CN1269324C - SIR measuring method and device for WCDMA system up-link - Google Patents
SIR measuring method and device for WCDMA system up-link Download PDFInfo
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Abstract
The present invention discloses an SIR measuring method for an uplink of a code division multiple access system in the field of mobile communication. Firstly, at a receiving terminal of a base station, the M antenna of a certain user respectively outputs DPCCH de-spread signals of N single paths after searched and demodulated, the de-spread signals are input into SIR measuring modules of single paths, and signals of MxN single paths and interfering noise power can be measured; then, the obtained the instantaneous signal power of the MxN single paths and the average noise interference power of M most powerful paths in the k time slot are input into an SIR combiner to be processed; the instantaneous signal power of all the single paths are averaged, the average noise interference power of the M most powerful paths are averaged, and the up SIR measured value sir (k) of the user in the K time slot can be obtained accordingly. The present invention overcomes the defects that the real time of the SIR measurement can not be satisfied, the accuracy of the, SIR measurement is not good, the measurement is seriously influenced by channel estimation, etc. The requirements of real time, accuracy, etc. of the SIR measurement are satisfied simultaneously.
Description
Technical field:
The present invention relates to the Wideband Code Division Multiple Access (WCDMA) mobile communcations system, relate in particular to interior ring SIR (the Signal toInterference Ratio in the control of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system up-link power, signal-to-jamming ratio is called for short signal interference ratio) method of measurement and device.
Background technology:
Code division multiple access (CDMA) system is a frequency self-interference system together, the shared same frequency band of a plurality of users, pass through pseudo noise code (a kind of binary sequence between each user, produce by some shift registers, the appearance of sequence numerical value is at random on the surface, but sequence numerical value is determined by shift register structure in fact, in cdma system, be also referred to as " spreading code " or " scrambler ") distinguish, but because the nonorthogonality of pseudo noise code, the signal of each user's emission all will produce interference to other users, and promptly usually said multiple access disturbs.Except multiple access disturbs the harmful effect that causes, also exist the influence of " near-far interference ", promptly in up link, if all subscriber units (UE:User Equipment in the sub-district, in wireless communication system, the mobile phone that radio communication function is arranged that the user uses, equipment such as palmtop PC all are UE, all travelling carriages all are UE) transmitting power identical, and each subscriber unit (UE) and NodeB (Node B: Node B, in cdma system, Node B refers to a kind of base station in the wireless communication system, is responsible for the receiving mobile signal, transmits to travelling carriage) distance is different, thereby cause the base station strong from the signal that near the travelling carriage it receives, and receive a little less than the signal of remote travelling carriage, cause weak signal to be submerged in the strong signal, make that the certain customers unit can't operate as normal.In addition in the radio wave propagation process, run into the problem of " shadow effect " through regular meeting, must the real time altering transmitting power, could guarantee at this regional communication quality.Power control techniques can solve above-mentioned several problem, is to make cdma system move towards one of important key technology of practicability.
At up (oppositely) link channel, the reception SIR (useful signal that receives and the ratio that is mixed in the interference noise on the useful signal) that the base station arrives the base station by measuring each travelling carriage, the target SIR given with outer shroud compares, produce power control command, transmitting power with the control travelling carriage, thereby make travelling carriage emission and remain on the target SIR that outer shroud provides, and then consistent quality of service is provided in the coverage at the SIR that the base station receives.This shows that sir measurement is the foundation stone of power control, the whether accurate of sir measurement will directly influence the quality of power control performance, thereby influence the capacity of sub-district, influence the overall performance of mobile communication system.Therefore the research work of sir measurement has obtained various countries scholars' attention always, and many relevant patents are also arranged, but because the complexity of wireless channel, the existing technology part that all more or less comes with some shortcomings.
The patent No. is 99117210.8 the Chinese patent SIR estimating and measuring method and the device of non-continuous pilot frequency " among the WCDMA based on ", with DPCCH (Dedicated Physical ControlChannel, Dedicated Physical Control Channel) carry out bit separation after, calculate the energy of non-frequency pilot sign wherein, and after 1-15 time slot is average, obtain the power of signal section; Poor with the average power of measuring single time-multiplexed pilot symbol and power that channel estimating obtains, as the average interference power of single time-multiplexed pilot symbol, after the Filtering Processing as the power of interference sections.Though the method is used the symbol of whole DPCCH, frequency pilot sign wherein but only is used as the size of calculating interference power, and it is not used for the power of signal calculated, fails to give full play to the effect of pilot portion.And only utilize the power of non-pilot portion signal calculated, its accuracy also can be greatly affected.In addition,, be equivalent to artificially prolong the Loop Round Trip Time of power control, be not used in power control, especially influenced the performance of power control under the rapid fading owing to when signal calculated power, adopted the Filtering Processing of 1-15 time slot.Moreover, because when calculating interference power, used average estimated channel power, so the inevitable influence that is subjected to the channel estimating quality again of the method.
The patent No. is that 01100364.2 Chinese patent " signal-to-jamming ratio (SIR) method of measurement " has proposed the method for measurement that a kind of application Common Pilot Channel (CPICH, Common Pilot Channel, Common Pilot Channel) is calculated SIR.This method after receiving terminal is with despreading common pilot symbols and known common pilot symbols carry out channel estimating, then channel estimation value of the resultant end is carried out channel compensation to the insertion frequency pilot sign of DPCH, thereby realizes sir measurement.There are 2 deficiencies in this method, and the one, because the power of Common Pilot Channel by the high level configuration, generally all immobilizes in for a long time or changes very little.And DPCH is that every time slot changes owing to be subjected to the effect of power control, is very huge and become its variable power.Spreading gain owing to both differs widely in addition, fixing 256 the spreading factor that adopts of Common Pilot Channel, and dedicated pilot (channel) adopts variable spreading factor, therefore there is bigger difference in both decline situations, therefore the channel estimating that obtains with common pilot symbols is come that dedicated pilot symbol is carried out channel compensation and is inaccurate, and will have certain channel estimation bias.In addition, this method does not propose the concrete signal power and the method for measurement of interference power, does not utilize non-pilot portion yet, thereby makes measurement effect obviously reduce.
U.S. Pat 006028894 " SIR or SIR Measurement Apparatus " (signal interference ratio and signal-to-interference ratio measurement device) utilizes the average of pilot signal and variance to ask the power of signal and the power of interference respectively.Thisly ask the method for interference power to have generality, but this method has all been taked identical filtering average treatment to signal with disturbing, and can't satisfy the real-time requirement of sir measurement, considerable influence has been arranged for the performance of power control under the rapid fading with variance.
U.S. Pat 006438362 " Method and Apparatus for SIRMeasurement " (signal-to-interference ratio measurement method and apparatus) has proposed a kind of method of estimating interference power, promptly estimates that with pilot bits of exporting after the demodulation and channel the pilot bits of back output subtracts each other the value of calculating interference power.This interference detecting method has certain novelty theoretically, but its accuracy is subjected to the influence of channel estimating quality very big, in case when channel circumstance is relatively more abominable, channel estimation error will be bigger, will have influence on the estimation of interference power, thereby influence the accuracy of sir measurement.
Chinese patent NO.01136726.1 " the sir measurement method and apparatus of WCDMA up (oppositely) link " has proposed the sir measurement method before a kind of RAKE merges.Before RAKE merges the signal from different paths is carried out separately sir measurement respectively, the total SIR of received signal is each path signal SIR sum.This method has certain advance, has avoided the introducing channel estimation error, helps improving the precision of sir measurement.But also there are following 2 deficiencies in this method, and one is because this method has only adopted pilot bits to be used for estimating, presses the 3GPP agreement, has multiple time slot format, and the pilot bits number in corresponding each time slot does not wait from 3-8 yet.Like this, when pilot bits is fewer, only utilize the method for pilot bits, its certainty of measurement just may can not get guaranteeing.In addition, when calculating interference power, adopted and the similar method of aforementioned patent (US006438362), the pilot bits of the single footpath demodulation of utilization and single directly difference of channel estimating are calculated the size of interference power, its accuracy is subjected to the influence of channel estimating quality also very big, in case when channel circumstance is relatively more abominable, channel estimation error will be bigger, will have influence on the estimation of interference power, thereby influence the accuracy of sir measurement.
Summary of the invention:
The objective of the invention is to overcome the real-time that can't satisfy sir measurement, the sir measurement poor accuracy that exist in the prior art, be subjected to channel estimating to influence shortcomings such as serious, up link sir measurement method and apparatus in a kind of code division multiple access system is proposed, in the hope of the requirement of aspects such as the real-time that satisfies sir measurement simultaneously, accuracy.
For achieving the above object, the present invention has constructed a kind of sir measurement device of CDMA system uplink, comprise M * N pilot bits separator, M * N pilot tone relevant device, a M noise average filter and a SIR combiner, it is characterized in that, also comprise M * N single footpath instantaneous signal power checker, a M most powerful path instantaneous noise interferometry device;
After DPCCH symbolic information after each bar footpath despreading is imported described pilot bits separator, by described pilot bits separator the DPCCH symbolic information is divided into pilot tone and non-pilot tone two classes, pilot tone is outputed to the relevant device of described pilot tone, non-pilot tone is outputed to described single footpath instantaneous signal power checker;
After the relevant device of described pilot tone receives frequency pilot sign, multiply each other with the frequency pilot sign of known pilot symbols and input, what output obtained is long-pending to described single directly instantaneous signal power checker and described most powerful path instantaneous noise power checker;
Described single footpath instantaneous signal power checker comprises pilot field part, non-pilot field part and adder (510), described adder (510) is the result addition of pilot field and non-pilot field, that obtain and as described single footpath instantaneous signal power checker (403.11,403.1N ..., 403.M1,, described SIR combiner is sent in output 403.MN);
The output result of described most powerful path instantaneous noise interferometry device inputs to described SIR combiner after by the filtering of described noise average filter;
Described single footpath instantaneous signal power checker comprises pilot field part, non-pilot field part and adder 510; Pilot field partly comprises the integral mean device, real part is asked die device, squarer, multiplier, above-mentioned device is connected in series in turn, and frequency pilot sign is averaged, and the real part that obtains the result carries out square, square the result multiply by a weights p, what obtain long-pendingly is sent to described adder; Non-pilot field partly comprises real part and asks die device, squarer, integral mean device, subtracter and multiplier, above-mentioned device is connected in series in turn, the real part of non-frequency pilot sign is carried out square, and to square the result ask average, value after average deducts 1, difference multiply by weights (1-p), and what obtain long-pendingly is sent to described adder; Described adder is the result addition of pilot field and non-pilot field, obtain and as the output of single footpath instantaneous signal power checker;
Described most powerful path instantaneous noise interferometry device comprises that delayer, subtracter, plural number ask die device and integral mean device; The output pilot signal of the relevant device of the pilot tone in the every day line in the energy maximum diameter is sent into described most powerful path instantaneous noise interferometry device respectively, and these frequency pilot signs are sent into described delayer on the one hand, sends into described subtracter on the one hand; Described delayer is sent into described subtracter after symbol time of data time-delays; Described subtracter deducts the data of time-delay with the data of not time-delay, the difference that obtains is sent to described plural number and asks die device, described plural number is asked the mould value result of mould to be sent to described integral mean device and is averaged, averaged result is sent to described noise average filter as the output of described most powerful path instantaneous noise interferometry device;
Described noise average filter comprises two multipliers, adder, multiplier and delayers; After at first Shu Ru noise jamming measurement result was sent to described two multipliers, (1-α) multiplied each other with coefficient, and what obtain long-pendingly is sent to described adder; Described adder is the long-pending addition of described two multipliers, what obtain is sent to described SIR combiner with one side as the output of described noise average filter, be sent to described delayer on the one hand, described delayer is sending into described second multiplier after the data time-delay once, multiply by factor alpha, what obtain long-pendingly is sent to described adder;
Described SIR combiner is input signal the instantaneous signal power results of each all Dan Jing of antenna and the noise average filter result of each antenna most powerful path, the SIR combiner averages the instantaneous signal power results of each all Dan Jing of antenna, the noise average filter result of each antenna most powerful path is averaged, again the former average result divided by latter's average result, promptly obtain sir value output.
The invention allows for a kind of sir measurement method of CDMA system uplink, it is characterized in that, may further comprise the steps:
Suppose that the diversity antenna number is M, every day, line multipath number was N;
Step 1: at the base station receiving terminal, with certain user M strip antenna through search, after the demodulation, export the DPCCH despread signal of N bar Dan Jing respectively, these despread signal are input in the sir measurement module of single footpath, and parallel signal and the interference noise power that carries out M * N bar Dan Jing measured;
(1) the DPCCH despread signal of the signal power measurement of Dan Jing: Dan Jing is after pilot bits separates, pilot portion is wherein done relevant the processing, and be input in the single drive signal power checker with the isolated non-pilot bits part of pilot bits, measure directly K time slot instantaneous signal power of this list
(2) interference noise power of each antenna most powerful path is measured (interference noise in other footpath does not need to measure): the isolated whole pilot bits of each antenna most powerful path are input in the noise jamming measuring appliance, calculate the instantaneous noise interference power of each antenna most powerful path
(3) the instantaneous noise interference power that (2) are obtained is input to instantaneous noise interference power that noise average filter and previous time slot obtain and is weighted on average that (weights such as previous time slot are a, 0＜a＜1, then current weights are 1-a, both multiply each other with corresponding weights respectively, the long-pending addition again that obtains gets final product), obtain K time slot most powerful path average noise interference power I
PILOT, M1(k);
Step 2: the instantaneous signal power of K the time slot of the M that is obtained by step 1 * N bar Dan Jing and M most powerful path average noise interference power be input in the SIR combiner handle, the instantaneous signal power of each bar Dan Jing is averaged, M most powerful path average noise interference power averaged, the former averaged result promptly obtains the up sir measurement value SIR (k) of K time slot of this user divided by latter's average result.
The present invention is applied to all pilot tones and the non-frequency pilot sign of DPCCH in the sir measurement, has improved the certainty of measurement of SIR, has especially guaranteed in pilot bits number certainty of measurement more after a little while.Meanwhile, estimate owing to adopt difference method that pilot bits is carried out noise jamming, thoroughly avoided the influence of channel estimation errors, when Dan Jing being carried out the SIR merging sir measurement, only add up the noise-plus-interference power of each antenna most powerful path, can improve the certainty of measurement of noise jamming.In addition, the present invention has only calculated solid part signal power when signal calculated power, thereby avoids and will improve the precision of sir measurement in the imaginary part interference calculation signal effectively, has guaranteed the precision maneuver of power control, has correspondingly improved the capacity of system.
Description of drawings:
Fig. 1 is the frame assumption diagram of WCDMA system up-link DPCH DPCH.
Fig. 2 is closed power control and exterior ring power control structure block diagram.
Fig. 3 is the sir measurement method flow diagram of CDMA system uplink of the present invention.
Fig. 4 is the sir measurement structure drawing of device of CDMA system uplink of the present invention.
Fig. 5 is single footpath of the present invention instantaneous signal power checker detailed structure view.
Fig. 6 is the detailed structure view of most powerful path instantaneous noise interference power measuring appliance of the present invention and noise average filter.
Embodiment:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Fig. 1 is the frame assumption diagram of WCDMA system up-link DPCH DPCH.The present invention just is based on this frame structure and carries out sir measurement.The frame structure that the present invention is based on the WCDMA uplink dedicated physical channels DPCH of 3GPP agreement regulation is measured, DPCH DPCH is by Dedicated Physical Data Channel (DPDCH) and Dedicated Physical Control Channel (DPCCH) time division multiplexing, the transformat combination indication), FBI (Feedback Information: non-pilot field such as feedback information) the present invention utilizes DPCCH to carry out sir measurement exactly, and it comprises frequency pilot sign territory and TPC, TFCI (Transport Format Combination Indicator:.Press 3GPP agreement regulation, DPCCH adopts 256 spreading factor, always has 10 bits.Wherein frequency pilot sign PILOT number does not wait (by the time slot format configuration) from 3-8 is individual, and the present invention utilizes frequency pilot sign and non-frequency pilot sign to carry out sir measurement exactly.
The power control that the WCDMA system relates to comprises control of uplink and downlink inner loop power and the control of uplink and downlink exterior ring power, and its complete power control flow as shown in Figure 2.In the 3GPP agreement, stipulated the flow process of whole up link, travelling carriage at first carries out Base-Band Processing to the information that needs send, comprise add CRC (201), carry out total convolution or TURBO coding 202, interweave 203, spread spectrum (204.1 and 204.2), scrambling 206, I, Q two-way pulse shaping (207.1 and 207.2), modulation 208, send into power amplifier 209 emissions again.
At the base station receiving terminal, comprise 212 fens DPDCH of demodulation 211, descrambling and de-spreading and the output of DPCCH two-way through opposite processing, wherein DPCCH just is input in the sir measurement module 221 of the present invention's realization, after measuring the sir value of K time slot, the target SIR 220 that provides with outer shroud compares, send decision device 222 to adjudicate again, (TransmitPower Control: transmitting power control) order 223, the transmitting power size that travelling carriage is used for control power amplifiers 209 is given in the TPC territory of insertion downlink frame to produce TPC then.Thereby realize up inner loop power control.In addition, the DPDCH that exports behind the descrambling and de-spreading sends into RAKE combiner 213, carrying out a series of multipaths handles, obtain decoding data through decoder 214, in outer loop process, the result after the decoding is carried out frame error detection 215, (Frame Error Rate: frame error rate) 217 target frame error rates that provide compare, and produce target SIR 220, send and target SIR 220 with target FER after low pass filter 216 Filtering Processing.In fact, the main internally ring of the present invention SIR measures, and non-pilot field is incorporated into sir measurement, has increased the measurement sample, can effectively improve the precision of sir measurement, has especially solved pilot tone number certainty of measurement problem more after a little while.The interior ring sir measurement method and apparatus that the present invention is realized is applied in the power control, can produce TPC order more accurately, improves the precision of inner loop power control greatly, thereby further improves the capacity of system.
Fig. 3 is the flow chart of the method for the invention.Dashed rectangle 301 corresponding method steps 1, step 1 can be divided into 3 aspect contents (1), (2), (3) again, the corresponding solid line boxes 301.1 of difference, 302.3 and 301.3, the 301.1 main signal powers of calculating each bar Dan Jing wherein, square frame 301.2 calculates the interference noise power of each antenna most powerful path, and square frame 301.3 is weighted the noise-plus-interference power result of instantaneous noise interference power and previous time slot on average, as the noise-plus-interference power of current time slots.Step 2 in solid line boxes 302 corresponding method, the instantaneous signal power of each bar Dan Jing that step 1 is obtained averages, M the most powerful path average noise interference power that step 1 is obtained averages, the former averaged result promptly obtains the up sir measurement value of K time slot of this user divided by latter's average result.
Fig. 4 has provided sir measurement device of the present invention, comprise M * N pilot bits separator (401.11 ... 401.1N ..., 401.M1,, 401, MN), the relevant device (402.11 of pilot tone,, 402.1N ... 402.M1 ..., 402.MN), single footpath instantaneous signal power checker (403.11,403.1N ..., 403.M1,403.MN), a M most powerful path instantaneous noise interferometry device (404.1 ..., 404.M), a M noise average filter (406.1,, 406.M) with a SIR combiner 405.Fig. 5 has described single footpath instantaneous signal power checker concrete structure.Fig. 6 has described the detailed structure of most powerful path instantaneous noise interference power measuring appliance of the present invention and noise average filter.
Described pilot bits separator 401, input signal are the DPCCH symbolic information after each bar footpath despreading, the DPCCH symbolic information are divided into two classes: pilot tone and non-pilot tone.Pilot tone is exported, be sent to the relevant device 402 of pilot tone,, be sent to single footpath instantaneous signal power checker 403 non-pilot tone output.
The described pilot tone device 402.11 that is concerned with ..., 402.1N ... 402.M1 ..., 402.MN, input signal is the isolated frequency pilot sign of pilot bits separator, multiplies each other the long-pending output that obtains with known pilot symbols and input frequency pilot sign, be sent to corresponding single footpath instantaneous signal power checker 403.11 ..., 403.1N,, 403.M1 ... 403.MN) and corresponding most powerful path instantaneous noise power checker 404.1 ..., 404.M.Described single footpath instantaneous signal power checker 403 utilizes the pilot tone of relevant device 402 outputs of pilot tone and the non-frequency pilot sign of pilot bits separator 401 outputs to calculate single drive signal power, the output of single drive signal power, is sent to SIR combiner 405.
Single footpath instantaneous signal power checker comprises pilot field part, non-pilot field part and adder 510.Pilot portion comprises integral mean device 506, real part is asked die device 507, squarer 508, multiplier 509, these devices are docile and obedient preface serial connection, and frequency pilot sign is averaged, and the real part that obtains the result carries out square, square the result multiply by a weights p, the long-pending adder 510 that is sent to that obtains.Non-pilot portion comprises real part and asks die device 501, squarer 502, integral mean device 503, subtracter 504, multiplier 505.These devices are docile and obedient preface serial connection, the real part of non-frequency pilot sign is carried out square, and to square the result ask on average, on average the value after deducts 1 (adding-1), difference multiply by weights (1-p), the long-pending adder 510 that is sent to that obtains.Adder 510 is the result addition of pilot field and non-pilot field, obtain and as the output of single footpath instantaneous signal power checker.
Described most powerful path instantaneous noise interferometry device 404 comprises that delayer 601, subtracter 602, plural number ask die device 603 and integral mean device 604.The relevant device of pilot tone in the every day line in the energy maximum diameter (such as 402.11 ..., output pilot signal 402.M1) is sent into most powerful path instantaneous noise interferometry device (404.1 respectively, 404.M), these frequency pilot signs are sent into delayer 601 on the one hand, send into subtracter 602 on the one hand.Delayer is sent into subtracter 602 after symbol time of data time-delays.The data that subtracter 602 usefulness are not delayed time deduct the data of time-delay, the difference that obtains is sent to plural number and asks die device 603, plural number is asked the mould value result of mould to be sent to integral mean device 604 and is averaged, averaged result is sent to noise average filter 406 as the output of most powerful path instantaneous noise interferometry device 404.
Described noise average filter 406 comprises: multiplier 605, adder 606, multiplier 608 and delayer 607.At first Shu Ru noise jamming measurement result is sent to multiplier 605 and multiplies each other the long-pending adder 606 that is sent to that obtains with coefficient (1-α).Adder 606 is the long-pending addition of multiplier 605 and multiplier 608, what obtain is sent to SIR combiner 405 with one side as the output of noise average filter 406, be sent to delayer 607 on the one hand, delayer 607 multiply by factor alpha, the long-pending adder 606 that is sent to that obtains sending into multiplier 608 after the data time-delay once.The noise average filter result of the instantaneous signal power results of each all Dan Jing of antenna and each antenna most powerful path imports described SIR combiner (405), described SIR combiner (405) averages the instantaneous signal power results of each all Dan Jing of antenna, the noise average filter result of each antenna most powerful path is averaged, again the former average result divided by latter's average result, promptly obtain sir value output.
Below describe the processing procedure (the 1st footpath with certain user's the 1st antenna is example) of whole sir measurement in detail: 10 DPCCH symbols in every footpath, through pilot bits separator 401.11, export the individual non-pilot bits of Np pilot bits and 10-Np respectively.Wherein (S-Np) individual non-pilot bits is input to real part to be asked in the die device 501,3≤S≤10 wherein, generally get representative value 6, ask and send into squarer 502 again behind the mould and obtain square value, and then send into the integral mean that carries out (S-Np) individual non-frequency pilot sign in the integral mean device 503.Send back multiplier 505 again after subtracter 504 subtracts 1, the value that obtains after the factor (1-p) multiplies each other is sent in the adder 510 with the value that pilot field obtains.
On another road, separate the whole pilot bits that obtain through pilot bits separator 401.11 and be input to and carry out bit in the relevant device 402.11 of pilot tone and multiply each other, divide two-way then:
One the tunnel delivers in the symbolic integration averager 506 S or Np frequency pilot sign is carried out integral mean (if S＞Np, then Np frequency pilot sign carried out integration, otherwise S frequency pilot sign carried out integration), be sent to real part behind the integration and ask die device 507, ask and send into squarer 508 behind the mould and ask square, multiply each other with factor p through multiplier 509 again, be input in the adder 510 with non-pilot portion at last, obtain single footpath instantaneous signal power measurement values S
11
Another road is input in delayer 601 and the subtracter 602 as minuend, subtract each other with the value of the previous K-1 time slot of delayer 601 output, after send into plural number and ask die device 603 to ask the modulus of complex number, carry out integral mean through 604 pairs of Np symbols of symbolic integration averager again, obtain the instantaneous noise interference measure of K the time slot in single footpath, the multiplier 605 that is sent to again in the noise jamming averager 406.1 multiplies each other with (1-α), the result sends in the adder 606 and does summand, the average noise interference measure of previous K-1 time slot in another multiplier 608 (promptly the output result by last time slot adder 606 passes through 1 time slot of delayer 607 time-delays) multiplies each other with filtering factor α, and the result sends into adder 606 and makes addition; Adder 606 obtains the average noise interference power N of K the time slot in single footpath
11Here α filtering factor, value generally gets 0.98 or 0.95 between (0,1), in order to smothing filtering is carried out in the fluctuation that causes because of power control, eliminate the influence of power control to low noise as far as possible.
Similarly, similar processing is also done in all the other each footpaths, wherein only needs to measure the noise jamming average power of line most powerful path every day.After obtaining the instantaneous signal power and most powerful path noise jamming average power of each bar Dan Jing like this, be input to together in the SIR combiner 405, SIR combiner 405 averages the instantaneous signal power results of each all Dan Jing of antenna, the noise average filter result of each antenna most powerful path is averaged, again the former average result divided by latter's average result, obtain the sir measurement value of K time slot of this user.
Claims (7)
1, a kind of sir measurement device of CDMA system uplink, comprise M * N pilot bits separator (401.11 ..., 401.1N ..., 401.M1, ..., 401.MN), the relevant device of MxN pilot tone (402.11 ..., 402.1N ..., 402.M1, ..., 402.MN), M noise average filter (406.1 ..., 406.M) and a SIR combiner (405), it is characterized in that, also comprise M * N single footpath instantaneous signal power checker (403.11, ..., 403.1N ..., 403.M1, ..., 403.MN), M most powerful path instantaneous noise interferometry device (404.1 ..., 404.M);
DPCCH symbolic information after the footpath despreading of each bar import described pilot bits separator (401.11 ..., 401.1N, ..., 401.M1 ..., 401.MN) after, by described pilot bits separator (401.11 ..., 401.1N ..., 401.M1, ..., 401.MN) the DPCCH symbolic information is divided into pilot tone and non-pilot tone two classes, pilot tone is outputed to the relevant device (402.11 of described pilot tone, ..., 402.1N ..., 402.M1 ..., 402.MN), non-pilot tone output to described single footpath instantaneous signal power checker (403.11 ..., 403.1N, ..., 403.M1 ..., 403.MN);
Described pilot tone be concerned with device (402.11 ..., 402.1N, ..., 402.M1 ..., 402.MN) receive frequency pilot sign after, multiply each other with the frequency pilot sign of known pilot symbols and input, what output obtained is long-pending to described single footpath instantaneous signal power checker (403.11, ..., 403.1N ..., 403.M1 ..., 403.MN) with described most powerful path instantaneous noise power checker (404.1, ..., 404.M); Described single footpath instantaneous signal power checker (403.11 ..., 403.1N, ..., 403.M1 ..., 403.MN) comprise pilot field part, non-pilot field part and adder (510), described adder (510) is the result addition of pilot field and non-pilot field, obtain and as described single footpath instantaneous signal power checker (403.11, ..., 403.1N ..., 403.M1, ..., described SIR combiner (405) is sent in output 403.MN);
Described most powerful path instantaneous noise interferometry device (404.1, ..., 404.M) comprising that delayer (601), subtracter (602), plural number ask die device (603) and integral mean device (604), described delayer (601) is sent into described subtracter (602) after symbol time of data time-delay; Described subtracter (602) deducts the data of time-delay with the data of not time-delay, the difference that obtains is sent to described plural number and asks die device (603), described plural number is asked the mould value result of die device (603) to be sent to described integral mean device (604) and is averaged, averaged result is as described most powerful path instantaneous noise interferometry device (406.1, ..., output 406.M);
The output result of described most powerful path instantaneous noise interferometry device inputs to described SIR combiner after by the filtering of described noise average filter;
Wherein the diversity antenna number is M, and every day, line multipath number was N.
2, the sir measurement device of CDMA system uplink according to claim 1, it is characterized in that, pilot field partly comprises integral mean device (506), real part is asked die device (507), squarer (508), multiplier (509), above-mentioned device is connected in series in turn, frequency pilot sign is averaged, the real part that obtains the result carries out square, square the result multiply by a weights p, the long-pending described adder (510) that is sent to that obtains; Non-pilot field partly comprises real part and asks die device (501), squarer (502), integral mean device (503), subtracter (504) and multiplier (505), above-mentioned device is connected in series in turn, the real part of non-frequency pilot sign is carried out square, and to square the result ask average, value after average deducts 1, difference multiply by weights (1-p), the long-pending described adder (510) that is sent to that obtains; Described adder (510) is the result addition of pilot field and non-pilot field, obtain and as described single footpath instantaneous signal power checker (403.11 ..., 403.1N ..., 403.M1 ..., output 403.MN).
3, the sir measurement device of CDMA system uplink according to claim 1 is characterized in that, the relevant device (402.11 of the pilot tone in the every day line in the energy maximum diameter, ..., 402.1N ..., 402.M1, ..., 402.MN) the output pilot signal send into respectively described most powerful path instantaneous noise interferometry device (404.1 ..., 404.M), these frequency pilot signs are sent into described delayer (601) on the one hand, send into described subtracter (602) on the one hand; Described delayer (601) is sent into described subtracter (602) after symbol time of data time-delays; Described subtracter (602) deducts the data of time-delay with the data of not time-delay, the difference that obtains is sent to described plural number and asks die device (603), described plural number is asked the mould value result of die device (603) to be sent to described integral mean device (604) and is averaged, averaged result is as described most powerful path instantaneous noise interferometry device (404.1, ..., described noise average filter (406.1 is sent in output 404.M), ..., 406.M).
4, the sir measurement device of CDMA system uplink according to claim 1 is characterized in that, and described noise average filter (406.1 ..., 406.M) comprise two multipliers (605,608), adder (606) and delayer (607); At first Shu Ru new noise jamming measurement result is sent to described multiplier (605) and coefficient (1-a) and multiplies each other, and multiplies each other with coefficient a at described multiplier (608) through the noise jamming measurement result behind the filter delay; Described adder (606) is the long-pending addition of described two multipliers (605,608), obtain with on the one hand as described noise average filter (406.1, ..., 406.M) output be sent to described SIR combiner (405), be sent to described delayer (607) on the one hand, described delayer (607) multiply by factor alpha, the long-pending described adder (606) that is sent to that obtains sending into described second multiplier (608) after the data time-delay once.
5, the sir measurement device of CDMA system uplink according to claim 1, it is characterized in that, the noise average filter result of the instantaneous signal power results of each all Dan Jing of antenna and each antenna most powerful path imports described SIR combiner (405), described SIR combiner (405) averages the instantaneous signal power results of each all Dan Jing of antenna, the noise average filter result of each antenna most powerful path is averaged, again the former average result divided by latter's average result, promptly obtain sir value output.
6, a kind of application rights requires the sir measurement method of the CDMA system uplink of 1 described measurement mechanism, it is characterized in that, may further comprise the steps:
Suppose that the diversity antenna number is M, every day, line multipath number was N;
Step 1: at the base station receiving terminal, with certain user M strip antenna through search, after the demodulation, export the DPCCH despread signal of N bar Dan Jing respectively, these despread signal are input in the sir measurement module of single footpath, and parallel signal and the interference noise power that carries out M * N bar Dan Jing measured;
Step 2: the instantaneous signal power of K the time slot of the M that is obtained by step 1 * N bar Dan Jing and M most powerful path average noise interference power are input to processing in the SIR combiner (405), the instantaneous signal power of each bar Dan Jing is averaged, M most powerful path average noise interference power averaged, the former averaged result promptly obtains the up sir measurement value SIR (k) of K time slot of this user divided by latter's average result.
7, the sir measurement method of CDMA system uplink according to claim 6 is characterized in that, described step 1 further comprises:
(1) the DPCCH despread signal of the signal power measurement of Dan Jing: Dan Jing is after pilot bits separates, pilot portion is wherein done relevant the processing, and be input to single footpath instantaneous signal power checker (403.11 with the isolated non-pilot bits part of pilot bits, ..., 403.1N ..., 403.M1, ..., 403.MN) in, measure this list footpath K time slot instantaneous signal power
(2) interference noise power of each antenna most powerful path is measured: the isolated whole pilot bits of each antenna most powerful path are sent to lead flat relevant device (402.11, ..., 402.1N ..., 402.M1, ..., 402.MN), be input to most powerful path instantaneous noise interferometry device (404.1 ..., 404.M) in, calculate the instantaneous noise interference power of each antenna most powerful path
(3) the instantaneous noise interference power that (2) are obtained is input to noise average filter (406.1, ..., 406.M) the instantaneous noise interference power that obtains with previous time slot is weighted on average, the weights of current instantaneous interference power are (1-a), the weights of the noise-plus-interference power that previous time slot obtains are a, 0＜a＜1, and both multiply each other with corresponding weights respectively, the long-pending addition again that obtains obtains K time slot most powerful path average noise interference power I
PILOT, M1(k).
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| CN100411318C (en) * | 2005-11-11 | 2008-08-13 | 华为技术有限公司 | Method for carrying out parallel interference compensation based on control channel |
| US7907961B2 (en) * | 2006-06-07 | 2011-03-15 | Broadcom Corporation | Method and apparatus for improving noise power estimate in a WCDMA network |
| WO2008141476A1 (en) * | 2007-05-18 | 2008-11-27 | Zte Corporation | A signal to interference ratio detecting method |
| CN101119131B (en) * | 2007-09-19 | 2010-06-02 | 中兴通讯股份有限公司 | Method for estimating uplink load of user facility |
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