Abstract: A receiver in a communication system is provided that includes a synchronization module and a channel estimator. The synchronization module is configured to identify an end of a cyclic prefix (CP) in a received signal using slope detection by monitoring a detection metric threshold in the received signal. The channel estimator is configured to estimate a complex noise variance using guard band subcarriers.

Abstract: For use in a wireless communication network, a transmitter is configured to encode information. The transmitter includes a cyclic redundancy check (CRC) encoder configured to encode a physical broadcast channel (PBCH) message using a cyclic redundancy check. The transmitter also includes a timing dependent cyclic shift block configured to encode information in the PBCH message. The transmitter further includes a quasi-cyclic low-density parity-check (QC-LDPC) encoder configured to encode the PBCH message using a QC-LDPC.

Abstract: A method constructs a family of low-density-parity-check (LDPC) codes. The method includes identifying a code rate for an LDPC code in the family, identifying a protograph for the LDPC code, and constructing a base matrix for the LDPC code. The base matrix is constructed by replacing each zero in the protograph with a ‘?1’, selecting a corresponding value for an absolute shift for each one in the protograph based on constraining a number of relative shifts per column of the LDPC code to one and increasing a size of a smallest cycle in a graph of the LDPC code, and replacing each one in the protograph with the corresponding value.

Abstract: To reduce the duration of a cyclic prefix used for a multiple input, multiple output (MIMO) communications channel, delay spread variations for different transmit/receive beam pair combination is estimated and used for fast beam switching and to support single user MIMO (SU-MIMO) even when the CP difference between two beams is large. Beam switching reference signals are employed to estimate delay spread exceeding current CP, and to support beam switching. CP covering sub-clusters within clusters for the MIMO channel are exploited to reduce the CP requirement and improve efficiency. Any one of a number of different CP durations may be selected for each different mobile station, using one of a finite set of subframe configurations for which the CP durations of different symbol locations within the subframe are predefined. Dynamically switching subframe configurations by the system accommodates high mobility.

Abstract: A low density parity check (LDPC) family of codes is constructed by: determining a protograph for a mother code for the LDPC family of codes. The protograph is lifted by a lifting factor to design code specific protograph for a code. The method also includes constructing a base matrix for the code. The base matrix is constructed by replacing each zero in the code specific protograph with a ‘?1’; and replacing each one in the code specific protograph with a corresponding value from the mother matrix. The LDPC code includes a codeword size of at least 1344, a plurality of information bits, and a plurality of parity bits. The LDPC code is based on a mother code of code length 672.

Abstract: A method and apparatus report or identify channel quality information. The method for reporting includes selecting one or more beams for channel quality reporting. The method also includes mapping, by the UE, indices of the one or more selected beams to one or more channel quality values. Additionally, the method includes sending channel quality information for the one or more selected beams according to the mapping. The method for identifying includes receiving an indication of indices of one or more beams selected for reporting. The method also includes receiving channel quality information for the one or more selected beams. The method further includes identifying a mapping of the indices of the one or more selected beams to one or more channel quality values. Additionally, the method includes identifying a channel quality value for each of the one or more selected beams according to the mapping.

Abstract: A mobile station is configured to scan cells in a wireless network. The mobile station includes at least one antenna configured to transmit and receive wireless signals. The mobile station also includes a processor coupled to the at least one antenna, the processor configured to scan for one or more neighboring base station cells in a same frequency band as a serving base station cell using one or more receive beams. The one or more receive beams used for scanning are different than receive beams used for data communication with the serving base station cell.

Abstract: Beam-steered millimeter wave signals transmitted in each of n sector slices include a sequence of primary synchronization (PSCH) symbols within predetermined symbol positions in at least one slot of a subframe. The symbols in consecutive symbol positions are each transmitted on a different one of the n slices, with the first symbol repeated on the same slice at the end. The sequence order rotates cyclically in each subframe so that two PSCH symbols are transmitted on one slice in a single subframe every nth subframe. Secondary synchronization (SSCH) and Broadcast Channel (BCH) symbols are transmitted in a predetermined pattern following the sequence of PSCH symbols. By transmitting consecutive PSCH symbols on different slices and repeating the first symbol, the mobile station can detect the best slice and beam by switching receive beams every subframe instead of every slot, relaxing time constraints on AGC adjustment while avoiding the start-at-the-edge problem.

Abstract: A family of low density parity check (LDPC) codes is generated based on a mother code having a highest code rate. The low density parity check (LDPC) codes include a codeword size of at least 1344. The LDPC codes also include a plurality of parity bits in a lower triangular form. The mother code is constructed by: selecting m number of rows and n number of columns; setting maximum column weights and row weights; designing a protograph matrix based on the set column weights and row weights and selected m and n; and selecting circulant blocks based on the protograph matrix.

Abstract: A transmitter is capable of performing both Galois Field (GF) (16) and GF (256) encoding in a visual light communication system. The transmitter includes a GF (256) encoder. The transmitter also includes a first bit mapper configured to map a first number of bits to a second number of bits. The Galois Field (256) encoder is configured to receive and encode the second number of bits. The transmitter also includes a second bit mapper configured to map the second number of bits to the first number of bits. The transmitter also includes an interleaver unit that can pad bits based on a frame size and puncture the bits after interleaving and prior to transmission.

Abstract: A low-density parity check (LDPC) decoder includes a memory configured to store multiple variable node LLR values in a LLR memory and multiple check nodes messages in a CN memory. The LDPC decoder also includes a saturation indicator configured to determine whether each check node of the H-matrix becomes saturated, and a multiplexer. The multiplexer is configured store an extrinsic check node value in the CN memory and updated LLR value in the LLR memory when the variable node is not saturated; and store a freeze input value in the CN memory and a freeze value in the LLR memory when the variable node is saturated.

Abstract: A method, apparatus, and system to transmit signals using multiple antennas with per-antenna power constraints. The method includes initializing a precoding algorithm to a complex matrix. The precoding algorithm is for precoding signals transmitted by a plurality of antennas. The method includes iteratively processing the precoding algorithm on a per-antenna basis by, at each iteration, sequentially updating a precoder for each of the plurality of antennas. The method includes, after each iteration, determining whether the precoding algorithm has converged based on a change in a rate of mutual information across iterations. Additionally, the method includes, in response to determining that the precoding algorithm has converged, transmitting the signals using the precoding algorithm.

Abstract: A method and apparatus enable combined baseband (BB) and radio frequency (RF) processing of signals. The method includes receiving, by a receiver, channel estimation information for a channel between a transmitter and the receiver. The method includes identifying a plurality of paths in the channel based on the channel estimation information. The method includes calculating an RF precoding matrix for precoding one or more signals to be transmitted on each of the identified paths. The RF precoding matrix includes a phase shift for each of the identified paths. Additionally, the method includes calculating a BB precoding matrix for precoding the one or more signals by a BB precoding unit associated with the transmitter.

Abstract: Systems and methods are disclosed for mapping reference signals for antenna ports in a plurality of resource blocks among resource blocks in a subframe within an orthogonal frequency division multiplexing (OFDM) communication system. This method includes selecting at least one predetermined resource elements for transmitting in the plurality of resource blocks using a first number of antenna ports. This method also includes selecting a second number of antenna ports and mapping a plurality of reference signals relating to the second number of antenna ports using a second number of OFDM symbols.

Abstract: A system and method for recovering erased symbols in a wireless communication is provided. The system and method includes a receiver configured to receive encoded data transmissions. The receiver includes a single stage decoder configured to perform a decoding operation. The single stage decoder also is configured to determine a symbol erasure rate, the symbol erasure rate defined by a number of erased symbols. The single stage decoder further is configured to generate a recovery matrix based on the symbol erasure rate and invert the recovery matrix. Thereafter, the single stage decoder recovers the erased symbols based on a function of the inverted recovery matrix.

Abstract: A system and method for encoding symbols in a wireless communication is provided. The system and method includes a transmitter configured to encode data transmissions. The transmitter includes a raptor encoder configured to perform a coding operation. The raptor encoder generates intermediate symbols without using a half-code such that the intermediate symbols consist of precoded symbols and parity symbols. Thereafter, the intermediate symbols are encoded using a Luby Transform to produce and output encoded symbols. The transmitter further is configured to transmit one or more of the source symbols, parity symbols or encoded symbols.

Abstract: A method constructs a family of low-density-parity-check (LDPC) codes. The method includes identifying a code rate for an LDPC code in the family, identifying a protograph for the LDPC code, and constructing a base matrix for the LDPC code. The base matrix is constructed by replacing each zero in the protograph with a ‘?1’, selecting a corresponding value for an absolute shift for each one in the protograph based on constraining a number of relative shifts per column of the LDPC code to one and increasing a size of a smallest cycle in a graph of the LDPC code, and replacing each one in the protograph with the corresponding value.

Abstract: For use in a wireless communication network, a transmitter is configured to encode information. The transmitter includes a cyclic redundancy check (CRC) encoder configured to encode a physical broadcast channel (PBCH) message using a cyclic redundancy check. The transmitter also includes a timing dependent cyclic shift block configured to encode information in the PBCH message. The transmitter further includes a quasi-cyclic low-density parity-check (QC-LDPC) encoder configured to encode the PBCH message using a QC-LDPC.

Abstract: A base station comprising an allocator configured to allocate a plurality of dedicated reference (DR) signals to selected resource elements. In the even-numbered time slot in a first resource block, a first group of DR signals are: i) allocated to a first group of adjacent resource elements; and ii) allocated to a second group of adjacent resource elements. In the contiguous odd-numbered time slot in the first resource block, the first group of DR signals are allocated to a third group of adjacent resource elements. In the even-numbered time slot in a second resource block, the first group of adjacent DR signals are allocated to a fourth group of resource elements. In the contiguous odd-numbered time slot in the second resource block, the first group of DR signals are: i) allocated to a fifth group of adjacent resource elements; and ii) allocated to a sixth group of adjacent resource elements.

Abstract: An apparatus and method decode LDPC code. The apparatus includes a memory and a number of LDPC processing elements. The memory is configured to receive a LDPC codeword having a length equal to a lifting factor times a base LDPC code length, wherein the lifting factor is greater than one. The number of LDPC processing elements configured to decode the LDPC codeword, wherein each of the number of LDPC processing elements decode separate portions of the LDPC codeword.