摘要:
An ARQ retransmission method in a communication system, wherein data packets comprising modulation symbols are retransmitted based on an automatic repeat request and subsequently combined with previously received data packets, the symbols of said data packets being modulated by a mapping unit employing a predetermined signal constellation. The retransmitted data packets being retransmitted in form of a selected one of a plurality of different redundancy versions. According to the invention, the bits to be transmitted are reordered prior to modulation over the retransmissions in accordance with the selected redundancy version.
摘要:
The invention relates to method and apparatus for generating modulation symbols according to a second symbol mapping scheme by a symbol mapping unit being adapted to generate symbols according to a first symbol mapping scheme, wherein the first and second symbol mapping schemes define different mappings of data words of a stream to modulation symbols of a modulation scheme according to the respective symbol mapping scheme. Further, the invention relates to a method and apparatus for generating a mapping of data words to modulation symbols of a square 16 QAM constellation, the modulation symbols being representable by an inphase component and quadrature component. One aspect of the invention is the introduction of a bit sequence transformer unit transforming the data words to be mapped to modulation symbols prior to mapping thereby changing the Hamming distance properties of the mapping. Another aspect of the invention is the generation of a new AICO (Antipodal Inverted COnstellation) mapping scheme.
摘要:
Transmit diversity system in which constellation rearrangement is used. Both diversity signals contain the same data and both are 16-QAM, but the location of the data bits within the constellation is different. This averages the effect of the different levels of reliability of the different constellation points. A method for modifying a quadruple of data bits in a data transmission system using Quadrature. Amplitude Modulation with 16 different modulation states, 16-QAM, using an Antipodal Inverted Constellation AICO) mapping, swapping bits selecting contiguous symbol regions with bits selecting non-contiguous symbol regions. Depending on the particular pre-defined mapping and on the particular permutation of bits, inversion of selected bits may be performed in addition. The quadruples thus obtained are mapped to modulation symbols according to a pre-defined AICO mapping. In the corresponding method for receiving the symbols, likelihood values are swapped and modified in a way which is complementary to the permutation and inversion of bits, before they are combined with likelihood values from other symbols representing the same bits. Method ensures that there is a one to one correspondence between Hamming distance and Euclidian distance for the combined received data. In other words it ensures that, once combined, all 4 bit data words which differ by the same number of bits (Hamming distance) are the same distance apart in the constellation (Euclidian distance).
摘要:
A method of transmitting data in a wireless communication system from a transmitter to a receiver, comprising the steps of modulating data at the transmitter using a first signal constellation pattern to obtaing a first data symbol. The first data symbol is transmitteds to the receiver using a first diversity branch. Further, the data is modulated at the transmitter using a second signal constellation pattern to obtain a second data symbol. Then, the second data symbol is transmitted to the receiver over a second diversity path. Finally, the received first and second data symbol are diversity combined at the receiver. The invention further relates to a transmitter and a receiver embodies to carry out the method of invention.
摘要:
A method and a decoder for determining erasures in an FEC (Forward Error Correction) decoding process decoding data encoded with concatenated codes is provided. First output data are generated by decoding first input data Second output data are generated by decoding second input data, the second input data including at least a part of the first output data. The first and the second output data are compared for updating a comparison result accumulation parameter based on the comparison result. Finally, it is determined whether an erasure is to be set based on the updated comparison result accumulation parameter.
摘要:
A method of transmitting data from a transmitter to a receiver of a diversity (e.g. ARQ or reptetition coding) communication system comprising the step of encoding data received from a signal source to generate a Galois field (GF) symbols (101). The method further comprises the steps of modifying redundant GF symbols by an arithmetic operation (102) mapping the GF symbols using QPSK as modulation scheme (104) and transmitting the QPSK modulation symbols and the modified redundant symbols (105) to the receiver. Furthermore, the invention concerns a corresponding transmitter of a diversity communication system.
摘要:
The invention relates to the performing, by a mobile station, of a PUSCH transmission (3) in response to a DCI transmission (1). Specifically, in case a first TDD uplink/downlink configuration, according to which the communication is configured, is different from a second TDD uplink/downlink configuration, on the basis of which the DCI to PUSCH timing relations are defined (2a), and in case these DCI to PUSCH timing relations define plural timing relations for performing PUSCH transmissions in response to a single DCI transmission (2b), the mobile station applies a pre-stored association (2c) indicating a single timing relation that is to be used for determining the PUSCH transmission based on the subframe in which the corresponding DCI transmission is received (2d).
摘要:
This invention concerns concepts for signaling resource allocation information to a terminal that indicates to the terminal assigned resources for the terminal. The terminal can receives downlink control information (DCI), which comprises a field for indicating the resource allocation information of the terminal. This resource assignment field within the DCI has a predetermined number of bits. The terminal can determines its assigned resource allocation information from the content of the received DCI, even though the bit size of the resource allocation field in the received DCI is insufficient to represent all allowed resource allocations. According to an embodiment, the received bits that are signaled to the terminal in the DCI represent predetermined bits of the resource allocation information. All remaining one or more bits of the resource allocation information that are not included in the field of the received DCI are set to predetermined value.
摘要:
The present invention relates to transmitting data on a shared communication channel in a communication system supporting multiple hybrid automatic repeat request processes and configurable to apply a bundling of transmission time intervals. The data transmitting including mapping of TTIs of the HARQ processes cyclically onto subframes. In order to efficiently support dynamic bundle scheduling, when a grant is received during a bundle transmission, this grant becomes a shifting grant, according to which the bundle is transmitted and according to the location of which the timing of the grant reception and the data transmission is adapted. The transmission of the shifted bundle is performed in accordance with the state of its retransmission process, i.e. the bundle is either initially transmitted or retransmitted.
摘要:
The present invention relates to triggering, in a terminal of a communication system, channel quality feedback reporting for at least one of plural component carriers of the communication system available for downlink transmission. The at least one component carrier is selected based on the downlink traffic of the terminal. Reporting of the channel quality information is triggered by dedicated control information received by the terminal.