Abstract:
A rate adjustment apparatus includes a first calculating section that calculates a first parameter for calculating judgment values used for judging whether puncturing or repetition is to be performed with respect to individual bits of input data, a second calculating section that sequentially calculates a second parameter for each of a plurality of processing units into which input data is divided, by computation using a recurrence equation obtained from a relationship between the judgment values corresponding to two processing units of the plurality of processing units, and an executing section that obtains the judgment values with respect to individual bits forming each of the processing units by using the first parameter and the second parameter respectively calculated by the first calculating section and the second calculating section, and executes deletion or addition of bits based on the obtained judgment values.
Abstract:
A communications system, including a transmitter and a receiver that performs radio communications with the transmitter in a plurality of types of communications services, the transmitter includes, a controller that controls guard intervals at a plurality of codes, which are unique to respective cells and correspond to any one of the plurality of types of communications services, so that lengths of guard intervals of the plurality of codes become same; and a transmitting unit that transmits first codes among the plurality of codes using a first band set in a transmission band, and also transmits second codes among the plurality of codes different from the first codes using a second band set in the transmission band that is different from the first band set, and the receiver includes, a receiving unit that receives the plurality of codes transmitted from the transmitter.
Abstract:
In a cell-specific pilot signal transmitting method for use in a mobile communication system that comprises a base station and a wireless mobile station in the cell of a wireless communication area formed by the base station and that can mix and then transmit unicast data and broadcast/multicast data as downstream data from the base station to the mobile station, the difference between the start phase of a cell-specific pilot signal transmitted in a subframe in which the base station transmits the unicast data and the start phase of a cell-specific pilot signal transmitted in the next subframe is equal to the difference between the start phase of a cell-specific pilot signal transmitted in a subframe in which the base station transmits the broadcast/multicast data and the start phase of a cell-specific pilot signal transmitted in the next subframe.
Abstract:
A radio communication system, including: a transmission apparatus; and a reception apparatus, wherein the transmission apparatus and reception apparatus performs a radio communication, the transmission apparatus includes: one or more processor configured to enlarge a sequence length of a transmission data by repeating a sequence of the transmission data, and to perform a first subcarrier arrangement to arrange each of components included in the enlarged transmission data to each of subcarrier according to positions of the each of components in the enlarged transmission data, and to puncture the component of the arranged transmission data, when the subcarrier is not used for transmission; and a transmitter which transmits the transmission data arranged on the subcarrier to the reception apparatus, and the reception apparatus includes a receiver which receives the transmission data.
Abstract:
A radio communication apparatus includes a receiving unit configured to receive signals, an obtaining unit configured to obtain a reference amplitude that depends on a modulation scheme for a received signal received by the receiving unit, and on amplitude fluctuations of the received signal in a propagation path, a demodulating unit configured to demodulate the received signal to obtain an in-phase component and a quadrature component of each received symbol included in the received signal, a calculating unit configured to calculate a likelihood ratio for each of bits mapped to each received symbol using the reference amplitude and the in-phase or quadrature component, and a decoding unit configured to perform error correction decoding on the received signal using the calculated likelihood ratios.
Abstract:
In a multi-carrier cellular system, a second synchronization code (a Walsh code or a GCL series code) mapped on a second synchronization channel is used as a signal for specifying in which cell of the base station a mobile station terminal device itself is. A signal transmitted from the base station to the mobile station terminal device is mapped in a radio frame having two-dimensional extension in frequency and time directions. When mapping a certain series number of the second code for specifying a cell or a cell group on the radio frame as the second synchronization channel, phase rotation or circular shift in which one radio frame is one cycle is applied to the second synchronization code. On the receiving side, the head timing of the radio frame is known by knowing the phase rotation angle or the amount of circular shift of the second synchronization code.
Abstract:
A transmitter time-division-multiplexes, in time domain, to assign at least a part of a second signal stream of a second channel being relatively high error-resilient compared to a first signal stream of a first channel between a boundary of the blocks and the first signal stream of the first channel of a time-division-multiplexing signal.
Abstract:
A radio communication system including: a base station apparatus; and a mobile station apparatus, the mobile station apparatus includes: a receiver which receives data signal transmitted from the base station apparatus; a controller which switches a unit of grouping to the data signal and groups the data signal, according to one parameter or a combination of a plurality of parameters out of a type of a channel, a type of modulation scheme and encoding rate, an assigned resource amount, or a number of transmitting antennas of the mobile station apparatus, when an ACK signal or an NACK signal to the data signal is transmitted; and a transmitter which transmits the ACK signal or the NACK signal in each the group, and the base station apparatus includes: a transmitter which transmits the data signal; and a receiver which receives the ACK signal or the NACK signal.
Abstract:
In a case where multiple kinds of frames having different lengths (Ngi_s and Ngi_l) of guard intervals inserted before the head of the effective data, the length of the guard intervals are adjusted in such a manner that at least the position of a part of the effective data is are apart from frame timing by the same amount. Thereby, on the receiving end, it is always possible to perform reception processing such as FFT processing in an appropriate time division at a fixed timing, without causing sample deviation of the effective data.
Abstract:
A first base station receives from a mobile terminal identification information indicating a combination of a weight coefficient for the first base station and a weight coefficient for a second base station, transfers the received identification information to the second base station, and performs precoding of a data signal to be transmitted to the mobile terminal by collaborative transmission, by using the weight coefficient for the first base station identified by means of latest identification information. The second base station receives the identification information from the first base station, and performs precoding of a data signal to be transmitted by collaborative transmission, by using the weight coefficient for the second base station identified by means of identification information obtained as latest identification information and different from that for the weight coefficient for the first base station used for precoding of the data signal.