Abstract: A method for operating a Viterbi decoder uses few data move operations to improve efficiency. The Viterbi decoder predicts a state in which the convolution encoder might have operated while generating a convolutionally encoded data stream. The Viterbi decoder maintains a first set of states and based on the received convolutionally encoded data stream, predicts second and third sets of states. The Viterbi decoder then calculates first and second sets of decision bits based on the transitions to the second and third sets of states. Path metric values associated with the third set of states are stored in a memory buffer. Thereafter, during trace-back, the Viterbi decoder extracts first and second decoded bits from first and second sets of decision bits respectively.

Abstract: In order to reduce power consumption while an incoming call is detected by each of a plurality of communication methods, a mobile phone includes a radio circuit, a wireless LAN circuit, and a control portion to control power supply to them. The control portion cuts off power supply to the radio circuit when communication for a call by the wireless LAN circuit is established when power is supplied to both the radio circuit and the wireless LAN circuit.

Abstract: A method of transmitting data blocks between a user equipment and a station using parallel hybrid automatic repeat request processes. The station includes a scheduler that signals to the user equipment allocations of resources and parameters for transmission and re-transmission of the data blocks, and a set of reception buffers that receive and re-order the data blocks. The scheduler assigns a reception index to the corresponding scheduled reception and assigns reception buffers to received data blocks as a function of the assigned reception indexes identifying time slots scheduled for reception. A newly transmitted data block received in its scheduled time slot is assigned to the reception buffer corresponding to a new reception index. A re-transmitted data block received in a time slot later than its originally scheduled time slot is assigned to the reception buffer corresponding to a same reception index as its originally scheduled reception.

Abstract: A loss correction encoding device having an improved capability of loss correction using LDPC-CC includes a rearranging unit that rearranges information data contained in n information packets according to the constraint length Kmax and the encoding rate (q?1)/q of a check polynomial of the loss correction code used in a loss correction encoding unit. Specifically, the rearranging unit rearranges the information data in such a way that continuous Kmax×(q?1) pieces of information data after rearrangement are contained in different information packets. The rearranging unit distributes the information data to information blocks from n information packets, where n satisfies the formula Kmax×(q?1)?n.

Abstract: To suppress deterioration of retransmission efficiency and retransmit a transmission signal efficiently even when the system bandwidth is extended, provided are a base station apparatus (20) which divides, in a retransmission block dividing section (21), a transmission signal into retransmission blocks according to a retransmission block table in which the number of the retransmission blocks each of which is a retransmission unit of a transmission signal is increased corresponding to the number of transmission antennas and registered, and retransmits in downlink transmission signals associated with the divided retransmission blocks, and a mobile terminal apparatus (10) which receives the transmission signals associated with the retransmission blocks from the base station apparatus (20), and combines the retransmission blocks to restore the transmission signal prior to division.

Abstract: A method for data communication between a base station and at least one transponder by a high-frequency electromagnetic carrier signal is disclosed, onto which information packets are modulated, whereby each information packet has a header section, a middle section, and an end section and whereby the middle section has a data field for the transmission of data and/or address information and a protection field placed thereafter for the correction of errors in the transmission of the data and/or address information, whereby after the data field the base station inserts at least one control field, by which the protection field following the inserted control field can be changed in such a way that the duration of an information packet is set variably. The invention relates further to a base station for carrying out this method, to a data communication system containing a base station and at least one transponder in communicative wireless contact with the base station.

Abstract: This invention proposes an automatic retransmission controller and a retransmission block recombination apparatus, of which the automatic retransmission controller comprises a responsive reception unit that receives the information fed back from the receiver; a retransmission judging unit that determines coded data blocks to be retransmitted according to the information received by the responsive reception unit; and a data acquisition unit that acquires a part of data in each of the coded data blocks to be retransmitted judged by the retransmission judging unit for recombination to form a retransmission coded block, when the number of the coded data blocks to be transmitted is more than one.

Abstract: An error correction method and device and a communication system using them, including an LDPC code generation method capable of adjusting an encoding rate of an LDPC code in a variable manner while leaving the length of the code constant by use of an efficient encoding method or mechanism supporting a variable encoding rate, so that the encoding rate of the LDPC code can be adjusted without changing the code length. An error correction method includes a row dividing to divide each of a part or all of rows into two or more rows based on one parity check matrix, and a code construction to construct a plurality of LDPC codes with arbitrary code rates, respectively.

Abstract: A method begins with a processing module determining that storage of data requires updating, wherein the data is stored as a plurality of sets of encoded data slices in DSN memory. For a first type of updating, the processing module increases the total number while maintaining the decode threshold number. The processing module then, for each set of encoded data slices, creates another encoded data slice in accordance with the dispersed storage error encoding function and the increased total number and sends the new encoded data slices to the DSN memory. For a second type of updating, the processing module increases the total number and the decode threshold number. The processing module then recovers the data and encodes it in accordance with the dispersed storage error encoding function using the increased total number and the increased decode threshold number to produce an updated plurality of sets of encoded data slices.

Abstract: A wireless communication apparatus that uses a communication protocol to transmit and receive data with a data check bit, including a received data determining section that performs a data check for received data by using the data check bit to determine whether the data is error; a received result transmitting section that, when determined to be error, discards the data and transmits a retransmission request to other wireless communication apparatus of the transmitting origin, whereas determined to be not error, transmits a message indicating that the data is normal to the other wireless communication apparatus of the transmitting origin; and a retransmission asking section that determines whether a format of the data is incorrect or normal, and when determined to be normal, passes the data to predetermined processing, whereas when determined to be incorrect, discards the data and asks the received result transmitting section to request retransmission of the data.

Abstract: A processor including: a first storage unit that stores data; an error detection unit that detects an occurrence of error in data read out from the first storage unit; a second storage unit that stores data read out from the first storage unit based on a load request; a rerun request generation unit that generates a rerun request of a load request to the first storage unit in the same cycle as the cycle in which error of data is detected when the error detection unit detects the occurrence of error in data read out from the first storage unit by the load request; and an instruction execution unit that retransmits the load request to the first storage unit when data in which error is detected and a rerun request are given.

Abstract: Disclosed are a method and an apparatus for transmitting and receiving broadcast data in a digital broadcasting system. The method for transmitting and receiving broadcast data in a digital broadcasting system includes receiving the main data encoded with symbols having a plurality of levels; deciding whether levels of main data symbols encoded with symbols having the plurality of levels belong to a first group; and mapping the main data symbols to extended levels by using modulation values of the additional data if it is decided that the levels of the main data symbols belong to the first group.

Abstract: A source application reads a body of data in data block sized units and calculates a checksum value for each data block before sending the data block, the calculated checksum value and the identifier. Upon receipt, a destination application independently calculates a checksum value for each received data block and compares the two checksums. Non-matching checksums indicate a network-induced error in the data block. Identifiers for the erroneous data blocks are transmitted to the source application after all of the data blocks have been initially transmitted. The source application thereafter resends only those data blocks identified. The destination application repeats the process of comparing checksums and transmitting identifiers to the source application until all of the data blocks of the body of data have been correctly received, and then uses the data blocks to recreate the body of data.

Abstract: A data transfer device, including a packet receiving unit to receive packets in a block including a data packet and an error-correction packet; a packet-loss detection unit to detect a packet loss from a head of a block received by the packet receiving unit of a received packet; a packet transfer unit to transfer the packet received from the packet receiving unit with a delay of a predetermined time; and a retransmission-request transmission unit to transmit a retransmission request to a packet-transmission source device based on the packet loss detected by the packet-loss detection unit and a determined retransmission time to retransmit the packet.

Abstract: A wireless device for implementing Incremental Redundancy (IR) operations includes system processing circuitry operable to perform Physical (PHY) layer operations, Media Access Control (MAC) layer operations and Radio Link Control (RLC) operations of the wireless device. The system processing circuitry further includes an IR control module for processing IR transactions related to a received RLC data block and for tracking an Automatic Repeat Request (ARQ) receiving state and received block bit map and a Layer 1 (L1) module for intercepting and diverting the IR transactions to the IR control module and for passing a correctly decoded RLC data block to the RLC layer operations via the MAC layer operations thereby automatically synchronizing the RLC layer operations. An IR processing module is coupled to the system processing circuitry to perform IR operations on the received RLC data block based upon a direction from the IR control module.

Abstract: The present invention relates to a method and system for efficient error free packet reception using hybrid automatic repeat-request (HARQ) in a wireless communication system. In one embodiment this is accomplished by receiving in a plurality of modulated digital data as transmission signal at a receiver transmitted through a plurality of transmission paths from a transmitter, demodulating the received transmission signals, estimating the difference between the received transmission signals and the ideal expected signal constellation in order to determine the weights for each constellation symbols, applying the determined weights for each symbol-wise of the received transmission data, storing the weighted data as final data in a buffer of a HARQ combining unit and processing the stored final data to determine whether the received data frames are correct.

Abstract: Systems and methods for processing and decoding TCM/BCM-coded signal vectors. A multi-dimensional signal vector is received by, for example, a TCM or BCM decoder. The TCM/BCM decoder identifies the closest signal points in the signal constellation set, or “nearest neighbors,” for each dimension of the received signal vector. The TCM/BCM decoder then forms a test set that includes a plurality of multi-dimensional test vectors, where each dimension of each test vector is based on an identified nearest neighbor. In particular, each test point in the test set is based on a different combination of the nearest neighbors. The TCM/BCM decoder can compute branch metrics based on only the test points in the test set, and can make detection decisions using the computed branch metrics.

Abstract: Problem: A packet error rate in a receiver needs to be effectively reduced. Solution to Problem: A transmitter 11 inserts error detection codes into information packets on one-to-one basis, at a certain layer at which signal processing is performed earlier than at a physical layer, to obtain first information packets. The transmitter 11 codes the first information packets at the physical layer to obtain second information packets, and transmits the second information packets. At the certain layer, the transmitter 11 generates parity packets by coding the information packets and inserts the error detection codes into the parity packets on one-to-one basis to obtain first parity packets. The transmitter codes the first parity packets at the physical layer to obtain second parity packets. The transmitter 11 transmits the second parity packets in accordance with a transmission request from each of one or more receivers.

Abstract: Through the identification of different packet-types, packets can be handled based on an assigned packet handling identifier. This identifier can, for example, enable forwarding of latency-sensitive packets without delay and allow error-sensitive packets to be stored for possible retransmission. In another embodiment, and optionally in conjunction with retransmission protocols including a packet handling identifier, a memory used for retransmission of packets can be shared with other transceiver functionality such as, coding, decoding, interleaving, deinterleaving, error correction, and the like.

Abstract: Systems and techniques relating to wireless communications are described. A described technique includes receiving signals representing wireless data transmissions that are based on a symbol, the received signals including one or more first signals and a second signal, where a decoded version of the one or more first signals previously failed to successfully resolve the symbol. The second signal can be transmitted in response to the one or more first signals failing to successfully resolve the symbol. The technique includes determining the symbol based on the received signals, where the determining places more significance to the second signal than the one or more first signals.

Abstract: A method and apparatus may be used for supporting multiple hybrid automatic repeat request (H-ARQ) processes per transmission time interval (TTI). A transmitter and a receiver may include a plurality of H-ARQ processes. Each H-ARQ process may transmit and receive one TB per TTI. The transmitter may generate a plurality of TBs and assign each TB to a H-ARQ process. The transmitter may send control information for each TB, which may include H-ARQ information associated TBs with the TBs. The transmitter may send the TBs using the associated H-ARQ processes simultaneously per TTI. After receiving the TBs, the receiver may send feedback for each of the H-ARQ processes and associated TBs indicating successful or unsuccessful receipt of each of the TBs to the transmitter. The feedback for multiple TBs may be combined for the simultaneously transmitted H-ARQ processes, (i.e., TBs). When MIMO is implemented, one H-ARQ process may be associated with one MIMO stream, or codeword.

Abstract: To realize prompt and efficient data communication by dynamically changing the optimum MCS and PC. A base station (120) serving as a wireless communication device according to the present invention includes an obtaining unit (220) for obtaining an RSSI and an SINR of a receive signal upon generation of transmission data to be sent to a PHS terminal (110) serving as a wireless communication device to communicate with; a modulation and coding scheme determining unit (224) for determining an MCS, based on the volume of the transmission data; a transmission power determining unit (226) for determining a transmission power, based on the volume of the transmission data, the RSSI, the SINR, and the MCS determined; and a wireless communication unit (214) for sending the transmission data, using the MCS determined and the transmission power determined.

Abstract: Embodiments disclosed herein address the need in the art for enhanced block acknowledgement. In one embodiment, a receiver indicates a decoding delay for a maximum size aggregate frame in Block Ack negotiation, which may be used by a transmitter to determine to which Block Ack Request a Block Acknowledgement is responsive. In another embodiment, a Transmission Sequence Number (TSN) may be included in a Block Ack Request. The receiver includes the TSN in the corresponding Block Ack response. This allows the transmitter to determine which frames are “in transit.” The TSN may be used to identify blocks. In another embodiment, a TSN may be associated with one or more transmitted frames. While, the TSN is not transmitted with the Block Ack Request, the transmitter may determine which TSN corresponds with a Block Ack response in accordance with acknowledgements contained therein. Combinations of these techniques may be deployed. Various other aspects are also presented.

Abstract: Techniques to support low density parity check (LDPC) encoding and decoding are described. An apparatus includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to encode or decode a packet based on a base parity check matrix and a set of lifting values. In a particular embodiment, the set of lifting values is limited to lifting values that are each a different power of two. The memory is configured to store parameters associated with the base parity check matrix.

Abstract: A data link layer tunneling technique improves the throughput of high speed data in noisy wireless environments. Recovering lost frames transmitted between a packet sending unit and a packet receiving unit in a data communications system generally comprises (a) identifying a failure to successfully receive a missed frame at the packet receiving unit; (b) establishing a logical tunnel channel at the packet receiving unit to acknowledge the next successfully received frame; (c) starting a first timer at the packet receiving unit; (c) upon receiving a tunnel establishment request from the packet receiving unit, the packet sending unit resending the missed frame on the logical tunnel channel and starting a second timer; and (d) the packet sending unit resending the missed frame a specified number of times until receiving an acknowledgement from the packet receiving unit.

Abstract: A method and device for handling hybrid automatic repeat request (‘HARQ’) operations during transmission mode changes, the method detecting a transmission mode change; and manipulating an HARQ process buffer based on the detecting. Further, a method and network element for handling hybrid automatic repeat request (‘HARQ’) operations during transmission mode changes, the method checking when a user equipment is in a transmission mode uncertainty window; and blocking communications to the user equipment or utilizing a downlink control information format 1A for communications to the user equipment.

Abstract: Techniques for controlling synchronous HARQ retransmissions are disclosed, in which non-adaptive retransmissions scheduled for a first transmission time interval are automatically deferred to a later transmission time interval in the event that a control message prohibiting the retransmission during the first transmission interval is received. In an exemplary method, a NACK message is received (320) in response to a previous data transmission corresponding to a stop-and-wait HARQ process, and a synchronous HARQ retransmission is scheduled (330) for a first transmission interval in response. A control message indicating that data for the stop-and-wait HARQ process may not be sent during the first transmission interval is received, and the synchronous HARQ retransmission is automatically deferred (350) to a second transmission interval, responsive to the control message. An explicit grant is not required to trigger the retransmission during the second transmission interval.

Abstract: A method and apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed are disclosed. A sequence may be generated from a temporary flow identity (TFI) to which the PAN field is addressed and masked with a PAN check sequence (PCS). A radio block including a PAN field and a masked PCS is transmitted. The PCS may be masked with one of TFIs which is selected in accordance with a rule pre-agreed. A secondary identifier may indicate a TBF to which the PAN field is addressed. A special value may be used to represent all TBFs assigned and a secondary identifier may indicate a TBF to which the PAN field is addressed. A special value on the PAN field may be used for control purposes for indicating an action affecting a group of receiving stations listening to the radio block.

Abstract: A transmitting apparatus for transmitting user data, includes: an establishing section that establishes three or more transmission paths for a receiving apparatus; a first generation section that generates a user data unit which includes user data to be transmitted to the receiving apparatus; and a second generation section that generates an error correction data unit which includes error correction data to be used for error correction of the user data to be transmitted to the receiving apparatus. At least one of the three or more transmission paths transmits the error correction data unit, and at least two of the three or more transmission paths transmits the user data unit.

Abstract: An error pattern analysis unit specifies positions of discarded packets in continuously transmitted groups of packets. A QoS control unit estimates the cause of a communication error based on the specified positions of discarded packets, and performs QoS control based on the estimated cause of the communication error.

Abstract: An embodiment of a method for transmitting data through at least a channel in a wireless communication system, the method comprising at least the steps of: encoding the data by performing a forward-error-correction encoding, forming a sequence of symbols from the encoded data, forming an M-by-T coding matrix from said sequence of symbols, each column of the coding matrix comprising N different symbols of the sequence of symbols and M?N zeros, N being an integer equal at least to one, T representing the number of consecutive transmission intervals, M representing the total number of transmit antennas, and using the coding matrix for transmitting the sequence of symbols during the T consecutive transmission intervals, by transmitting one different column of the coding matrix at each transmission interval through the M transmit antennas, only N transmit antennas are enabled during a given transmission interval.

Abstract: A system and method for transmitting and receiving acknowledgement information are provided. A method for communications device operations includes determining a hybrid automatic repeat request (HARQ) response for each CC in a set of configured CCs, thereby producing a set of HARQ responses, generating an information vector from the set of HARQ responses, encoding the information vector, and transmitting the encoded information vector. A sub-vector of one or more bits selected from the information vector is assigned a fixed vector value independent of HARQ responses for CCs not in a set of CCs when the set of CCs is not empty, where the set of CCs comprises at least one CC whose HARQ response is equal to DTX.

Abstract: The invention relates to a method for allocating radio resources to a mobile terminal for data transmission in a mobile communication system as performed by a mobile terminal and a base station, respectively. Moreover, the invention relates to a mobile terminal and a base station to perform such method, as well as an implementation of the method in software. The invention further provides a mobile communication system in which radio resources are allocated to a mobile terminal for uplink transmission. In order to avoid false activation of a semi-persistent resource allocation the invention defines new conditions under which a mobile terminal activates a semi-persistent resource allocation. Unlike for example in prior-art systems, a mobile terminal only activates a semi-persistent resource allocation, if it can confirm the activation command received from the access network. Preferably, the activation command and its confirmation are resource assignments.

Abstract: Different transmissions based on different content blocks which were segmented from the same digital content according to different segmentation schemes, where each of the content blocks has any substring in common with at least one of the other content blocks, are received by a receiving radio communication station, for example a mobile telephone or a mobile network base station. Certain encoded received bits derived from different ones of the transmissions are combined into combined bits. Other encoded received bits derived from one or more of the different transmissions are provided together with the combined bits to a decoder.

Abstract: A “Media Transmission Optimizer” provides a media transmission optimization framework for lossy or bursty networks such as the Internet. This optimization framework provides a novel form of dynamic Forward Error Correction (FEC) that focuses on the perceived quality of a recovered media signal rather than on the absolute accuracy of the recovered media signal. In general, the Media Transmission Optimizer provides an encoder that optimizes the transmission of redundant frames of electronic media information encoded at different bit rates, and provides optimized playback quality by providing a decoder that automatically selects an optimal path through one or more available representations of each frame as a function of overall rate/distortion criteria.

Abstract: Disclosed are various embodiments that provide turbo decoding implemented as at least a portion of baseband processing circuitry. An input bit stream may be divided into a set of code blocks and a first code block may be separated from the set of code blocks. A hybrid automatic repeat request (HARQ) process is performed on the first code block to generate a processed first code block. The processed first code block is stored in an incremental redundancy (IR) buffer. A turbo decoding process is performed on the processed first code block to generate decoded first code block data and the decoded first code block data is stored in an external memory. The processed first code block is removed from the IR buffer for decoding a remaining portion of the set of code blocks.

Abstract: Techniques for decoding levels in non-volatile memory. A level of a cell in a multi-bit non-volatile memory is read. A minimum of Log-Likelihood Ratio (LLR) and a modified LLR to decode the level, wherein the modified LLR is a function of a misplacement probability is used. A value corresponding the decoded level is written to a volatile memory.

Abstract: A method for reporting uplink control information (UCI) on a user equipment (UE) is described. It is determined a number of bits in a sequence of bits for transmission is greater than 11 and less than or equal to 21. The sequence of bits for transmission is segmented into a first segment and a second segment using a floor function. The first segment is encoded using a first Reed-Muller encoder. The second segment is encoded using a second Reed-Muller encoder.

Abstract: An embodiment of the present invention provides a method of efficiently storing metrics for Hybrid Automatic Retransmission Request (HARQ) combining and enabling saving of memory buffer in communication systems, comprising using non-linear quantization of the metrics and managing an aggregated buffer for all HARQ channels.

Abstract: A method and arrangement for retransmission control. A method in a sending system entity for controlling retransmissions of data to a sending system entity is provided. Initial data encoded with a first forward error correction code is sent 200 to the receiving system entity. When transmitted initial data is determined to be affected by errors at the receiving system entity, the sending system entity receives 202 a request to retransmit the initial data combined 204 by new data encoded with a second forward error correction code in a combined data stream which is encoded 206 with a third forward error correction code before being sent 208 to the receiving system entity. By combining initial data and encoded new data in a combined data stream when resending, an effective and flexible procedure for retransmissions is achieved, which doesn't introduce any substantial delay of the data.

Abstract: In a symbol mapping method, transmission data is encoded to generate information bits and redundancy bits. An average LLR value of bits on which the information bits are mapped is different from an average LLR value of bits on which the redundancy bits are mapped.

Abstract: Methods and systems for doped rateless retransmission include receiving ratelessly coded symbols. An attempt is made to decode the coded symbols using a processor by creating an associated code graph that represents the structure of the rateless code used by the symbols. If the decoding attempt fails, an input node is selected from the code graph using a metric that gauges the number and degree of connections to the input node based on the code graph structure. The selected input node is then requested for retransmission of the selected input node by a feedback channel.

Abstract: An apparatus and method of transmitting ACK/NACK (acknowledgement/negative ACK) information in downlink and an apparatus and method of receiving the ACK/NACK information are disclosed. The present invention configures ACK/NACK information on multiple UL codeword transmission using a PHICH and at least one NDI, whereby the ACK/NACK information on the multiple UL codeword transmission is transmitted to a user equipment without additional PHICH resource allocation. The present invention extends the conventional HI codeword and/or arranged position on a signal constellation, thereby transmitting ACK/NACK information on multiple UL codeword transmission to a user equipment without additional PHICH resource allocation.

Abstract: A system and method for mapping and decoding codewords in acknowledgement information communications are provided. A method for communications device operations includes determining a hybrid automatic repeat request (HARQ) response for each component carrier (CC) in a set of configured CCs, thereby producing a set of HARQ responses, generating an information vector from the set of HARQ responses, encoding the information vector based on a (n, k) linear block code corresponding to the set of configured CCs, and transmitting the encoded information vector. A unique set of bits selected from the information vector is assigned to represent a HARQ response for each different CC in the set of configured CCs. The (n, k) linear block code is obtained by a linear transformation of an original (n, k) linear block code, where n is a length of code words, and k is a length of information vectors.

Abstract: A transmitting unit divides a transmit data into a plurality of code blocks, and encodes each of the plurality of code blocks to generate a transmission signal. The transmitting unit transmits the transmission signal, and a receiving unit receives the transmission signal as a reception signal. The receiving unit receives performs an iterative decoding to each of the plurality of code blocks of the reception signal. The iterative decoding is terminated to a first code block group in which an error has not been detected before a first setting iteration count. The receiving unit, when being an error in the reception signal, transmits a retransmission request feedback data which contains a NACK data and a data indicating the first code block group to the transmitting unit. First resources are assigned for each of the plurality of code blocks of the transmission signal.

Abstract: An embodiment of the invention includes an efficient error-control system and method for recovering packet losses, especially losses in distributing multicast video over broadband residential networks. Preferably, unlike most existing error-control algorithms designed for Internet multicast, the system and method does not employ substantial feedback suppression. Preferably, the system and method does not employ substantial multicasted retransmission. Preferably, the system and method does not employ substantial parity retransmission. Preferably, the system and method does not employ substantial local loss recovery. The system and method integrates two existing classes of error-control algorithms: Automatic Repeat Request (ARQ) and Forward Error Correction (FEC), to reduce traffic overhead and achieve scalability.

Abstract: Methods and apparatus for FEC frame header detection are provided, suitable for use in a DVB-C2 receiver. A first method comprises demodulating with a quadrature phase shift keying (QPSK) demapper, followed by correlation and symmetry measures for detection of a robust FEC header. A second method comprises demodulating with a 16 quadrature amplitude modulation (QAM) demapper, followed by correlation and symmetry measures for detection of a high efficiency FEC leader. Another embodiment comprises using both the first and second methods to find the FEC header because the first symbol of the FEC frame header may be sent either in robust mode or in high efficiency mode. There is also provided a method and apparatus for generating an alternate decision statistic for determining detection of the FEC frame header.

Abstract: Hybrid Automatic Repeat Request (HARQ) is implemented using multi-bit feedback and variable retransmission energy. The multi-bit feedback provides information to the transmitter about the state of the decoder so that the transmitter can adapt retransmissions to the current state of the decoder. In some embodiments, the multi-bit feedback indicates a level of convergence reached by the decoder, and the transmitter varies an amount of energy used for the retransmission as a function of the multi-bit feedback. The transmitter can vary the amount of energy applied to the retransmission by varying the number of bits in the retransmission, or by varying a transmit power used for the retransmission.

Abstract: A method and apparatus for transmitting a packet from a transmitter entity to a receiver entity in a wireless communication system are disclosed. A transmitting entity includes a radio link control (RLC) sublayer and lower layers including a medium access control (MAC) sublayer and a physical layer, where the RLC sublayer provides a protocol data unit (PDU) to the lower layers for transmission. The lower layers using a HARQ entity transmit the PDU to the receiving entity. The RLC sublayer in the transmitting entity, without an indication from an RLC sublayer of the receiving entity, provides the PDU in response to an indication from the lower layers for retransmission.

Abstract: In a multicarrier wireless communication system adopting forward error correction codes, a reception method adapted to a receiver 1 receiving wireless signals is constituted of an interference band detection process for selecting a sub-carrier having low reliability among a plurality of sub-carriers of desired waves as a specific sub-carrier, a weight coefficient generation process for generating weight coefficients for reducing reliability in sub-carriers with respect to the selected specific sub-carrier, a demodulation process for demodulating received wireless signals of sub-carriers, a weighted calculation process for performing weighted calculation applying weight coefficients to demodulated values of sub-carriers of wireless signals, and a decoding process for performing a decoding process for error correction on values calculated of sub-carriers.