Method for receiving multipath signals in a radio communications system with a code division multiple access and device for carrying out said method
First Claim
1. A method of multipath signal receiving in a CDMA mobile communications system, where the input signal of base station, BS, is an additive mixture of user signals and noise, where a signal of every user being a collection of independently fading path signals comprises the pilot component and info components received via the corresponding pilot and info channels, the amounts of info channels per user and data transmission rates varying in user info channels, comprising making soft decisions about the info parameters of signals of all the info channels of all the users by compensating the interfering effect of signals of all the paths of pilot and info channels of all the users on each other, the method comprising:
- a step in which a signal is searched by isolating the paths of maximum power signals from the detected signals of paths,a step in which the complex correlation responses of signals of all the isolated paths of info channels of all the users are formed,a step in which the complex correlated responses of signals of all the isolated paths of pilot channels of all the users are formed,a step in which the complex correlation responses of signals of each path of pilot channel of each user are accumulated within the corresponding accumulation time thus generating averaged complex correlation responses of signals of all the paths of pilot channels of all the users,a step in which the generated complex correlation responses of signals of all the paths of info channels of all the users and all the generated complex correlation responses of signals of all the paths of pilot and info channels of all the users are delayed so that while compensating their interfering effect on each other the estimates of this interfering effect be formed,a step in which the soft decisions about the info parameters of signals of all the info channels of all the users are formed successively in L iterations, where L—
the integer, greater than or equal to 1, where at each iteration the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on each other are formed and this interfering effect is compensated in the averaged complex correlation responses of signals of all the paths of pilot channels of all the users thus forming more accurate complex correlation responses of signals of all the paths of pilot channels of all the users,a step in which the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users are made and this interfering effect is compensated in complex correlation responses of signals of all the paths of info channels of all the users thus forming more accurate complex correlation responses of signals of all the paths of info channels of all the users,a step in which the estimates of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users are made and this interfering effect is compensated in more accurate complex correlation responses of signals of all the paths of pilot channels of all the users thus producing the estimates of complex envelopes of signals of all the paths of all the users,a step in which the soft decisions about the info parameters of signals of all the info channels of all the users are formed successively through Pl stages compensating the interfering effect of signals of all the paths of info channels of all the users on each other, l takes the integer values of 1 to L, l—
iteration number, where at the p-th stage, p takes the integer values of 1 to Pl,a step in which more accurate complex correlation responses of signals of all the paths of each info channel of each users, p being equal to one, or the complex correlation responses of signals of all the paths of info channels of the (p−
1)-th stage users, p being greater than one, are combined using the estimates of complex envelopes of signals of all the user paths thus forming soft decisions about the info parameters of signals of info channels of the p-th stage users,a step in which out of the generated soft decisions Kp maximum by modulo ones are selected and considered to be the final soft decisions about the info parameters of signals of info channels of the current iteration users,a step in which the estimates are made of the interfering effect of signals of all the paths of user info channels, corresponding to the selected soft decisions about the info parameters of signals of user info channels, on the remaining signals of all the paths of user info channels on which the final decision has not yet been made by this stage,a step in which this interfering effect is compensated in the remaining more accurate complex correlation responses of signals of all the paths of info channels of users, p being equal to one, or in the remaining complex correlation responses of signals of all the paths of info channels of the (p−
1)-th stage users, p being greater than one, thus forming complex correlation responses of signals of all the paths of info channels of the p-th stage users,a step in which at the last Pl-th stage the complex correlation responses of signals of all the paths of info channels of the Pl-th stage users, on which the final decision has not yet been made, are combined using the estimates of complex envelopes of signals of all paths of all users thus forming soft decisions about the info parameters of signals of info channels of the Pl-th stage users, which along with the final soft decisions about the info parameters of signals of user info channels of the previous stages are the final soft decisions about the info parameters of this iteration,a step in which the obtained soft decisions about the info parameters of signals of all the info channels of all the users and the estimates of complex envelopes of signals of all the paths of all the users of the current iteration, except the last one, that are delayed by the time of iteration, are used to generate the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users and the estimates of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users of the subsequent iteration,a step in which at the first iteration in order to generate the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on each other the averaged complex correlation responses of signals of all the paths of pilot channels of all the users are used, in order to generate the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users more accurate complex correlation responses of signals of all the paths of pilot channels of all the users are used, in order to generate the estimates of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users more accurate complex correlation responses of signals of all the paths of pilot and info channels of all the users are used, anda step in which the soft decisions about the info parameters of signals of all the info channels of all the users of the last iterations are the output signals for decision making.
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Abstract
The invention relates to radio engineering, more specifically to a method and a device for receiving multipath signals in a radio communications system with a code division multiple access (CDMA) and can be used for the receiving equipment of a base station. Said invention makes it possible to compensate a reciprocal signal interference of all user beams of information and pilot channels in a shaped complex cross-correlation response of all user beams of the information and pilot channels. The number of information channels and the data transmission rate in the information channels can vary from user to user. A serial compensation of the reciprocal signals interference of all user beams of the information and pilot channels during measurement of user signal parameters and complex waveform envelopes of all user beams is carried out in several iterations.
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Citations
21 Claims
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1. A method of multipath signal receiving in a CDMA mobile communications system, where the input signal of base station, BS, is an additive mixture of user signals and noise, where a signal of every user being a collection of independently fading path signals comprises the pilot component and info components received via the corresponding pilot and info channels, the amounts of info channels per user and data transmission rates varying in user info channels, comprising making soft decisions about the info parameters of signals of all the info channels of all the users by compensating the interfering effect of signals of all the paths of pilot and info channels of all the users on each other, the method comprising:
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a step in which a signal is searched by isolating the paths of maximum power signals from the detected signals of paths, a step in which the complex correlation responses of signals of all the isolated paths of info channels of all the users are formed, a step in which the complex correlated responses of signals of all the isolated paths of pilot channels of all the users are formed, a step in which the complex correlation responses of signals of each path of pilot channel of each user are accumulated within the corresponding accumulation time thus generating averaged complex correlation responses of signals of all the paths of pilot channels of all the users, a step in which the generated complex correlation responses of signals of all the paths of info channels of all the users and all the generated complex correlation responses of signals of all the paths of pilot and info channels of all the users are delayed so that while compensating their interfering effect on each other the estimates of this interfering effect be formed, a step in which the soft decisions about the info parameters of signals of all the info channels of all the users are formed successively in L iterations, where L—
the integer, greater than or equal to 1, where at each iteration the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on each other are formed and this interfering effect is compensated in the averaged complex correlation responses of signals of all the paths of pilot channels of all the users thus forming more accurate complex correlation responses of signals of all the paths of pilot channels of all the users,a step in which the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users are made and this interfering effect is compensated in complex correlation responses of signals of all the paths of info channels of all the users thus forming more accurate complex correlation responses of signals of all the paths of info channels of all the users, a step in which the estimates of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users are made and this interfering effect is compensated in more accurate complex correlation responses of signals of all the paths of pilot channels of all the users thus producing the estimates of complex envelopes of signals of all the paths of all the users, a step in which the soft decisions about the info parameters of signals of all the info channels of all the users are formed successively through Pl stages compensating the interfering effect of signals of all the paths of info channels of all the users on each other, l takes the integer values of 1 to L, l—
iteration number, where at the p-th stage, p takes the integer values of 1 to Pl,a step in which more accurate complex correlation responses of signals of all the paths of each info channel of each users, p being equal to one, or the complex correlation responses of signals of all the paths of info channels of the (p−
1)-th stage users, p being greater than one, are combined using the estimates of complex envelopes of signals of all the user paths thus forming soft decisions about the info parameters of signals of info channels of the p-th stage users,a step in which out of the generated soft decisions Kp maximum by modulo ones are selected and considered to be the final soft decisions about the info parameters of signals of info channels of the current iteration users, a step in which the estimates are made of the interfering effect of signals of all the paths of user info channels, corresponding to the selected soft decisions about the info parameters of signals of user info channels, on the remaining signals of all the paths of user info channels on which the final decision has not yet been made by this stage, a step in which this interfering effect is compensated in the remaining more accurate complex correlation responses of signals of all the paths of info channels of users, p being equal to one, or in the remaining complex correlation responses of signals of all the paths of info channels of the (p−
1)-th stage users, p being greater than one, thus forming complex correlation responses of signals of all the paths of info channels of the p-th stage users,a step in which at the last Pl-th stage the complex correlation responses of signals of all the paths of info channels of the Pl-th stage users, on which the final decision has not yet been made, are combined using the estimates of complex envelopes of signals of all paths of all users thus forming soft decisions about the info parameters of signals of info channels of the Pl-th stage users, which along with the final soft decisions about the info parameters of signals of user info channels of the previous stages are the final soft decisions about the info parameters of this iteration, a step in which the obtained soft decisions about the info parameters of signals of all the info channels of all the users and the estimates of complex envelopes of signals of all the paths of all the users of the current iteration, except the last one, that are delayed by the time of iteration, are used to generate the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users and the estimates of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users of the subsequent iteration, a step in which at the first iteration in order to generate the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on each other the averaged complex correlation responses of signals of all the paths of pilot channels of all the users are used, in order to generate the estimates of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users more accurate complex correlation responses of signals of all the paths of pilot channels of all the users are used, in order to generate the estimates of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users more accurate complex correlation responses of signals of all the paths of pilot and info channels of all the users are used, and a step in which the soft decisions about the info parameters of signals of all the info channels of all the users of the last iterations are the output signals for decision making. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device of multipath signal reception in a CDMA mobile communications system comprising:
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a demodulation unit that generates at the first outputs delayed complex correlation responses of signals of all the paths of info channels of all the users;
at the second outputs—
delayed complex correlation responses of signals of all the paths of pilot channels of all the users;
at the third outputs—
control signals;
at the fourth outputs—
elements of a matrix of cross-correlation of pseudo-range sequences of the pilot components of signals of all the paths of all the users to each other;
at the fourth outputs, the elements of cross-correlation matrix of the pseudo-noise sequences of the pilot components of signals of all the paths of all the users to the pseudo-noise sequences of the info components of signals of all the paths of all the users, the elements of cross-correlation matrix of the pseudo-noise sequences of the info components of signals all the paths of all the users to the pseudo-noise sequences of the pilot components of signals of all the paths of all the users, and the elements of cross-correlation matrix of the pseudo-noise sequences of the info components of signals of all the paths of all the users to each other;an accumulator of complex correlation responses of signals of each path of pilot channel of each user generating at the outputs averaged complex correlation responses of signals of all the paths of pilot channels of all the users; L−
1 first delay units, L−
1 second delay units, and L signal processing units, each generating soft decisions about the info parameters of signals of all the info channels of all the users at the first outputs, at the second outputs of each of them but last L-th signal processing unit generating the estimates of complex envelopes of signals of all the paths of all the users;
wherein first signal processing unit implements first method iteration, subsequent signal processing units along with corresponding first and second delay units implement subsequent method iterations;
the input of demodulation unit being a signal input of the device;
the first outputs of demodulation unit are linked to the first inputs of L signal processing units, to first signal processing unit directly and to the rest of signal processing units via corresponding first delay units and all the previous first delay units;
the second outputs of demodulation unit are connected to the inputs of accumulator whose outputs are joined with the second inputs of L signal processing units, to first signal processing unit directly and to the rest of signal processing units via corresponding first delay units and all the previous first delay units;
the first and second outputs of previous first delay unit are linked to the first and second inputs of subsequent delay unit;
the third outputs of demodulation unit are connected to the third inputs of L signal processing units;
the fourth outputs of demodulation unit are connected to the fourth inputs of L signal processing units, to first signal processing unit directly and to the rest of signal processing units via corresponding second delay units and all the previous second delay units;
the first outputs of previous second delay unit are connected to the fourth inputs of corresponding signal processing unit and to the first inputs of subsequent second delay unit;
the first and second outputs of previous signal processing unit are connected to the fifth and sixth inputs of subsequent signal processing unit via second delay unit corresponding to this subsequent signal processing unit;
the second and third inputs of second delay unit are linked to the first and second outputs of previous signal processing unit and the second and third outputs of second delay unit are linked to the fifth and sixth inputs of corresponding signal processing unit;
the outputs of the last L-th signal processing unit, the soft decisions about the info parameters of all signals of all the info channels of all the users, are outputs of the device;
each signal processing unit comprises;a sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other; a sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, a sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, and a sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other producing soft decisions about the info parameters of signals of all the info channels of all the users through Pl stages, where l—
signal processing unit number taking the integer values of 1 to L where;in the first signal processing unit; the first inputs are formed by the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, the second inputs are formed by the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the third inputs are formed by the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, and the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other, the fourth inputs are formed by the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, and the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other, where; the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, generating at these outputs more accurate complex correlation responses of signals of all the paths of pilot channels of all the users, are linked to the fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users and the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the user, generating at these outputs more accurate complex correlation responses of signals of all the paths of info channels of all the users, are connected to the fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users and to the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other, the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, generating at these outputs the estimates of complex envelopes of signals of all the paths of all the users, are joined with the fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other and are second outputs of first signal processing unit, the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other, generating at these outputs soft decisions about the info parameters of signals of all the info channels of all the users, are the first outputs of first signal processing unit, where in each subsequent l-th signal processing unit, l taking the integer values of 2 to L; the first inputs are formed by the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users; the second inputs are formed by the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the third inputs are formed by the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, and first inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other; the fourth inputs are formed by the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, the second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users and second inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other; the fifth inputs are formed by the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users; the sixth inputs are formed by the fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, the fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other and fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users; the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on each other, generating at these outputs more accurate complex correlation responses of signals of all the paths of pilot channels of all the users, are linked to the fifth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users;
the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of pilot channels of all the users on the signals of all the paths of info channels of all the users, generating at these outputs more accurate complex correlation responses of signals of all the paths of info channels of all the users, are linked to the third inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other;the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on the signals of all the paths of pilot channels of all the users, generating at these outputs the estimates of complex envelopes of signals of all the paths of all the users, are connected to the fourth inputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other and for each signal processing unit except the last, L-th, one are the second outputs; the outputs of sub-unit for compensation of the interfering effect of signals of all the paths of info channels of all the users on each other, generating at these outputs soft decisions about the info parameters of signals of all the info channels of all the users, are the first outputs of signal processing unit; and the outputs of the last L-th signal processing unit are the outputs of the device. - View Dependent Claims (20, 21)
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Specification