallback modes are provided with little hardware cost. In the fallback modes the increased guard time provides better delay spread tolerance and the increased symbol length provides improved signal to noise performance, and thus increased range, at the cost of reduced data rate.

A method and an apparatus are provided for transmitting and receiving uplink data in a wireless communication system. A method includes transmitting first information on hopping, the first information on hopping indicating that one of inter-subframe hopping and intra-subframe hopping is configured; transmitting second information on hopping; determining whether mirroring is applied or not based on a packet transmission number, if the second information on hopping indicates that a predefined hopping pattern is enabled; identifying a resource for receiving the uplink data based on the determination as to whether the mirroring is applied or not; and receiving the uplink data using the identified resource.

A system and method are described for adjusting communication with a first distributed-input-distributed-output (DIDO) client as the first DIDO client moves from a first DIDO cluster to a second DIDO cluster: For example, in one embodiment of the system and method, different signal strength thresholds are specified and either conventional DIDO precoding and/or DIDO precoding with inter-DIDO-cluster interference (IDCI) cancellation to avoid RF interference at the DIDO client are employed based on measured signal strengths from a main DIDO cluster and an interfering DIDO cluster.

A communication device maps a plurality of bits to a first set of transmission symbols corresponding to a first set of subcarriers within a component communication channel. Transmission symbols among the first set of transmission symbols correspond to respective subsets of one or more bits, and transmission symbols among the first set of transmission symbols are single carrier transmission symbols. The communication device maps the plurality of bits to a second set of transmission symbols corresponding to a second set of subcarriers within the component communication channel. At least a subset of multiple transmission symbols in the second set of transmission symbols correspond to phase adjusted versions of transmission symbols in a corresponding at least a subset of multiple transmission symbols in the first set of transmission symbols. The communication device generates a transmission signal using the first set of transmission symbols and the second set of transmission symbols.

A method for reducing far-end crosstalk in a digital line system is provided. The method includes receiving a noise related value fed back from a first receiving end to a first transmitting end over a first line. The method further includes pre-coding, a first signal and crosstalk source signals according to values of filtering parameters to form a synthesized signal corresponding to the first line. The crosstalk source signals are related to second signals over a second line. The method further includes transmitting the synthesized signal from the first transmitting end to the first receiving end over the first line. A corresponding device for reducing far-end crosstalk in a digital line system is provided.