摘要:
Data streams accumulated in a buffer (101) are modulated in a modulator (102). A multiplier (103) multiplies a signal output from the modulator (102) by a weight output from a weight controller (112). The signal output from the multiplier (103) is added in an adder (104), subjected to radio transmission processing by a transmission radio section (105), and transmitted via an antenna (106). A buffer controller (111) controls the buffer (101) according to a retransmission count output from a retransmission count detector (158). The weight controller (112) outputs a different weight from the previous transmission to the multiplier (103) each time data is retransmitted. Thus, it is possible to increase the diversity gain upon data retransmission even when the temporal change of the radio signal propagation path environment is moderate.
摘要:
Based on scheduling information generated in scheduler 104, notification information generating section 114 generates non-transmission information to a receiving station to which transmission of packet data is delayed or a receiving station to which packet data cannot be transmitted. The non-transmission information is transmitted to such a receiving station. The receiving station having received the non-transmission information is capable of recognizing that awaiting packet data will not be transmitted, and thereby of performing efficient radio reception processing without consuming useless waiting time.
摘要:
A complex correlation unit (110) complex-multiplies a base-band signal, obtained by frequency-converting a known signal sent from a base station device, that is a candidate communication partner, into a base-band frequency, by a known pattern for discriminating signals from respective base station devices, and conducts despreading to determine an amplitude value. A desired wave power measuring unit (111) averages an amplitude value with a specified number of symbols, and restricts an interference component to calculate a desired wave power value. An interference wave power measuring unit (112) deducts a desired wave power value from an amplitude value to separate an interference component. The division unit (113) divides a desired wave by an interference wave to calculate a CIR value for outputting to transmission units (102-1 to 102-n). The transmission units (102-1 to 102-n) performs such processing necessary for radio transmission as modulating, coding and frequency converting on a CIR value for transmitting via an antenna (103).
摘要:
A radio communication method is provided that enables the TFC pointer of a communication terminal apparatus to be made to match the TFC pointer of a radio base station apparatus. Amobile station changes its TFC pointer in line with a determined TFC and also transmits a TFCI at point in time t3. The base station checks the TFCI and updates its own TFC pointer so as to match with the TFC indicated by the TFCI. The base station determines a new TFC pointer, generates an up/down/keep signal by comparing the new TFC pointer with the updated TFC pointer, and transmits this signal at point in time t5. The mobile station updates the TFC pointer it is holding based on the up/down/keep signal received at point in time t6. As a result, the TFC pointers of both stations can be made to match even if the mobile station receives an up/down/keep signal erroneously at point in time t2.
摘要:
A GI insertion section 105 inserts a guard interval into transmission data. Delay addition sections 107-1, 107-2 set a delay time in the transmission data. An arrival time calculation section 115 calculates for each directivity an arrival time after data is transmitted from the other party of communication until the data is received from received data of each directivity. A delay time determining section 116 calculates a difference in the arrival time between transmission data transmitted with two directivities and sets the calculated arrival time difference in the transmission data to be transmitted with the directivity corresponding to the smaller arrival time as a delay time. A GI length determining section 117 sets a minimum arrival time of the calculated arrival times as a guard interval. This allows a transmission rate to be improved by shortening the length of a guard interval in a radio communication system to which a system of transmitting an OFDM signal with a directivity is applied.
摘要:
A DRC signal detecting section 113 demodulates a signal outputted from a despreading section 112 and detects a DRC signal; a transmitted-ratio calculating section 101 calculates the ratio of an amount of transmitted data to the total amount of data; an assigning section 102 decides the assignment of communication resources to each communication terminal based on the DRC signal which is detected by DRC signal detecting section 113 and the transmitted-ratio which is calculated by transmitted-ratio calculating section 101.
摘要:
A radio transmission apparatus capable of preventing a reduction of the capacity of a downlink and preventing an increase of interference inside or outside a cell involved in transmission of MCS information. In this radio transmission apparatus, the spreading code specification section 112 specifies combinations of spreading codes that will express MCS numbers. For example, the spreading code specification section 112 specifies 7 codes out of spreading codes #1 to #8. That is, if the selected MCS number is #1, the spreading code specification section 112 specifies spreading codes #2 to #8 and does not specify spreading code #1. This allows combinations of spreading codes to carry information on MCS#1 to #8. Since power corresponding to unused spreading codes is not detected through power detection of a despread signal on the receiving side, the spreading code number can be determined as the MCS number.
摘要:
The pilot signal generation section 103 generates pilot signals in such a way that the pilot signals have a predetermined time-varying pattern on pilot carriers. The pilot signal insertion section 104 allows the pilot carriers to carry only pilot signals. The apparatus on the receiving side carries out channel estimation by correlating the plurality of pilot signals carried on the pilot carriers with the same pattern as that used on the transmitting side. Furthermore, the apparatus on the transmitting side sends pilot signals having a time-varying pattern carried on subcarriers involving DC components which would not be used for information transmission by conventional multicarriers. This makes it possible to improve the transmission efficiency in a radio communication based on a multicarrier modulation system.
摘要:
A randmization section 101 makes the number of 1s and number of 0s of data the same. A coding section 102 performs coding processing on data in which the number of 1s and number of 0s have become the same. An HS-DSCH modulation and spreading section 103 performs M-ary modulation of the coded data, followed by spreading processing using a spreading code. Meanwhile, a common known signal undergoes M-ary modulation, followed by spreading processing using a spreading code, by a CPICH modulation and spreading section 104. The common known signal that has undergone spreading processing by CPICH modulation and spreading section 104 and data that has undergone spreading processing by HS-DSCH modulation and spreading section 103 are multiplexed by a multiplexing section 105. A multiplexed transmit signal is transmitted from a radio transmitting section 106. By this means, I-Q plane reference points can be found with a high degree of accuracy by means of a simple circuit configuration.
摘要:
Control section 115 calculates the timing of virtual timeout based on timeout information, and outputs to layer 2 downlink processing section 111 an MCS control signal which is a control signal to show updated modulation technique when the timing of virtual timeout is pressed. When the MCS control signal from control section 115 is inputted into layer 2 downlink processing section 111, the m-ary modulation is reduced and the data accumulated in memory is modulated. Layer 1 transmission section 112 transmits the signal outputted from layer 2 downlink processing section 111 as a radio signal via antenna after being subjected to a radio processing. Accordingly, even if radio terminal apparatus radio transmits an ACK signal, it is possible to prevent the time-out before the reception of ACK signal by transmission side terminal apparatus, hence, it is possible to prevent the deterioration of throughput due to reducing the size of the next data transmission.