초록 ▼

A receiving device in a multi-carrier CDMA communication system. In the receiving device, a time compensation means has a time tracker for each of signals received on multi-carriers and generates a time delay compensation signal by combining time errors of the carriers received from the time tracker

A receiving device in a multi-carrier CDMA communication system. In the receiving device, a time compensation means has a time tracker for each of signals received on multi-carriers and generates a time delay compensation signal by combining time errors of the carriers received from the time trackers. A first PN sequence generator generates a first PN sequence whose time delay is compensated for by the time delay compensation signal. A plurality of PN despreaders PN-despread the signals received on the multi-carriers by the first PN sequence. A frequency compensation means detects pilot signals corresponding to the PN-despread signals, generates frequency error signals for the carriers by the detected pilot signals, and compensates for frequency errors of the signals received on the multi-carriers. A phase compensation means compensates for phases for the carriers using the PN-despread signals and the pilot signals. A multiplexer multiplexes the phase-compensated signals.

대표청구항 ▼

1. A receiving device in a multi-carrier CDMA communication system, comprising:a first PN sequence generator for generating a first PN sequence for PN-despreading signals received on multi-carriers;a second PN sequence generator for generating second PN sequences by advancing and delaying the first

1. A receiving device in a multi-carrier CDMA communication system, comprising:a first PN sequence generator for generating a first PN sequence for PN-despreading signals received on multi-carriers;a second PN sequence generator for generating second PN sequences by advancing and delaying the first PN sequence by a predetermined time period;a time tracker for despreading a signal received on one carrier among the signals received on multi-carriers by the second PN sequences and detecting a time error using an early and a late despread signals; anda time compensator for generating a control signal to compensate for a time error of the first PN sequence by the detected time error. 2. The receiving device of claim 1, wherein the time tracker comprises:a PN despreader for generating early and late despread signals by sequentially multiplying the signal received on the carrier by the second PN sequences; anda time error detector for detecting the time error by subtracting a square signal of the late despread signal from a square signal of the early despread signal. 3. A receiving device in a multi-carrier CDMA communication system, comprising:a PN sequence generator for generating a PN sequence for PN-despreading carriers received on multi-carriers;a PN despreader for despreading a signal received on one carrier among the signals received on the multi-carriers by the PN sequence;a pilot filter for detecting a pilot signal from the PN-despread signal;a frequency tracker for detecting a frequency error by subtracting the product of the current I-channel pilot signal and a previous Q-channel pilot signal from the product of a previous I-channel pilot signal and a current Q-channel pilot signal of the detected pilot signal; anda frequency compensator for compensating for frequency errors of the signals received on the multi-carriers by the detected frequency error. 4. A receiving device in a multi-carrier CDMA communication system, comprising:a first PN sequence generator for generating a first PN sequence to PN-despread signals received on multi-carriers;a despreader for despreading the signals received on the multi-carriers by the first PN sequence;a pilot filter for detecting a pilot signal from at least one of the despread signals;a frequency tracker for detecting a frequency error by subtracting the product of a current I-channel pilot signal and a previous Q-channel pilot signal from the product of a previous I-channel pilot signal and a current Q-channel pilot signal of the detected pilot signal;a frequency compensator for compensating for frequency errors of the signals received on the multi-carriers by the detected frequency error;a second PN sequence generator for generating second PN sequences by advancing and delaying the first PN sequence by a predetermined time period;a time tracker for despreading at least one signal received on one carrier among the signals received on multi-carriers by the second PN sequences and detecting time errors using the two despread signals; anda time compensator for feeding to the first PN sequence generator a control signal to adjust a time position at which to generate the first PN sequence. 5. The receiving device of claim 4, wherein the time tracker comprises:a PN despreader for generating early and late despread signals by sequentially multiplying the at least one signal received on the carrier by the second PN sequences; anda time error detector for detecting a time delay value by the power difference between the early and late despread signals. 6. A receiving device in a multi-carrier CDMA communication system, comprising:time compensation means having a time tracker for each of signals received on multi-carriers, for generating a time delay compensation signal by combining time errors of the carriers received from the time trackers;a first PN sequence generator for generating a first PN sequence whose time delay is compensated for by the time delay compensation signal;a plurality of P N despreaders for PN-despreading the signals received on the multi-carriers by the first PN sequence;frequency compensation means for detecting pilot signals corresponding to the PN-despread signals, generating frequency error signals for the carriers by the detected pilot signals, and compensating for frequency errors of the signals received on the multi-carriers;phase compensation means for compensating for phases of the carriers using the PN-despread signals and the pilot signals; anda multiplexer for multiplexing the phase-compensated signals. 7. The receiving device of claim 6, wherein the time compensation means comprises:a second PN sequence generator for generating second PN sequences by advancing and delaying the first PN sequence by a predetermined time period;a plurality of PN despreaders for generating early and late despread signals by sequentially multiplying the signals received on the multi-carriers by the second PN sequences;a plurality of time error detectors provided corresponding to the PN despreaders, for detecting time errors by the power differences between the early and late despread signals;a time tracking combiner for combining the time errors received from the time error detectors; anda time compensator for feeding a control signal to the first PN sequence generator to adjust a time position at which to generate the first PN sequence based on the combined time error. 8. The receiving device of claim 6, wherein the frequency compensation means comprises:a plurality of pilot filters for detecting the pilot signals from the corresponding PN-despread signals;a plurality of frequency trackers for detecting frequency errors by subtracting the products of a current I-channel pilot signal and a previous Q-channel pilot signal from the products of a previous I-channel pilot signal and a current Q-channel pilot signal of the detected pilot signals;a frequency compensator for compensating for frequency errors of the signals received on the multi-carriers by the detected frequency errors. 9. The receiving device of claim 6, wherein, the phase compensation means comprises:a plurality of pilot filters for detecting the pilot signals from the corresponding PN-despread signals;a plurality of multipliers for multiplying the PN-despread signals by corresponding unique orthogonal codes, for orthogonal demodulation;a plurality of symbol accumulators for accumulating the outputs of the multipliers in symbol units; anda plurality of phase compensators for compensating for phases of the outputs of the symbol accumulators using the corresponding pilot signals received from the pilot filters. 10. A receiving device in a multi-carrier CDMA communication system, comprising:time compensation means having a time tracker for at least one signal received on multiple carriers, for generating a time delay compensation signal corresponding to a time error received from the time tracker;a first PN sequence generator for generating a first PN sequence whose time delay is compensated for by the time delay compensation signal;a plurality of PN despreaders for PN-despreading signals received on multi-carriers by the first PN sequence;frequency compensation means for detecting pilot signals corresponding to the PN-despread signals, generating a frequency error signal for the carriers by at least one of the detected pilot signals, and compensating for frequency errors of the signals received on the multi-carriers;phase compensation means for compensating for phases of the carriers using the PN-despread signals and the pilot signals; anda multiplexer for multiplexing the phase-compensated signals. 11. The receiving device of claim 10, wherein the time compensation means comprises:a second PN sequence generator for generating second PN sequences by advancing and delaying the first PN sequence by a predetermined time period;a PN despreader for generating early and late despread signals by sequentially multiplying at least one signal received o n a carrier by the second PN sequences;a time error detector for detecting time errors by the power difference between the early and late despread signals; anda time compensator for feeding a control signal to adjust a time position at which to generate the first PN sequence based on the combined time error to the first PN sequence generator. 12. The receiving device of claim 10, wherein the frequency compensation means comprises:a plurality of pilot filters for detecting the pilot signals from the corresponding PN-despread signals;a frequency tracker for detecting a frequency error by subtracting the product of a current I-channel pilot signal and a previous Q-channel pilot signal from the product of a previous I-channel pilot signal and a current Q-channel pilot signal of one of the detected pilot signals; anda frequency compensator for compensating for frequency errors of the signals received on the multi-carriers by the detected frequency error. 13. The receiving device of claim 10, wherein the phase compensation means comprises:a plurality of pilot filters for detecting the pilot signals from the corresponding PN-despread signals;a plurality of multipliers for multiplying the PN-despread signals by corresponding unique orthogonal codes, for orthogonal demodulation;a plurality of symbol accumulators for accumulating the outputs of the multipliers in symbol units; anda plurality of phase compensators for compensating for phases of the outputs of the symbol accumulators using the corresponding pilot signals received from the pilot filters. 14. A receiving method in a multi-carrier CDMA communication system, comprising the steps of:detecting a time error corresponding to at least one signal received on one carrier among signals received on multi-carriers and generating a time delay compensation signal corresponding to the detected time error;generating a first PN sequence whose time delay is compensated by the time delay compensation signal;PN-despreading the signals received on the multi-carriers by the first PN sequence;detecting a pilot signal corresponding to each of the PN-despread signals, generating a frequency error signal by at least one of the detected pilot signals, and compensating for frequency errors of the signals received on the multi-carriers;compensating for phases for the respective carriers using the PN-despread signals and the pilot signals; andmultiplexing the phase-compensated signals. 15. The receiving method of claim 14, wherein the time delay compensation signal generating step comprises the steps of:generating second PN sequences by advancing and delaying the first PN sequence by a predetermined time period;generating early and late despread signals by sequentially multiplying at least one signal received on a carrier by the second PN sequences;detecting a time error by the power difference between the early and late despread signals; andgenerating a control signal to adjust a time position at which to generate the first PN sequence based on the combined time error. 16. The receiving method of claim 14, wherein the frequency error compensating step comprises the steps of:detecting the pilot signals from the corresponding PN-despread signals;detecting a frequency error by subtracting the product of a current I-channel pilot signal and a previous Q-channel pilot signal from the product of a previous I-channel pilot signal and a current Q-channel pilot signal of at least one of the detected pilot signals; andcompensating for frequency errors of the signals received on the multi-carriers by the detected frequency error. 17. The receiving method of claim 14, wherein the phase compensating step comprises the steps of:multiplying the PN-despread signals by corresponding unique orthogonal codes, for orthogonal demodulation;accumulating the orthogonally demodulated signals in symbol units; andcompensating for phases of the signals received on the multi-carriers using the corresponding pilot signals. 18. A re ceiving device in a multi-carrier CDMA communication system, comprising:time compensation means having a time tracker for each of signals received on multi-carriers, for generating a time delay compensation signal by combining time errors of the carriers received from the time trackers;a first PN sequence generator for generating a first PN sequence whose time delay is compensated for by the time delay compensation signal;a plurality of PN despreaders for PN-despreading the signals received on the multi-carriers by the first PN sequence;frequency compensation means for detecting pilot signals corresponding to the PN-despread signals, generating a frequency error signal for the carriers by at least one of the detected pilot signals, and compensating for frequency errors of the signals received on the multi-carriers;phase compensation means for compensating for phases of the carriers using the PN-despread signals and the pilot signals; anda multiplexer for multiplexing the phase-compensated signals. 19. The receiving device of claim 18, wherein the time compensation means comprises:a second PN sequence generator for generating second PN sequences by advancing and delaying the first PN sequence by a predetermined time period;a plurality of PN despreaders for generating early and late despread signals by sequentially multiplying the signals received on the multi-carriers by the second PN sequences;a plurality of time error detectors provided corresponding to the PN despreaders, for detecting time errors by the power differences between the early and late despread signals;a time tracking combiner for combining the time errors received from the time error detectors; anda time compensator for feeding a control signal to the first PN sequence generator to adjust a time position at which to generate the first PN sequence based on the combined time error. 20. The receiving device of claim 18, wherein the frequency compensation means comprises:a plurality of pilot filters for detecting the pilot signals from the corresponding PN-despread signals;a frequency tracker for detecting a frequency error by subtracting the product of a current I-channel pilot signal and a previous Q-channel pilot signal from the product of a previous I-channel pilot signal and a current Q-channel pilot signal of one of the detected pilot signals; anda frequency compensator for compensating for frequency errors of the signals received on the multi-carriers by the detected frequency error. 21. The receiving device of claim 18, wherein the phase compensation means comprises:a plurality of pilot filters for detecting the pilot signals from the corresponding PN-despread signals;a plurality of multipliers for multiplying the PN-despread signals by corresponding unique orthogonal codes, for orthogonal demodulation;a plurality of symbol accumulators for accumulating the outputs of the multipliers in symbolic units; anda plurality of phase compensators for compensating for phases of the outputs of the symbol accumulators using the corresponding pilot signals received from the pilot filters.