Reception section 602 receives a signal on which signals of channels are multiplexed in a same frequency band through antenna 601 . Separation section 603 separates a part used for correlation value calculation in the reception signal. Correlation sections 604 and 605 create delay profiles by calcul
Reception section 602 receives a signal on which signals of channels are multiplexed in a same frequency band through antenna 601 . Separation section 603 separates a part used for correlation value calculation in the reception signal. Correlation sections 604 and 605 create delay profiles by calculating a correlation value using a 1st basic code and 2nd basic code for the signals after the separation, respectively. Comparison/channel estimation section 606 cycles each delay profile so that the delay profiles match in a section in which the path of the channel to be detected appears when there is no propagation delay and detects a quasi-matching path in each delay profile after the cycling.
대표청구항▼
1. A communication terminal apparatus comprising:a creator for creating a transmission signal by multiplexing at least two known reference signals for one channel; anda transmitter for transmitting the created transmission signal, wherein:the creator creates the transmission signal by code-multiplex
1. A communication terminal apparatus comprising:a creator for creating a transmission signal by multiplexing at least two known reference signals for one channel; anda transmitter for transmitting the created transmission signal, wherein:the creator creates the transmission signal by code-multiplexing the two known reference signals, specified by a base station apparatus from among a plurality of mutually different known reference signals, for the one channel at the same time, andthe creator uses, as the two known reference signals, one of first codes created by extracting a predetermined length from points to which a reference point in a first cyclic reference code is shifted sequentially in either direction and one of second codes created by extracting said predetermined length from points to which a reference point in a second cyclic reference code is shifted sequentially in the opposite direction. 2. A base station apparatus comprising:a receiver for receiving a signal on which transmission signals code-multiplexing at least two known reference signals, of a plurality of mutually different known reference signals, for one channel are multiplexed at the same time in the same frequency band; anda delay detector for detecting a propagation delay of the channel using the received signal, the delay detector comprising:a delay profile creator that creates a first delay profile and a second delay profile by calculating correlation values using a first cyclic reference code and second cyclic reference code and the received signal; anda detector that detects the propagation delay about the channel using each of the first and second delay profiles. 3. The base station apparatus according to claim 2, wherein the delay detector further comprises:an adjuster for adjusting the position of each delay profile so that when there is no delay about the channel, reference phases of the first and second delay profiles match for maximum correlation values between the two known reference signals and the received versions of the two known reference signals of the of a desired wave;a recognizer for recognizing matching paths in the first and second delay profiles, whose positions have been adjusted, as the path of the channel; anda determiner for determining a phase difference between the phase of the recognized path and the reference phases as the propagation delay of the recognized path. 4. The base station apparatus according to claim 2, further comprising:a control signal creator that creates a time alignment control signal for indicating transmission timing to the channel based on a detection result provided by the delay detector. 5. A base station apparatus comprising:a receiver that receives a signal on which transmission signals code-multiplexing at least two known reference signals, of a plurality of mutually different known reference signals, for one channel are multiplexed at the same time in the same frequency band; anda delay detector that detects a propagation delay of the channel using the received signal, wherein:the receiver receives, as the two known reference signals, one of first codes created by extracting a predetermined length from points to which a reference point in a first cyclic reference code is shifted sequentially in either direction and one of second codes created by extracting said predetermined length from points to which a reference point in a second cyclic reference code is shifted sequentially in the opposite direction. 6. A base station apparatus comprising:a receiver that receives a signal on which transmission signals time-multiplexing a known reference signal, of a plurality of mutually different known reference signals, for one channel is multiplexed for every specific unit of time and distinct known reference signals of the plurality of known reference signals are time-multiplexed in contiguous units of time in the same frequency band; anda delay detector that detects a propagation delay of the channel u sing the received signal, the delay detector comprising:a creator that creates a delay profile for every selected unit of time by calculating a correlation value using the received signal and a cyclic reference code;a detector that detects the propagation delay about the channel using the delay profile created by said creator;an adjuster that adjusts the position of the delay profile corresponding to each specific unit time, for each of multiple delay profiles created by the creator, so as to match a reference phase at which the correlation between the known reference signal and the received version of the known reference signal reaches a maximum for a desired wave when there is no delay in the channel;a recognizer that recognizes matching paths between delay profiles, whose positions have been adjusted, as the path of said channel; anda determiner that determines the phase difference between the phase of the recognized path and said reference phase as the propagation delay of said recognized path, wherein:said specific unit of time is a unit of time for time-multiplexing the known reference signal in the channel. 7. The base station apparatus according to claim 6, wherein the adjuster adjusts the position of the delay profile based on an average of multiple delay profiles. 8. The base station apparatus according to claim 6, wherein the plurality of known reference signals are created by extracting a predetermined length from points to which a reference point in a cyclic first reference code is shifted sequentially in either direction. 9. A base station apparatus comprising:a receiver for receiving a multiplexed signal on which transmission signals with a known reference signal, created from and including a reference code, for one channel are multiplexed in the same frequency band;a first correlation value calculator for creating a delay profile by calculating a correlation value using the multiplexed signal and the reference code;a second correlation value calculator for calculating a correlation value using the multiplexed signal and a spreading code assigned to the channel; anda channel estimator for carrying out channel estimation based on the delay profile and the correlation value calculated by said second correlation value calculator. 10. The base station apparatus according to claim 9, wherein the second correlation value calculator further comprises:a timing estimator for detecting a channel corresponding to the position of the delay profile about a predetermined path of the delay profile and estimating the start timing of an information signal corresponding to the channel in the multiplexed signal; anda calculator for calculating a value of correlation between a signal extracted from the multiplexed signal, by a predetermined length from the start timing estimated about the predetermined path and a spreading code assigned to the channel detected about said predetermined path, wherein:the channel estimator decides the path of the channel detected by said timing estimator only when the correlation value calculated about the predetermined path exceeds a threshold. 11. The base station apparatus according to claim 9, further comprising a control signal creator for creating a time alignment control signal to indicate transmission timing to the channel based on the channel estimation result provided by the channel estimator.
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