CN101977426A - Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater - Google Patents
Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater Download PDFInfo
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Abstract
The invention discloses a method for reducing the uplink noise of a GSM (Global System for Mobile Communications) digital repeater, which comprises the following steps of: processing an uplink GSM signal by a DDC (Direct Digital Control) module to obtain a baseband I/Q signal of each carrier wave; determining the border of each time slot of each carrier wave according to an uplink border indication pulse signal; and counting the powers of all time slots, if the power value is smaller than the threshold power value configured by an upper computer, considering the time slot as noise, and setting the baseband signal I/Q of the time slot to zero. The method is realized in a digital board of a remote computer, the uplink noise of the remote computer is eliminated, and the method can be used for eliminating the noise on an uplink useless channel.
Description
Technical field
The present invention relates to reduce the method for direct end uplink noise, mainly is a kind of method of upstream noise of the GSM of reduction digital high-frequency amplification station.
Background technology
Optical fiber repeater is good with its working stability, coverage effect, flexible etc. the advantage that designs and construct, and uses in repeater covering scheme and constantly increases.The covering scheme of optical fiber repeater generally is many forms of dragging, and just a near-end machine connects a plurality of remote terminations.Various topological structures is arranged: star-like, ring-like, bus-type etc.And ring-like and topological structure bus-type, make travelling carriage after the too much platform remote termination of upward signal warp of base station, signal can repeatedly be superposeed, especially the stack of noise, can have a strong impact on the useful signal on the same channel, cause seriously descending in the signal to noise ratio of base station side signal.
Summary of the invention
Purpose of the present invention will overcome the deficiency of above-mentioned technology just, and a kind of method of upstream noise of the GSM of reduction digital high-frequency amplification station is provided.
The present invention solves the technical scheme that its technical problem adopts:
In order to judge that up certain time slot of GSM signal is useful signal or noise (empty slot), need carry out power statistic to time slot, before power statistic, must find the border of time slot.Because the upward signal instability causes accurately detecting boundary of time slot.Therefore stable, glitch-free downstream signal have been adopted, as the detected object of boundary of time slot detection.Because the boundary of time slot at the GSM signal of the up-downgoing of base station side all aligns, utilize this characteristics, by the time-delay of calculation base station side between the boundary of time slot detection module of remote termination inside, reach the descending boundary of time slot that detects and be used for upward signal, as the boundary of time slot of upward signal.
The method of the upstream noise of this reduction GSM digital high-frequency amplification station, step is as follows: up GSM signal is after through the DDC module, obtain the baseband I/Q signal of each carrier wave, according to last row bound marker pulse signal, determine the border of each each time slot of carrier wave, and all time slots are carried out power statistic, if performance number is less than the threshold power value of host computer configuration, think that then this time slot is a noise, with the baseband signal I/Q zero setting of this time slot.
As preferably, this method has three main modular: boundary of time slot determination module, compensation of delay computing module, timeslot shutdown logic module; Boundary of time slot determination module: finish detection to the boundary of time slot of descending GSM signal.For the judgement of the boundary of time slot of upward signal provides reference.2. compensation of delay computing module: the calculation base station side suppresses time-delay between the processing module to the inner low noise of remote termination.This time-delay can compensate the time difference on descending boundary of time slot and ascending time slot border.3. timeslot shutdown logic module: this module is added up at the power of each time slot of finishing final each carrier wave of upward signal, compares with the time slot power threshold value, and whether decision closes this time slot (time slot power is 0).
(1), by the boundary of time slot detection module realize descending GSM signal boundary of time slot searching and determine: the I/Q data of coming from the CPRI module, carry out the computing of I^2+Q^2 (quadratic sum), obtain single sampled point performance number, the single-point performance number is sent into power statistic module and border judge module respectively, in the power statistic module, at T in the time, the single-point power of same carrier wave is added up, finish the calculating of carrier power; Under the situation of multicarrier, carrier power to all carrier waves is added up one by one, each carrier wave timing statistics is T, statistics performance number with each carrier wave is input to channel selecting module then, channel selecting module is by constantly comparing each carrier power, select the carrier wave of maximum power, carrier number is sent into the border judge module, the border judge module is judged the boundary of time slot of prominent carrier wave;
(2), suppress time-delay between the processing module by compensation of delay computing module calculation base station side to the low noise of remote termination: Cu_delay represents up time-delay, and d_delay represents line delay down.Suppose that the fiber delay time that the CPRI module calculates is fiber_delay, the hardware time-delay summation of the up-downgoing of near-end machine is near_delay, and near_delay_u, near_delay_d represent the hardware time-delay of the uplink and downlink of near-end machine respectively; Near_delay=near_delay_u+near_delay_d
Delay_all＝near_delay+2*fiber_delay+u_delay+d_delay。
U_d_delay＝one_slot_time-delay_all。
When known descending time slot edge, promptly descending low noise suppresses the module input, through time-delay u_d_delay, obtains up time slot edge so, and promptly up low noise suppresses module output; One_slot_time represents a time slots length, and delay_all represents that low noise suppresses the descending time-delay that is up to of module;
(3), finish the statistics of time slot power of each carrier wave of upward signal by the timeslot shutdown logic module, compare with threshold value, whether decision closes current time slots, time slot power is 0.
As preferably, border deterministic process: the power of single sampled point that the single-point power computation module is come, compare with signal threshold value, if single-point power continues to be higher than the time of signalc threshold in the thresholding of regulation, promptly want seeking time greater than the MIN minimum, want seeking time less than the MAX maximum, then lose pre-boundary pulses signal edge_pre, if all remain on 567us～587us between a plurality of edge_pre signals, output boundary is determined signal edge_sure so, and this signal is sent into module border generation module, and this module is utilized inner counter, can produce boundary pulses signal edge_pulse according to the edge_sure signal.
The effect that the present invention is useful is: realizing in the digiboard of remote termination, eliminated the upstream noise of remote termination, is a kind of method that can eliminate the noise on the up useless channel.
Description of drawings
Fig. 1 is an algoritic module block diagram of the present invention;
Fig. 2 is a time slot detection module module frame chart of the present invention;
Fig. 3 is a border detection algorithm schematic diagram of the present invention;
Fig. 4 is the topology diagram of optical fiber repeater of the present invention;
Fig. 5 is that the internal data of remote termination of the present invention flows to schematic diagram;
Fig. 6 is that the boundary of time slot that compensation of delay of the present invention calculates concerns schematic diagram;
Fig. 7 is a timeslot shutdown logic module block diagram of the present invention;
Fig. 8 is a timeslot shutdown logical algorithm schematic diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is an algoritic module block diagram of the present invention; This algorithm is in the digital baseband processing section of GSM digital optical fiber direct station remote termination, comprises DDC (digital lower side frequency), CPRI (common public radio interface), and this algorithm (low noise inhibition).This algorithm mainly divides three modules---boundary of time slot detection module, compensation of delay computing module, timeslot shutdown logic module.
Filled arrows be the GSM signal flow to, non-filled arrows all is logical signals such as control and indication among the figure.Downstream signal is by the CPRI module, finish the extraction of baseband I/Q signal (complex signal) and control word, i/q signal is input to after the boundary of time slot detection module, finished power statistic to each carrier wave of downstream signal, select the carrier wave of maximum power, and this carrier wave carried out the judgement on border, the output boundary marker pulse.Control word is input to the compensation of delay computing module, calculate this remote termination and near-end machine fiber delay time, near-end machine on/time-delay of descending hardware time-delay, remote termination itself etc.The delay time of this delay value control time delay module, the descending boundary marker pulse becomes the border marker pulse signal of upward signal through time delay module.Up GSM signal is after process DDC, obtain the baseband I/Q signal of each carrier wave, according to last row bound marker pulse signal, determine the border of each each time slot of carrier wave, and all time slots are carried out power statistic, if performance number thinks that then this time slot is noise (empty slot), with the baseband signal I/Q zero setting of this time slot less than the threshold power value of host computer configuration.Promptly eliminated the noise on the useless time slot, when avoiding a plurality of remote termination cascade, the stack of noise signal influences the signal to noise ratio of near-end machine received signal (upward signal).If performance number is greater than the threshold power value, the i/q signal that DDC is come passes through the CPRI module so.
Below each module is introduced the method for its realization separately:
1) boundary of time slot detection module: this module realize descending GSM signal boundary of time slot searching and determine.Its inside comprises 4 little modules, as shown in Figure 2: single-point power computation module, power statistic module, channel selecting module, border judge module.From the I/Q data that CPRI comes, carry out the computing of I^2+Q^2.Obtain single sampled point performance number (being called for short single-point power).The single-point performance number is sent into power statistic module and border judge module respectively, in the power statistic module, in the T time (1 second), the single-point power of same carrier wave is added up, finish the calculating of carrier power.Under the situation of multicarrier, carrier power to all carrier waves is added up one by one, each carrier wave timing statistics is T, statistics performance number with each carrier wave is input to channel selecting module then, channel selecting module is by constantly comparing each carrier power, select the carrier wave of maximum power, carrier number is sent into the border judge module.The border judge module is judged the boundary of time slot of prominent carrier wave, because power is big more, the border judges that stability is good more.
The border deterministic process is seen Fig. 3.The power of single sampled point that the single-point power computation module is come, compare with signal threshold value, if single-point power continues to be higher than the time of signalc threshold in the thresholding of regulation, promptly (minimum is wanted seeking time greater than MIN, be traditionally arranged to be 547us), (maximum is wanted seeking time less than MAX, be traditionally arranged to be 567us), then lose pre-boundary pulses signal edge_pre, if all remain on 567us～587us (about a slot time) between a plurality of edge_pre signals, output boundary is determined signal edge_sure so, this signal is sent into module border generation module, this module is utilized inner counter, can produce the boundary pulses signal edge_pulse of 577us equal time automatically according to the edge_sure signal.
2) compensation of delay computing module: the calculation base station side is to the time-delay between the low noise inhibition processing module of remote termination.The topological structure of general optical fiber repeater as shown in Figure 4, each remote termination carries out cascade by optical fiber, the S among the figure in the remote termination (Slave) expression is from end light mouth, the main end of M (Master) expression light mouth.The CPRI module can be calculated the fiber delay time from the near-end machine to this remote termination automatically.Can delay time for the signal of the emission that realizes each remote termination equates, so each remote termination all has descending time delay module, and for upward signal can arrive the near-end machine simultaneously, remote termination all has up time delay module, sees Fig. 5 equally.U_delay wherein represents up time-delay, and d_delay represents line delay down.Suppose that the fiber delay time that the CPRI module calculates is fiber_delay, the hardware time-delay summation of the up-downgoing of near-end machine is near_delay.The relation of GSM signal slot that suppresses the up-downgoing of end in low noise can be expressed as shown in Figure 6 so.Wherein near_delay_u, near_delay_d represent the hardware time-delay of the uplink and downlink of near-end machine respectively.So near_delay=near_delay_u+near_delay_d.As can be seen from the figure, when known descending time slot edge (descending low noise suppresses the module input),, just can obtain up time slot edge (up low noise suppresses module output) so through time-delay u_d_delay.One_slot_time among the figure represents a time slots length (577us), and delay_all represents that low noise suppresses the descending time-delay that is up to of module.
Delay_all＝near_delay+2*fiber_delay+u_delay+d_delay。
U_d_delay＝one_slot_time-delay_all。
Known at one_slot_time, near_delay can obtain a fixed in hardware value by the reality test, and fiber_delay, u_delay, d_delay obtain by CPRI module real-time testing.
3) timeslot shutdown logic module: finish the statistics of time slot power of each carrier wave of upward signal, compare with threshold value, whether decision closes current time slots.This module is made up of following submodule, as shown in Figure 7: counter controls module, short-time rating statistics and comparison module, switching logic.Signal after the remote termination DDC, the timeslot shutdown that carries out that all carrier waves are all independent is handled, and the processing mode of each carrier wave is all identical.Here describe at a carrier wave.After carrier wave entered into short-time rating statistics and comparison module, outside border marker pulse had been determined the time of power statistic and the time span of statistics by the counter controls module.In order correctly to reflect the power of current time slots during the beginning of guaranteed output statistics, after the border marker pulse arrives, current power is not added up, at once just but begin statistics after a period of time of having delayed time.As shown in Figure 8.After the statistics beginning, adopt the short-time rating statistics, just every 5us carries out power statistic one time.This is in order to guarantee to judge fast this time slot power whether on threshold power, and the result who reaches current judgement acts on current time slots.Can see among Fig. 8 that the time slot switching signal will be at SLOT signal (single-carrier signal after the DDC) afterwards.In order to ensure the integrality of signal, will carry out suitable time-delay to the SLOT signal, make time slot just within switching signal.In the switching logic module, in a whole time slot, after time slot is judged as out, just can't turn-off this time slot.This is in order to guarantee not lose a kind of assurance mechanism of useful signal.
Result among Fig. 8 shows: because first time slot power of SLOT is greater than threshold value, and second time slot is less than threshold value.Therefore second time slot is closed.Realized the method for the upstream noise of elimination GSM optical fiber frequency-selective digital repeater.
In addition to the implementation, all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.
Claims (3)
1. method that reduces the upstream noise of GSM digital high-frequency amplification station, it is characterized in that: step is as follows: up GSM signal is after through the DDC module, obtain the baseband I/Q signal of each carrier wave, according to last row bound marker pulse signal, determine the border of each each time slot of carrier wave, and all time slots are carried out power statistic, if performance number is less than the threshold power value of host computer configuration, think that then this time slot is a noise, with the baseband signal I/Q zero setting of this time slot.
2. the method for the upstream noise of reduction GSM digital high-frequency amplification station according to claim 1 is characterized in that:
(1), by the boundary of time slot detection module realize descending GSM signal boundary of time slot searching and determine: the I/Q data of coming from the CPRI module, carry out the computing of I^2+Q^2, obtain single sampled point performance number, the single-point performance number is sent into power statistic module and border judge module respectively, in the power statistic module, at T in the time, the single-point power of same carrier wave is added up, finish the calculating of carrier power; Under the situation of multicarrier, carrier power to all carrier waves is added up one by one, each carrier wave timing statistics is T, statistics performance number with each carrier wave is input to channel selecting module then, channel selecting module is by constantly comparing each carrier power, select the carrier wave of maximum power, carrier number is sent into the border judge module, the border judge module is judged the boundary of time slot of prominent carrier wave;
(2), suppress time-delay between the processing module by compensation of delay computing module calculation base station side to the low noise of remote termination: Cu_delay represents up time-delay, and d_delay represents line delay down.Suppose that the fiber delay time that the CPRI module calculates is fiber_delay, the hardware time-delay summation of the up-downgoing of near-end machine is near_delay, and near_delay_u, near_delay_d represent the hardware time-delay of the uplink and downlink of near-end machine respectively; Near_delay=near_delay_u+near_delay_d
Delay_all＝near_delay+2*fiber_delay+u_delay+d_delay。
U_d_delay＝one_slot_time-delay_all。
When known descending time slot edge, promptly descending low noise suppresses the module input, through time-delay u_d_delay, obtains up time slot edge so, and promptly up low noise suppresses module output; One_slot_time represents a time slots length, and delay_all represents that low noise suppresses the descending time-delay that is up to of module;
(3), finish the statistics of time slot power of each carrier wave of upward signal by the timeslot shutdown logic module, compare with threshold value, whether decision closes current time slots, time slot power is 0.
3. the method for the upstream noise of reduction GSM digital high-frequency amplification station according to claim 2, it is characterized in that: the border deterministic process: the power of single sampled point that the single-point power computation module is come, compare with signal threshold value, if single-point power continues to be higher than the time of signalc threshold in the thresholding of regulation, promptly want seeking time greater than the MIN minimum, want seeking time less than the MAX maximum, then lose pre-boundary pulses signal edge_pre, if all remain on 567us～587us between a plurality of edge_pre signals, output boundary is determined signal edge_sure so, this signal is sent into module border generation module, this module is utilized inner counter, can produce boundary pulses signal edge_pulse according to the edge_sure signal.
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