IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0876015
(2001-06-07)
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발명자
/ 주소 |
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출원인 / 주소 |
- BellSouth Intellectual Property Corporation
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
9 인용 특허 :
16 |
초록
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The cost of a long distance call on a telephone system from a first telephone station to a second telephone station is estimated. The first telephone station has a corresponding calling number and the second telephone station has a corresponding called number. The called number, including a telephon
The cost of a long distance call on a telephone system from a first telephone station to a second telephone station is estimated. The first telephone station has a corresponding calling number and the second telephone station has a corresponding called number. The called number, including a telephone code, is received from the first telephone station. The telephone code is parsed from the called number and a calling plan is determined. The cost is estimated based on the telephone code and the calling plan.
대표청구항
▼
The cost of a long distance call on a telephone system from a first telephone station to a second telephone station is estimated. The first telephone station has a corresponding calling number and the second telephone station has a corresponding called number. The called number, including a telephon
The cost of a long distance call on a telephone system from a first telephone station to a second telephone station is estimated. The first telephone station has a corresponding calling number and the second telephone station has a corresponding called number. The called number, including a telephone code, is received from the first telephone station. The telephone code is parsed from the called number and a calling plan is determined. The cost is estimated based on the telephone code and the calling plan. tion and M order orthogonal modulation spread spectrum digital transmission, said receiver module comprising: a first input (E1) for receiving a signal to be processed (r(t)), M filtering channels, each with a filter (401,402,. . . , 40M) matched to a spread code (Ci) taken from within a group of M codes, M means (411,412,. . . , 41M) for calculating the energy (or amplitude) of the output signals of the M filtering channels on a symbol, selection means (44) connected to the M energy (amplitude) calculating means, said selection means (44) being able to determine the highest energy (or amplitude) signal and for delivering on a first output (44s) the number of the channel corresponding to said maximum energy (amplitude), switching means (45) connected to M matched filters across M delay circuits (431,432,. . . ,43M) and having an output (45s), said switching means (45) being able to switch one of its inputs to the output (45d) under the control of the channel number delivered by the selection means (44), means (46) connected to the first output (44s) of the selection means (44) and able to deduce from the number of the channel the corresponding spread code (Ci) and to restore a first data subgroup (mMOK), phase differential demodulation means (58, 60) connected to the output (44s) of the switching means (45) and able to restore a second data subgroup (mPSK), said receiver module being characterized in that: a) the selection means (44) also deliver to a second output (44's) the selected maximum energy (or amplitude) value, b) it comprises supplementary inputs and outputs permitting the cascading of several such receiver modules, i) the supplementary inputs comprising: a second input (E2) connected to the input of said selection means (44), which consequently receive, besides the M signals delivered by the M filtering channels, the signal carried by said (M+1)th channel, a third input (E3) connected to the input of said switching means (45), which consequently receive, besides the M signals delivered by the M filtering channels, the signal applied to said third input (E3), a fourth input (E4) connected to the input of the means (46) able to deduce from a channel number the corresponding spread code (Cu), ii) the supplementary outputs comprising: a first output (S1) connected to the first input (E1) across a delay means (61), a second output (S2) connected to the second output (44s) of the selection means (44) delivering the selected maximum energy (or amplitude) value, a third output (S3) connected, across a delay means (63), to the output (45s) of the switching means (45), a fourth output (S4) connected to the first output (44s) of the selection means (44) delivering the number of the channel having the maximum energy (amplitude). 2. Receiver for differential phase modulation and orthogonal modulation digital transmission, characterized in that it comprises a plurality of receiver modules (R1,. . . , Ri-1,. . . , Rn) in accordance with claim 1, said modules being cascaded, each of said n receiver modules working with a group of M particular codes, the inputs (E1, E2, E3) of a receiver module of rank i being connected to the corresponding outputs (S1, S2, S3) of the receiver module of rank (i-1), the final receiver module of rank n (Rn) fulfilling a particular function and being called the master module, said master module receiving on its fourth input (E4) all the numbers of channels delivered by the fourth outputs (S4) of the (n-1) preceding receiver modules, all said numbers forming a global number, the second means (46) of said master module (Rn) deducing from said global number the corresponding spread code and restoring a first data subgroup (mMOK), the fourth phase demodulat ion means (58, 60) of said master module receiving the final switched signal and performing demodulation in order to deliver a second data subgroup (mDPSK), said master module (Rn) then reconstructing the transmitted global system, said receiver being also characterized in that the fourth demodulation means of the (n-1) receiver modules preceding the master module (Rn) are not used. 3. Receiver according to claim 2, wherein, in each receiver module of rank i (Ri), the selection means (44) compare the energies of M+1 signals, namely the energies of M output signals of M matched filters and the value of the energy applied to the second input (E2) of the module and corresponding to the highest energy from the receiver module of the preceding rank, said selection means functioning in the following way: if the highest energy signal is one of the M filtered signals, said selection means (44) normally deliver the maximum energy value and the number of the channel, and the switching means (45) deliver the corresponding switched signal to the third output (S3), if the maximum value is that corresponding to the signal applied to the second input (E2), i.e. to the signal from the preceding module (Ri-1-1), then said switching means (45) transmit the signal applied to the third input (E3) directly to the third output (S3), said signal consequently passing from the receiver module of rank i-1 (Ri-1) to the receiver module of rank i+1(Ri-1). ections of said received signal, comprising the steps of: (1) setting part of data as an extended unique word; (2) detecting the fading distortion of said unique word as said pilot signal as a first fading distortion and detecting the fading distortion of said extended unique word as a second fading distortion; (3) estimating the fading distortion of data based on said first and second fading distortions; and (4) demodulating data based on said fading distortion of data. 2. A method for demodulating a received signal including a pilot signal, according to claim 1, wherein: said step (1) includes a step of setting part of data that is apart from said unique word as said pilot signal as said extended unique word independent of said unique word as said pilot signal. 3. A method for demodulating a received signal including a pilot signal, according to claim 1, wherein: said step (1) includes the steps of setting part of data adjacent to said unique word as said pilot signal as a first extended unique word attached to said unique word as said pilot signal, and setting part of data that is apart from said unique word as said pilot signal as a second extended unique word independent of said unique word as said pilot signal; and said step (2) includes the steps of detecting the fading distortion of said first extended unique word as said first fading distortion, and detecting the fading distortion of said second extended unique word as said second fading distortion. 4. A method for demodulating a received signal including a pilot signal, according to claim 1, wherein: said steps (1) to (4) are conducted based on said received signal that is stored into memory in units of a burst signal. 5. A method for demodulating a received signal including a pilot signal while estimating the fading distortion of data by detecting the fading distortion of a unique word as said pilot signal inserted into multiple sections of said received signal, comprising the steps of: (1) setting part of data adjacent to said unique word as a first extended unique word attached to said unique word; (2) setting part of data that is apart from said unique word as a second extended unique word independent of said unique word; (3) estimating the fading distortion of said first and second extended unique words; (4) estimating the fading distortion of data in said received signal based on said fading distortion of said first and second extended unique words; and (5) demodulating data in said received signal based on the estimation result of fading distortion of data in said received signal. 6. A method for demodulating a received signal including a pilot signal, according to claim 5, wherein: said step (3) includes the steps of estimating the fading distortion of said first extended unique word based on a known value of said unique word and the provisional hard decision result of said adjacent part of data demodulated, and estimating the fading distortion of said second extended unique word based on the provisional hard decision result of said independent part of data demodulated. 7. A method for demodulating a received signal including a pilot signal, according to claim 5, wherein: said step (4) includes the step of estimating the fading distortion of data in said received signal using MAP operation represented by: ck=rkH·(RD+N0)-1·αT rkH=(α(k-p0)α(k-p1) . . . α(k-pn-t)) (5) where and R,N indicate covariance matrices, λ indicates Doppler frequency, rk indicates correlation between kth symbol and respective unique words, a indicates a vector of reverse-modulated unique word, and p0to pn-1indicate positions of unique words in burst signal, based on the fading distortion of said first and second extended unique words. 8. A method for demodulating a received sign
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