CN1391742A - Relative velocity estimation using TPC-commands - Google Patents

Relative velocity estimation using TPC-commands Download PDF

Info

Publication number
CN1391742A
CN1391742A CN 00816073 CN00816073A CN1391742A CN 1391742 A CN1391742 A CN 1391742A CN 00816073 CN00816073 CN 00816073 CN 00816073 A CN00816073 A CN 00816073A CN 1391742 A CN1391742 A CN 1391742A
Authority
CN
China
Prior art keywords
transmitter
receiver
fading
radio channel
rayleigh
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN 00816073
Other languages
Chinese (zh)
Inventor
R·阿塔里乌斯
J·尼尔松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of CN1391742A publication Critical patent/CN1391742A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the speed of the mobile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Quality & Reliability (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

In a system having a transmitter and a receiver that communicate over a radio channel and in which signal transmission power of the transmitter is adjusted to compensate for fading dips in the channel, the Rayleigh fading rate of the radio channel, and thus the relative velocity between the transmitter and the receiver, are estimated by effectively observing the adjustments or fluctuations in signal transmission power or amplitude of the transmitter. In accordance with an exemplary embodiment of the invention, this is done by observing TPC (Transmission Power Control) commands that cause the transmitter to adjust its signal transmission power to combat Rayleigh fading, i.e., fading dips, in the radio channel. Since the TPC commands cause the transmitter to vary its signal transmission power to compensate for the fading dips, the fading dips and thus the fading rate and the relative velocity between the transmitter and the receiver can be determined by observing the signal transmission power fluctuations represented by the TPC commands.

Description

Use the relative velocity of TPC order to estimate
Background of invention
Invention field
The present invention relates to aerogram, and relate to particularly and estimate that travelling carriage is with respect to the speed of transmitter in the mobile communication system.
Technical background
In mobile communication system, usually need accurately to estimate radio channel or be the radio channel modeling, so that strengthen performance by the receiver of aerogram channel receiving signal.
Fig. 1 illustrates example wireless radio channel known in the art.Particularly, transmitter 102 sends signal by radio channel 104, and this radio channel is subjected to AWGN (additive white Gaussian noise) influence, and AWGN represents with unit 106.Then, this signal is received at receiver 108 places.
Radio channel often is subjected to the influence of multipath transmisstion, this is that path between transmitter and receiver causes when including arrogant reflected by objects, makes to advance along the different path with different length before the receiver place meets from the ray of the transmission signals of transmitter.Therefore, when the ray of signal meets, because different paths has phase difference between these rays.This can cause Rayleigh (Rayleigh) decline, and wherein the ray of transmission signals or echo are grown or combination mutually mutually according to their phase place with disappearing.Therefore, because the signal of the combination that receives at the receiver place is made up of many less ray or echo at the transmission signals of advancing along different paths on the distance of receiver, the signal of this combination presents randomly changing on amplitude and phase place.Therefore, though transmitter with constant power or amplitude output transmission signals, also can be at the amplitude or the power of the transmission signals at receiver place owing to the Rayleigh decline change.
The composite signal that is received by receiver is modeled usually or is represented as has the Rayleigh probability distribution, and it is defined as: P ( r ) = re - r 2 / 2 s 2 S 2
In other words, the Rayleigh distribution is described in the distribution about signal component the Rayleigh fading channel in the envelope of the RMS value of the signal that sends to receiver from transmitter, sight line path between receiver and transmitter is blocked, so that the signal that is sent by transmitter is in the multipath mode, different ray or the components of signal with along the different paths reflection that arrives receiver arrives under the situation of receiver.Because because the multipath component of a plurality of outs of phase or the arrival of ray, the homophase of signal and quadrature component come down to Gaussian, describe envelope so Rayleigh distributes.So, follow Rayleigh as the subduplicate signal envelope of the quadratic sum of homophase and quadrature component and distribute.
Ray from the transmission signals of transmitter is long mutually at the receiver place or is combined with disappearing mutually, depends on Receiver And Transmitter and the certain location of blocking type/reflective object in their environment.Therefore, if receiver changes the position with respect to transmitter and environment, then it can move through wherein differently combined location of ray.In other words, when receiver moved, it is long mutually that ray is sentenced mode alternately at receiver, combination mutually then with disappearing, make receiver experience a series of " fading dip (fading dip) ", wherein the amplitude of the signal of Jie Shouing is sunk periodically, turns back to its previous level then.The frequency of these fading dips, or the number of times of the fading dip of time per unit in other words are commonly called " rate of fading " of radio channel.
Rate of fading is corresponding to the speed of receiver with respect to transmitter, and like this, when the speed of receiver increased, rate of fading also increased.The result is, rate of fading is equivalent to " Doppler's expansion " of Rayleigh decline radio channel, and it is defined as: F d = 2 · V · F c c
F in the formula d=Doppler expansion,
The V=receiver is with respect to the speed of transmitter,
F c=from the frequency of the transmission signals of transmitter, and
The c=light velocity (3 * 10 8Meter per second).
For example, if the speed of receiver be 50 kms/hour, and frequency transmission signal is 2GHz, then Doppler's expansion will be about 185Hz.Therefore, rate of fading will be 185Hz, this means, with downward-sloping, or recover per second 185 times then in the decline of amplitude cocycle ground in the amplitude of receiver place transmission signals.On the contrary, if known transmission signal frequency and rate of fading, then this equation can be used for determining the relative velocity of receiver.
Relative velocity between receiver and transmitter is proportional to the bandwidth that Rayleigh distributes, and it relates to the character of radio channel again, such as the second moment statistical property of radio channel.If the character of known radio channel, the then exchange between transmitter and receiver or communicate by letter and to improve widely.In other words, the relative velocity between receiver and the transmitter determines or the character of reflection radio channel, and they are useful for strengthening communicating by letter between transmitter and the receiver.Therefore, importantly accurately determine the relative velocity between receiver and the transmitter, for example the relative velocity between the travelling carriage in mobile radio communication (MS) and base station (BS).Relative velocity between receiver and transmitter is normally for example estimative by the decline character of expanding the radio channel that equation research seen by receiver according to above-mentioned Doppler.
Because the high spreading rate (chiprate) in the mobile communication system of using CDMA (code division multiple access), the receiver in such system is equipped with power controller usually, reduces or overcome the influence of fading dip in the radio channel.By the power control of the signal of transmitter broadcasts normally according to the estimation of the SIR (signal-to-jamming ratio) of receiver.SIR passes through to use the pilot technique such as pilot signal or channel usually, data, or the combination of pilot technique and data, and estimated.Receiver uses the estimation notice of SIR or indication transmitter to reduce or increase it to be used for the power of signal broadcasting to receiver.In fact, transmitter change signal broadcasting power compensates the Rayleigh decline.Therefore, be changed, make that power or the amplitude from the broadcast singal of transmitter will be effectively constant at the receiver place, remain on the constant SIR in receiver place thus in the power or the amplitude of transmitter place broadcast singal.
Fig. 2 shows exemplary process process known in the art, and wherein as shown in step 202, SIR is to use data and/or pilot technique estimative.Control enters step 204 from step 202, compares at this SIR and reference value.Control enters step 206 from step 204, according to the comparison in step 204, forms the TPC order at this, then it is sent to transmitter, and the notice transmitter: how it should change power or the amplitude that it is sending to the signal of receiver.
The communicating by letter of (for example, travelling carriage and base station) between receiver and transmitter of the signal power that relevant controlling sends from transmitter used TPC to order usually and finished.
The exemplary configurations of the data that Fig. 3 explanation sends in the down link from the network to the travelling carriage in W-CDMA (broadband one code division multiple access) system.Particularly, superframe 302 comprises 72 frames such as frame 304.Each frame comprises 15 time slots such as time slot 306.Each time slot comprises symbol, comprises frequency pilot sign and TPC symbol.The sum of the number of every kind of symbol and all symbols in time slot depends on the spreading factor that is used to the CDMA expansion.For example, as shown in the time slot 306, each time slot can comprise 20 symbols altogether that comprise 4 frequency pilot signs 308 and single TPC symbol 310.
The transmitting power that is added to transmitter is controlled the maximum rate of fading that the rate limit transmitter can compensate effectively.For example, in W-CDMA (broadband-code division multiple access), wherein power control speed is 1500Hz, when travelling carriage with when per hour 30 km speed move, fading dip can be overcome effectively by using the TPC order.When relative velocity was low with respect to power control speed, power control can move most effectively usually and overcome decline.This is to export the fading dip that overcomes the receiver place because power control speed is determined the broadcasting power how soon transmitter can react and change it, and the relative velocity between receiver and the transmitter is determined can how soon to occur at receiver place fading dip., relative velocity increases when thereby increasing rate of fading, also must increase for overcoming the necessary power control of decline speed effectively, in other words, if power control speed suitably improves, because the higher rate of fading that the bigger relative velocity of receiver causes can be overcome effectively by using the TPC order in theory.
Yet the relative velocity between receiver and the transmitter is normally estimative by the decline character of studying the radio channel of being seen by receiver.Therefore, when the TPC order is used for overcoming the Rayleigh decline of being seen by receiver effectively, be used to estimate that this technology of relative velocity is coarse, because the decline of being seen by receiver has been removed in compensation.In other words, the inaccuracy of velocity estimation increases with the validity of power control.When speed is low with respect to power control speed, make that velocity estimation will be coarse when power control overcomes decline effectively.
Therefore, exist in and reduce or eliminate decline and the time accurately estimate relative velocity between receiver and the transmitter, such as the needs of the relative velocity between travelling carriage and the base station.
Brief summary of the invention
According to exemplary embodiment of the present invention, in system with decline transmitter and receiver and the compensated receiver place of communicating by letter by radio channel, by observing effectively in the signal power of transmitter place appearance or the fluctuating of amplitude, rather than the power or the quality of observing the signal that receives at the receiver place rise and fall, estimate Rayleigh rate of fading or Doppler's expansion of radio channel, thereby estimate the relative velocity between receiver and transmitter.This is by observing the TPC order or being finished by the signal broadcasting power change of TPC order expression, the TPC order is to send to transmitter by receiver, make its signal transmission power of transmitter adjustments, so that when this signal is received the machine reception, it will have effectively constant power level or signal quality.
Because the figure of TPC order (or the power of their expressions changes) can be observed the TPC order, to determine what fading dips occurring at this time durations in this channel corresponding to the fading dip in the channel in a period of time.Therefore, the TPC order, or by the signal broadcasting power change that TPC orders expression, can be used for accurately estimating rate of fading, and pass through to use above-mentioned about Doppler's expansion technique estimation receiver of rate of fading and the relative velocity between the transmitter.When fading dip can be overcome by use TPC order, such estimation was fit to.
The accompanying drawing summary
During DETAILED DESCRIPTION OF THE PREFERRED below reading in conjunction with the accompanying drawings, those skilled in the art will be appreciated that other purpose of the present invention and advantage.Unit identical on the accompanying drawing is represented with identical reference number.
Fig. 1 shows the radio communication according to prior art.
Fig. 2 shows the exemplary transmitting power control procedure according to prior art.
Fig. 3 is presented at the exemplary configurations of the data that send in the down link from the network to the travelling carriage in W-CDMA (wireless-code division multiple access) system.
Fig. 4 shows the example corresponding to a series of TCP orders of fading dip.
Fig. 5 shows the processing procedure according to exemplary embodiment of the present invention.
Preferred embodiment is described
According to exemplary embodiment of the present invention, has the transmitter and receiver that communicates by radio channel, and wherein from the signal transmission power of transmitter emission or amplitude are conditioned system with the fading dip the compensate for channel, the signal transmission power by observing transmitter effectively or the adjusting or the fluctuating of amplitude, estimate the Rayleigh rate of fading of radio channel, thereby estimate the relative velocity between receiver and transmitter.
Receiver control and the transmitting power of regulating transmitter compensate the Rayleigh decline, i.e. fading dip in the radio channel, and making provides constant signal power or quality at the receiver place.For example, receiver can send TPC (transmitting power control) and order transmitter, makes its signal transmission power of transmitter adjustments overcome fading dip.Since transmitting power rise and fall corresponding to and represent fading dip in the channel, rate of fading (fading dip of time per unit) or Doppler's expansion can be determined by observing the TPC order.Then, rate of fading or Doppler expansion can be used for by use above-mentioned about rate of fading Doppler's expansion technique and accurately estimate relative velocity between receiver and the transmitter.
Fig. 4 shows the example of a series of TPC orders and corresponding signal transmission power (expression fading dip).X-axis is the timeline with binary system TPC order (" u "=upwards, " d "=downwards), and it makes transmitter increase or reduce its signal transmission power.This signal transmission power is indicated on the Y-axis.In this example, use all structure of time slot as shown in Figure 3, wherein receiver each time slot of sending to transmitter comprises the TPC order.The frequency of TPC order can be the 1500Hz in the WCDMA system for example.The signal transmission power increment of example and the TPC of other example order frequency are known in this area, so be not described in detail here.
As what see in time period A, TPC command instruction transmitter keeps the steady-state signal transmitting power effectively.At time period B, total effect is the increase of signal transmission power, and then at time period C, the TPC order that is dealt into transmitter by receiver makes transmitter reduce signal transmission power to steady state level.At time period D, TPC command instruction transmitter keeps the steady-state signal transmitting power effectively.Therefore, Fig. 4 is presented at the single fading dip that appears at during the time period that crosses over time period B and C in the channel.
Signal power changes the variation in the speed during the middle part of time period B also can be seen the noise of a bit or cave in, and wherein one of TPC order makes signal transmission power instantaneous reducing before the next one makes the TPC order that signal transmission power continues to increase.In addition, must represent the different change speed of signal power by using " making progress " and the mixing of " downwards " binary system TPC order.For example, the TPC sequence upwards-upwards-upwards-downwards-upwards-upwards-upwards-downwards expression compared with TPC sequence higher change speed upwards-upwards-downwards-upwards-upwards-downwards.Those skilled in the art it will be appreciated that, the signal processing technology of knowing can easily be used for accurately differentiating the fading dip that changes in time corresponding to signal transmission power, and no matter by noise or be different from the fluctuating of the signal transmission power that other source of fading dip causes.
Fig. 5 explanation uses TPC to order the method for estimating the relative velocity between receiver and the transmitter according to exemplary embodiment of the present invention.In in step 502, represent, at first observe the TPC order.Control enters step 504 from step 502, these a plurality of signal transmission power level fluctuations corresponding to the fading dip in the radio channel between receiver and the transmitter be according to the observation to TPC order be identified.The time frame that the fluctuating that is identified wherein occurs also is identified, and is used for determining the speed or the frequency of the fluctuating that is identified.This speed is rate of fading or the Doppler's expansion of estimating.
Control enters step 506 from step 504, expands according to the rate of fading of estimating or Doppler at this and estimates the speed of receiver with respect to transmitter.Particularly, the known carrier frequency by the signal that sends the rate of fading of estimating with by transmitter is updated to above-mentioned Doppler and expands in the equation, can estimate this speed.
Control enters step 508 from step 506, is used for estimating or characterizing the character of radio channel with respect to the speed of the estimation of transmitter at this receiver.Control enters step 510 from step 508, is used for keeping or strengthens in the quality of communicating by letter by radio channel between transmitter and the receiver in the character of this radio channel.Control enters step 502 from step 510, repeats this circulation at this.
According to exemplary embodiment of the present invention, observe and analyze TPC and order to determine in travelling carriage, to carry out relative velocity between rate of fading and travelling carriage and the base station.According to another exemplary embodiment of the present invention, observe and analyze TPC and order to determine in receiver, to carry out relative velocity between rate of fading and receiver and the transmitter.In other words, this analysis and determine can be in communication system, or be connected to communication system, carry out any suitable position.
It will be recognized by those skilled in the art that travelling carriage both can also can be used as receiver as transmitter, and the base station equally both can be used as transmitter and also can be used as receiver, because communicating by letter between travelling carriage and base station is normally two-way.Therefore, principle described herein can be differently with reciprocity be applied to travelling carriage and base station and other transceiver.
Those skilled in the art will recognize that also the present invention can be applied to have in the system different or available widely TPC command group, and this TPC command group for example comprises the have various available power increment amplitudes TPC order of (comprising zero).
Other mechanism that the signal transmission power corresponding to fading dip at expression transmitter place rises and falls also can be used or is observed, is used for determining fading dip or rate of fading in the radio channel, and the relative velocity between receiver and the transmitter.
Those skilled in the art will appreciate that also under the situation that does not deviate from spirit of the present invention or intrinsic propesties, the present invention can embody with other specific forms, and the present invention is not limited to specific exemplary embodiment described herein.Therefore current disclosed exemplary embodiment all is looked at as illustrative, rather than restrictive in all respects.Scope of the present invention represented by claims, rather than represented by above-mentioned explanation, belong to meaning of the present invention and scope with and equivalent in all changes be intended to be included in the present invention.

Claims (10)

1. one kind is used for estimating may further comprise the steps in the receiver of Rayleigh decline radio channel and the method for the relative velocity between the transmitter:
Observe command transmitter and change its signal transmission power to overcome TPC (transmitting power control) order of the Rayleigh decline in the radio channel;
According to observed TPC order, estimate the Rayleigh rate of fading of radio channel; And
According to the rate of fading of estimating, estimate the speed of receiver with respect to transmitter.
2. the process of claim 1 wherein and in a period of time, observe the TPC order, and estimate that the step of Rayleigh rate of fading may further comprise the steps:
Identification is corresponding to the TCP command sequence of the fading dip in the channel; And
According to a plurality of fading dips of representing by the TCP command sequence of the identification that during this time period, occurs, estimate the Rayleigh rate of fading.
3. the process of claim 1 wherein that this transmitter is the travelling carriage in the mobile radio communication.
4. the process of claim 1 wherein that this transmitter is the base station in the mobile radio communication.
5. the process of claim 1 wherein that this receiver is the travelling carriage in the mobile radio communication.
6. the process of claim 1 wherein that this receiver is the base station in the mobile radio communication.
7. the method for claim 1, further comprising the steps of:
Characterize the character of radio channel according to estimated relative velocity; And
According to the character of the radio channel that is characterized, strengthen the quality of the radio communication between transmitter and receiver.
8. the process of claim 1 wherein that each step is by this receiver execution.
9. method that is used for estimating the relative velocity between Rayleigh decline radio channel receiver and transmitter may further comprise the steps:
Observation is by the fluctuating in the signal transmission power of this transmitter emission;
Determine which rises and falls corresponding to the fading dip in the radio channel;
According to determined fading dip, estimate the Rayleigh rate of fading of radio channel; And
According to the Rayleigh rate of fading of estimating, estimate the speed of receiver with respect to transmitter.
10. the process of claim 1 wherein that this fluctuating is to change TPC (transmitting power control) order of its signal transmission power by the observation command transmitter, and observe indirectly.
CN 00816073 1999-11-22 2000-11-13 Relative velocity estimation using TPC-commands Pending CN1391742A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44735499A 1999-11-22 1999-11-22
US09/447,354 1999-11-22

Publications (1)

Publication Number Publication Date
CN1391742A true CN1391742A (en) 2003-01-15

Family

ID=23776041

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 00816073 Pending CN1391742A (en) 1999-11-22 2000-11-13 Relative velocity estimation using TPC-commands

Country Status (5)

Country Link
EP (1) EP1232589A1 (en)
JP (1) JP2003516091A (en)
CN (1) CN1391742A (en)
AU (1) AU1279501A (en)
WO (1) WO2001041335A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4138668B2 (en) 2002-03-08 2008-08-27 テレフオンアクチーボラゲット エル エム エリクソン（パブル） System and method for performing speed information through transmission power control command

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE517660C2 (en) * 1997-06-23 2002-07-02 Telia Ab Improvements to, or with regard to, mobile radio telephony
WO1999012275A1 (en) * 1997-09-02 1999-03-11 Motorola Inc. Adaptive power control of a pilot sub-channel
JP3393365B2 (en) * 1997-10-08 2003-04-07 沖電気工業株式会社 Transmission power control method
JP3913879B2 (en) * 1998-02-03 2007-05-09 富士通株式会社 Communication control apparatus and method based on moving speed

Also Published As

Publication number Publication date
WO2001041335A1 (en) 2001-06-07
EP1232589A1 (en) 2002-08-21
AU1279501A (en) 2001-06-12
JP2003516091A (en) 2003-05-07

Similar Documents

Publication Publication Date Title
CN1157863C (en) Method and apparatus for controlling transmission energy in communication system employing orthogonal transmit diversity
US6804311B1 (en) Diversity detection for WCDMA
CN101814931B (en) Doppler frequency shift estimation and compensation method in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
CN1181657C (en) Method and device for estimating frequency offset by combining pilot symbols and data symbols
CN1256816A (en) Power control in mobile communications system
CN1372744A (en) Synchronization and detection of modulation type
CN1483254A (en) Interference power estimation for adaptive antenna system
CN100342668C (en) Radio transceiver with velocity dependent signal quality estimation
EP0894366B1 (en) Adaptive compensation of doppler shift in a mobile communication system
CN101778465B (en) Error estimation based proportion power control method in CDMA (Code Division Multiple Access) cellular system
CN1183695C (en) Closed loop power control in radio communication system
CN1338835A (en) Method and device for measuring S/N ratio
Park et al. Optimal pilot and data power allocation for joint communication-radar air-to-ground networks
EP1166464B1 (en) A communication system transmit power control method
WO2004034614A1 (en) A method and device for estimating a signal to interference ratio (sir) in wcdma systems
CN1391742A (en) Relative velocity estimation using TPC-commands
US20040015308A1 (en) Method of estimating doppler frequency shift and method of transmitting data using the same
CN1378731A (en) Method and apparatus for channel estimation with transmit diversity
EP1056237A2 (en) Diversity detection for WCDMA
CN1976249B (en) Method for determining whether or not regulating to multipath search window
CN112533271B (en) Adaptive control method and device for transmitting power of satellite communication module
CN1149865C (en) Non-uniformly code rate matching method of wireless mobile communication system
CN1215512A (en) Adaptive compensation of doppler shift in a mobile communication system
CN1148905C (en) Anti-deep attenuation semi-blind channel evaluation method in wide band code division multiple access
US6907061B1 (en) Method for controlling the emission power of a transceiver in communication with another transceiver

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication