CN103023619B - Wireless communication system link self-adaption transmission method - Google Patents
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Abstract
The invention discloses a wireless communication system link self-adaption transmission method. The wireless communication system link self-adaption transmission method includes two parts, namely, a physical-layer transmission technology configuration method of link self-adaption modulation and coding and the like on the basis of average signal to noise ratio and signal to noise ratio difference factor, and an emission format configuration method applicable to multi-antenna system such as MIMO (multiple input multiple output) communication system on the basis of average signal to noise ratio and average multi-diameter relative energy factor. The wireless communication system link self-adaption transmission method can be used for places where quick link self-adaption technology is inapplicable, not only can be used for a single-antenna system but multi-antenna system and is lower in feed frequency as compared with that of the quick link self-adaption transmission method, load of the system can be reduced and meanwhile, performance of the self-adaption communication system can be effectively improved.
Description
Technical field
The present invention relates to communication system, especially relate to a kind of mobile radio system link self-adaption transmission method.
Background technology
Wireless communication system link adaptive technique improves the data rate of wireless system by self-adaptative adjustment emission parameter (as modulation and coding etc.).Be applied to the link adaptation techniques of a single aerial system through years of researches and practice, achieve a lot of achievements, but for emerging multiaerial system, refer generally to multiple-input, multiple-output (MIMO) system, link adaptation techniques needs to introduce new self adaptation dimension and spatial selectivity, and existing link adaptation techniques is faced the challenge.In typical wireless communication system, multiple the copying that the signal of receiver end is produced by the same different paths transmitted in communication environments is formed, these addition of waveforms strengthen or the fluctuation of attenuated signal intensity on time dimension together, are referred to as time selectivity.In wideband transmit, in the possibility is-greater-than symbol cycle in relative time delay of different propagation path, cause the channel fluctuations of frequency domain, this fading effect is called frequency selectivity.When transmitter or receiver configure multiple antenna, the signal that different array element receives can experience and independently decline, and can delineate the channel of this type with spatial selectivity.Spatial selectivity depends on physical features (spatial distribution as waveform) and the array characteristics (as antenna distance, cross polarization and antenna pattern) of channel simultaneously, the spatial distribution of multipath determines the power angular spectrum of channel, and the variance of usual angular spectrum or angle spread describe.In reality system, improve link performance by developing time of mimo channel, frequency and spatial selectivity.Wireless system such as the standards such as IEEE 802.11n, IEEE 802.16e, 3GPP Long Term Evolution of current employing MIMO technology both define different modulation and code set.In addition, people are also studying the Space Time Coding mechanism of mimo system under different modulating and coding, but these methods are not all suitable for link circuit self-adapting, especially difficult on assessment link performance.
Link adaptation techniques can be divided into rapid link self adaptation and slow speed link self adaptation two kinds, and a very long time before this, link adaptation techniques refers to rapid link self adaptation always.Rapid link adaptive technique follows the tracks of the instant channel change that multipath fading causes, instant signal to noise ratio (signal-to-noise estimated by receiver, SNR) and to the optimum constellation signaling of receiver feedback, pass through self adaptation, system can improve transmitting throughput under good channel condition, simultaneously can guaranteed performance under bad channel condition.But because rapid link adaptive technique is the self adaptation to instant channel change, so there is higher feedback velocity, particularly when channel is very unstable, receiver may be frequently to the feedback of transmitter, brings larger burden to system.Existing slow speed link adaptive technique follows the tracks of the average of multipath fading, thus there is lower feedback velocity, but for growing MIMO communication system, at present also not and spatial selectivity well combine, general mobile radio system can not be applicable to.
Summary of the invention
In view of this, the present invention is for solving the problems of the technologies described above, average signal-to-noise ratio is comprised by definition, signal to noise ratio deviation factors, the channel quality parameter such as the average multipath relative energy factor, propose a kind of wireless communication system link adaptive transmission method based on channel quality parameter, the inapplicable occasion of rapid link adaptive technique can be used for, a single aerial system can be applied to, also can be applicable to multiaerial system, compare with rapid link adaptive transmission method and there is lower feedback frequency, system burden can be reduced, effectively can improve the performance of adaptive communication system simultaneously.
For achieving the above object, the invention provides a kind of mobile radio system link self-adaption transmission method, comprise the following steps:
(1) obtain channel quality parameter, described channel quality parameter comprises one or more in average signal-to-noise ratio, signal to noise ratio deviation factors, the average multipath relative energy factor;
Described average signal-to-noise ratio is the arithmetic mean of repetitive measurement gained signal to noise ratio in section preset time; Described signal to noise ratio deviation factors is
, wherein M is the measurement total degree in section preset time,
be the signal to noise ratio of the gained that i-th time is measured, ASNR is average signal-to-noise ratio;
The described average multipath relative energy factor is the arithmetic mean of the multipath relative energy factor in section preset time, and the described multipath relative energy factor is one of following numerical value:
The ratio of the power in a the strongest path of signal that () receives and the gross power in all the other each paths or all paths, or the ratio of the significant level absolute value in the strongest path of signal received and the significant level absolute value sum in all the other each paths or all paths;
Power and time ratio of the power in strong path in the b the strongest path of signal that () receives, or the ratio of the significant level absolute value in the significant level absolute value in the strongest path of signal received and time strong path;
(2) according to channel quality parameter, carry out the configuration of physical layer transmission technology, described physical layer transmission technology comprises one or more set of the communication transmission technology such as modulation system, coded system;
Also can comprise the step of configuration of carrying out launching form according to channel quality parameter further, described transmitting form comprises one or more combination of diversity, the communication transmission technology such as multiplexing.
The configuration of described physical layer transmission technology comprises the following steps: to set one or more average signal-to-noise ratio thresholding, and the channel of wireless communication system is divided into two or more channel statuss by the size of average signal-to-noise ratio, respectively the set of configures physical layer transmission technology.
The set of the described layer of configures physical respectively transmission technology also comprises: set a signal to noise ratio deviation threshold, for often kind of channel status, when signal to noise ratio deviation factors is greater than signal to noise ratio deviation threshold, in described physical layer transmission technology set, adopt the modulation system of lower-order number and (or) more inefficient coded system.
Describedly carry out launching the configuration of form according to channel quality parameter and comprise the following steps:
(1) one or more average multipath relative energy factor thresholding is set, and one or more antenna amount thresholding, according to the population size of the antenna of the average multipath relative energy factor in some threshold ranges of the signal received, carry out channel status division.
(2) set one or more average signal-to-noise ratio thresholding, set multiple transmitting form, transmitting form is set according to the size of average signal-to-noise ratio and residing channel status.
Preferably, described mode of carrying out channel status division is: set the average multipath multipath energy factor first thresholding and the second thresholding, set the first antenna amount thresholding, the second antenna amount thresholding, third antenna quantity thresholding, according to the combined situation of the average multipath relative energy factor of all reception antennas, channel status is divided into one of following kind:
A (), when the number receiving the average multipath relative energy factor and be more than or equal to the antenna of the signal of the average multipath relative energy factor first thresholding is more than or equal to the first antenna amount thresholding, is the first channel status;
B () is when the number receiving the average multipath relative energy factor and be more than or equal to the antenna of the signal of the average multipath relative energy factor first thresholding is less than the first antenna amount thresholding and is more than or equal to the second antenna amount thresholding, or when receiving the average multipath relative energy factor and be less than the average multipath relative energy factor first thresholding and the number being more than or equal to the antenna of the signal of the average multipath relative energy factor second thresholding being more than or equal to third antenna quantity thresholding, be second channel state;
C (), when the number receiving the average multipath relative energy factor and be more than or equal to the antenna of the signal of the average multipath relative energy factor first thresholding is less than the second antenna amount thresholding, is the 3rd channel status;
Preferably, the described size according to average signal-to-noise ratio and residing channel status are arranged to be launched the mode of form and is: setting average signal-to-noise ratio first thresholding and the second thresholding, is one of following manner according to the size of average signal-to-noise ratio and residing channel status by transmitting format configuration:
A (), for the first channel status, when average signal-to-noise ratio is less than average signal-to-noise ratio the first thresholding, is transmitting form A; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio first thresholding and is less than average signal-to-noise ratio the second thresholding, for launching form A or launching form B; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio the second thresholding, for launching form B;
B (), for second channel state, when average signal-to-noise ratio is less than average signal-to-noise ratio the first thresholding, is transmitting form A; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio first thresholding and is less than average signal-to-noise ratio the second thresholding, for launching form B or launching form C; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio the second thresholding, for launching form B or launching form C;
C (), for the 3rd channel status, when average signal-to-noise ratio is less than average signal-to-noise ratio the first thresholding, is transmitting form A; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio first thresholding and is less than average signal-to-noise ratio the second thresholding, for launching form B or launching form C; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio the second thresholding, for launching form C;
Described transmitting form A mainly provides diversity, and described transmitting form C mainly provides multiplexing, and described transmitting form B provides diversity and multiplexing simultaneously.
Preferably, described multiple average signal-to-noise ratio thresholding is 15dB and 25dB two, described physical layer transmission technology set comprises { 4-QAM, CTC-1/2}, { 16-QAM, CTC-2/3}, { 64-QAM, CTC-3/4}, described signal to noise ratio deviation threshold is 2dB, and physical layer transmission technology set is configured to:
(1) when average signal-to-noise ratio is less than 15dB, { 4-QAM, CTC-1/2} transmission technology set is adopted;
(2) when average signal-to-noise ratio is more than or equal to 15dB and be less than 25dB, if signal to noise ratio deviation factors is less than or equal to 2dB, then adopt { 16-QAM, the set of CTC-2/3} transmission technology, if signal to noise ratio deviation factors is greater than 2dB, then adopt { 4-QAM, CTC-1/2} transmission technology set;
(3) when average signal-to-noise ratio is more than or equal to 25dB, if signal to noise ratio deviation factors is less than or equal to 2dB, then { 64-QAM is adopted, the set of CTC-3/4} transmission technology, if signal to noise ratio deviation factors is greater than 2dB, then adopt { 16-QAM, CTC-2/3} transmission technology set.
Preferably, described average signal-to-noise ratio first thresholding is 15dB, and described average signal-to-noise ratio second thresholding is 25dB.
Beneficial effect of the present invention:
(1) the present invention proposes a single aerial system slow speed link adaptive technique of a kind of average signal-to-noise ratio and the combination of signal to noise ratio deviation factors, relative rapid link adaptive technique has lower feedback velocity, the burden of system can be reduced, the technology of the present invention introduces the judgement that signal to noise ratio deviation factors carrys out auxiliary controls transfer technology, and relatively existing slow speed link adaptive technique is more accurate, reasonable;
(2) the present invention utilizes average multipath relative energy Summing Factor average signal-to-noise ratio to combine to determine the transmitting form of communication system, propose the slow speed link adaptive technique being applicable to multiaerial system, be applicable to general mobile radio system.
Method proposed by the invention can be used as one independent partly integrated enter in mobile communication system, improve the performance of mobile communication system.
Accompanying drawing explanation
Fig. 1, the flow chart of the wireless communication system link adaptive transmission method that the present invention proposes;
Fig. 2, based on the communication system link adaptive technique schematic diagram of channel quality parameter;
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 2, a kind of wireless communication system link adaptive transmission method provided by the invention, be made up of two parts, namely based on the physical layer transmission technology adaptive configuring method such as modulation, coding of average signal-to-noise ratio ASNR and signal to noise ratio deviation factors Bias_SNR, and based on the transmitting format collocation method of average signal-to-noise ratio ASNR and average multipath relative energy factors A MRE.The former is for determining the technology such as the modulation that communication system uses and coding, and the latter chooses suitable transmitting form (also can be described as emission matrix) mainly for the spatial selectivity of communication system.
As shown in Figure 1, a kind of wireless communication system link adaptive transmission method provided by the invention, comprises the following steps:
(1) obtain channel quality parameter, channel quality parameter comprises average signal-to-noise ratio ASNR, signal to noise ratio deviation factors Bias_SNR, average multipath relative energy factors A MRE.
Average signal-to-noise ratio is the arithmetic mean of repetitive measurement gained signal to noise ratio in section preset time, supposes to have carried out M survey calculation within this time period, and the snr value that each survey calculation obtains is
, then average signal-to-noise ratio is
Signal to noise ratio deviation factors is defined as:
The average multipath relative energy factor is the arithmetic mean of the multipath relative energy factor in section preset time, for describing the mean value of multipath relative energy factor M RE on multipath fading, is specially one of following numerical value:
The ratio of the power in a the strongest path of signal that () receives and the gross power in all the other each paths or all paths, or the ratio of the significant level absolute value in the strongest path of signal received and the significant level absolute value sum in all the other each paths or all paths.
Power and time ratio of the power in strong path in the b the strongest path of signal that () receives, or the ratio of the significant level absolute value in the significant level absolute value in the strongest path of signal received and time strong path.
(2) according to channel quality parameter, carry out the configuration of physical layer transmission technology, physical layer transmission technology comprises the set of the communication transmission technology such as modulation system, coded system, and the configuration mode of physical layer transmission technology is specially:
The variations situation of signals transmission is described with average signal-to-noise ratio ASNR, the average signal-to-noise ratio ASNR being in varying level represents several different channel status, and often kind of channel status uses the physical layer transmission technology such as different modulation and coding to process rear transmission to signal.Definition
(
) be average signal-to-noise ratio thresholding, definition
(
) be i-th kind of channel status, definition
(
) be the i-th class transmission technology set, each class transmission technology set contains the concrete physical layer transmission technology of system use as modulation, coding etc.When average signal-to-noise ratio ASNR value lower than
, we think that channel is in the 1st kind of channel status C
1, when average signal-to-noise ratio ASNR is in
with
(
) between time, we think that present channel is in (i+1) and plants channel status, when average signal-to-noise ratio ASNR value higher than
, channel is then in (L+1) and plants channel status; Each channel status corresponding
, we think that system should adopt the technology specified in the i-th class physical layer transmission technology set, it is noted herein that average signal-to-noise ratio ASNR is not only depended in choosing of transmission technology set, also need to consider signal to noise ratio deviation factors Bias_SNR simultaneously.When signal to noise ratio deviation factors Bias_SNR is greater than a certain signal to noise ratio deviation threshold
time, we consider to adopt comparatively conservative transmission technology, namely adopt the modulation of lower-order number and/or more inefficient coding.Such as, we define
,
be two average signal-to-noise ratio thresholdings,
,
,
be three kinds of channel statuss,
,
,
be three class physical layer transmission technology sets, wherein
,
,
,
so:
(1) when average signal-to-noise ratio ASNR is less than 15dB, judge that channel status is
, adopt
transmission technology set;
(2) when average signal-to-noise ratio ASNR is more than or equal to 15dB and is less than 25dB, judge that channel status is
if signal to noise ratio deviation factors Bias_SNR is less than or equal to signal to noise ratio deviation threshold
time, adopt
transmission technology set, if signal to noise ratio deviation factors Bias_SNR is greater than signal to noise ratio deviation threshold
time, adopt
transmission technology set.
(3) when average signal-to-noise ratio ASNR is more than or equal to 25dB, judge that channel status is
if signal to noise ratio deviation factors Bias_SNR is less than or equal to signal to noise ratio deviation threshold
, adopt
transmission technology set, if signal to noise ratio deviation factors Bias_SNR is greater than signal to noise ratio deviation threshold
time, adopt
transmission technology set.
(3) according to channel quality parameter, carry out launching the configuration of form, launch the combination that form comprises diversity, the communication transmission technology such as multiplexing.
The present embodiment considers one
mIMO(multiple-input, multiple-output) wireless communication system,
with
be respectively number of transmit antennas and reception antenna number, use three kinds to launch form and comprise transmitting form A, launch form B and launch form C.Launch form A and provide diversity, launching form C provides multiplexing, launches form B and takes into account diversity and multiplexing.Because each root reception antenna all can receive multipath signal independently, therefore, can the average multipath relative energy factor of multipath signal that receives of measurements and calculations every root antenna
, set average multipath relative energy factor thresholding
,
, transmitting format configuration is as follows:
(1) channel status division is carried out.
(a) when
in root reception antenna, receive the average multipath relative energy factor
be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be more than or equal to setting antenna amount thresholding
time, channel status is CS1;
(b) when
in root reception antenna, receive the average multipath relative energy factor
be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be less than setting antenna amount thresholding
and be more than or equal to setting antenna amount thresholding
time, or when receiving the average multipath relative energy factor
be less than average multipath relative energy factor thresholding
and be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be more than or equal to setting antenna amount thresholding
time, channel status is CS2;
(c) when
in root reception antenna, receive the average multipath relative energy factor
be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be less than setting antenna amount thresholding
time, channel status is CS3.
(2) set average signal-to-noise ratio thresholding Th1, Th2, determine the transmitting format configuration under different average signal-to-noise ratio and different channels state according to following table.
Mimo wireless communication system under table 1. different channels state launches format configuration table
| Channel status | ASNR is less than thresholding Th1 | ASNR is more than or equal to thresholding Th1 and is less than thresholding Th2 | ASNR is more than or equal to thresholding Th2 |
| CS1 | Launch form A | Launch form A or B | Launch form B |
| CS2 | Launch form A | Launch form B or C | Launch form B or C |
| CS3 | Launch form A | Launch form B or C | Launch form C |
In Table 1, when the selection that appearance two kinds is possible, we can from the angle paying the utmost attention to link throughput or transmission reliability, such as, when channel status is CS2, if when average signal-to-noise ratio ASNR is more than or equal to average signal-to-noise ratio thresholding Th1 and is less than average signal-to-noise ratio thresholding Th2, launch form can choose transmitting form B or launch form C, now, further, if when paying the utmost attention to link throughput, select and launch form C, if when paying the utmost attention to transmission reliability, select and launch form B.
The present embodiment further considers one
mIMO (multiple-input, multiple-output) mobile radio system, is described in detail, and launches form and uses matrix notation, wherein the line display antenna serial number of matrix
, matrix column represents transmitting symbol time
, matrix entries represents at symbol time
internal antenna
the signal code of upper transmitting, for the MIMO mobile radio system of 4 transmitting antennas, provide the transmitting form of A, B, C tri-kinds of different transmission rates, select different transmission meanss neatly under difficult channel conditions, thus realize the overall balance of system transfers performance and transmission rate.
Launch form A(matrix A):
Launch form B(matrix B):
Launch form C(Matrix C):
When configuring transmitting form, the average multipath relative energy factor of measurements and calculations every root antenna
so:
(1) when receiving the average multipath relative energy factor
be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal equal to set antenna amount
time, channel status is CS1;
(2) when receiving the average multipath relative energy factor
be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be less than setting antenna amount
and be more than or equal to setting antenna amount
time, or receive the average multipath relative energy factor
be less than average multipath relative energy factor thresholding
and be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be more than or equal to setting antenna amount
time, channel status is CS2;
(3) when receiving the average multipath relative energy factor
be more than or equal to average multipath relative energy factor thresholding
the number of antenna of signal be less than setting antenna amount
time, channel status is CS3.
Transmitting format configuration is as shown in table 2:
Mimo wireless communication system under table 2. different channels state launches format configuration table
| Channel status | ASNR is less than Th1 (=15dB) | ASNR is more than or equal to Th1 (=15dB) and is less than Th2 (=25dB) | ASNR is more than or equal to Th2 (=25dB) |
| CS1 | Matrix A | Matrix B | Matrix B |
| CS2 | Matrix A | Matrix B | Matrix C |
| CS3 | Matrix A | Matrix B | Matrix C |
These are only statement main principle of the present invention and spirit carried out by preferred embodiment; be not limited to the present invention; for a person skilled in the art; the present invention can have various modifications and variations; all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a wireless communication system link adaptive transmission method, described method comprises the following steps:
(1) channel quality parameter is obtained, described channel quality parameter comprises one or more in average signal-to-noise ratio, signal to noise ratio deviation factors, the average multipath relative energy factor, but does not comprise signal to noise ratio deviation factors and this combination of the average multipath relative energy factor;
Described average signal-to-noise ratio is the arithmetic mean of repetitive measurement gained signal to noise ratio in section preset time; Described signal to noise ratio deviation factors is
Wherein M is the measurement total degree in section preset time, SNR
ibe the signal to noise ratio of the gained that i-th time is measured, ASNR is average signal-to-noise ratio;
The described average multipath relative energy factor is the arithmetic mean of the multipath relative energy factor in section preset time, and the described multipath relative energy factor is one of following numerical value:
The ratio of the power in a the strongest path of signal that () receives and the gross power in all the other each paths or all paths, or the ratio of the significant level absolute value in the strongest path of signal received and the significant level absolute value sum in all the other each paths or all paths;
Power and time ratio of the power in strong path in the b the strongest path of signal that () receives, or the ratio of the significant level absolute value in the significant level absolute value in the strongest path of signal received and time strong path;
(2) according to channel quality parameter, carry out the configuration of physical layer transmission technology, described physical layer transmission technology comprises one or more set of modulation system, coded system and other communication transmission technology;
Described method also comprises the step of configuration of carrying out launching form according to channel quality parameter, and described transmitting form comprises one or more the combination of diversity, multiplexing and other communication transmission technology;
Describedly carry out launching the configuration of form according to channel quality parameter and comprise the following steps:
(1) one or more average multipath relative energy factor thresholding is set, and one or more antenna amount thresholding, according to the population size of the antenna of the average multipath relative energy factor in some threshold ranges of the signal received, carry out channel status division;
The mode that described channel status divides is: set the average multipath relative energy factor first thresholding and the second thresholding, set the first antenna amount thresholding, the second antenna amount thresholding, third antenna quantity thresholding, according to the combined situation of the average multipath relative energy factor of all reception antennas, channel status is divided into one of following kind:
A (), when the number receiving the average multipath relative energy factor and be more than or equal to the antenna of the signal of the average multipath relative energy factor first thresholding is more than or equal to the first antenna amount thresholding, is the first channel status;
B () is when the number receiving the average multipath relative energy factor and be more than or equal to the antenna of the signal of the average multipath relative energy factor first thresholding is less than the first antenna amount thresholding and is more than or equal to the second antenna amount thresholding, or when receiving the average multipath relative energy factor and be less than the average multipath relative energy factor first thresholding and the number being more than or equal to the antenna of the signal of the average multipath relative energy factor second thresholding being more than or equal to third antenna quantity thresholding, be second channel state;
C (), when the number receiving the average multipath relative energy factor and be more than or equal to the antenna of the signal of the average multipath relative energy factor first thresholding is less than the second antenna amount thresholding, is the 3rd channel status;
(2) set one or more average signal-to-noise ratio thresholding, set multiple transmitting form, transmitting form is set according to the size of average signal-to-noise ratio and residing channel status;
The described size according to average signal-to-noise ratio and residing channel status are arranged to be launched the mode of form and is: setting average signal-to-noise ratio first thresholding and the second thresholding, is one of following manner according to the size of average signal-to-noise ratio and residing channel status by transmitting format configuration:
A (), for the first channel status, when average signal-to-noise ratio is less than average signal-to-noise ratio the first thresholding, is transmitting form A; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio first thresholding and is less than average signal-to-noise ratio the second thresholding, for launching form A or launching form B; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio the second thresholding, for launching form B;
B (), for second channel state, when average signal-to-noise ratio is less than average signal-to-noise ratio the first thresholding, is transmitting form A; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio first thresholding and is less than average signal-to-noise ratio the second thresholding, for launching form B or launching form C; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio the second thresholding, for launching form B or launching form C;
C (), for the 3rd channel status, when average signal-to-noise ratio is less than average signal-to-noise ratio the first thresholding, is transmitting form A; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio first thresholding and is less than average signal-to-noise ratio the second thresholding, for launching form B or launching form C; When average signal-to-noise ratio is more than or equal to average signal-to-noise ratio the second thresholding, for launching form C;
Described transmitting form A mainly provides diversity, and described transmitting form C mainly provides multiplexing, and described transmitting form B takes into account diversity and multiplexing.
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| CN103905155B (en) * | 2014-04-10 | 2017-04-05 | 广西师范大学 | A kind of link self-adaption transmission method based on signal to noise ratio statistical parameter |
| EP2959620B1 (en) * | 2014-04-30 | 2018-08-29 | Huawei Technologies Co. Ltd. | Method and apparatus for enhanced slow link adaptation in a wireless communication system |
| CN105163387B (en) * | 2015-10-15 | 2018-09-25 | 南京新联电子股份有限公司 | 230MHz wireless private network end modification speed self-adaption methods |
| CN109525303B (en) * | 2018-11-30 | 2021-04-02 | 四川安迪科技实业有限公司 | Adaptive modulation coding control method based on satellite communication |
| CN115348610B (en) * | 2022-10-18 | 2023-03-24 | 成都市以太节点科技有限公司 | Millimeter wave multilink self-adaptive communication method, electronic equipment and storage medium |
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| CN102694608A (en) * | 2012-05-22 | 2012-09-26 | 广西师范大学 | Method and device for preferable selection of transmission techniques of transceiving equipment of wireless mobile communication system |
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