CN107395257B - LTE-based system and signal transmitting method thereof - Google Patents

LTE-based system and signal transmitting method thereof Download PDF

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CN107395257B
CN107395257B CN201710810640.2A CN201710810640A CN107395257B CN 107395257 B CN107395257 B CN 107395257B CN 201710810640 A CN201710810640 A CN 201710810640A CN 107395257 B CN107395257 B CN 107395257B
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lte
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CN107395257A (en
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陈国栋
陈进奇
董润
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Nanjing Sanqiang Electronic Communication Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0066—Requirements on out-of-channel emissions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The signal transmitting method based on the LTE system deduces the most suitable matching relation of the pilot frequency iterative estimation and the resource allocation of the LTE link according to the LTE capacity of the multi-communication terminal on the basis of considering the estimation error of the link of the multi-communication terminal LTE system and the dispatching of the communication terminals in the multi-communication terminal environment, adopts the most suitable pilot frequency signal power to transmit pilot frequency signals with the number equal to that of the transmitting antennas of the base station and transmits data, optimizes the accuracy of the link estimation and improves the throughput performance of the LTE link.

Description

LTE-based system and signal transmitting method thereof
Technical Field
The invention relates to the field of wireless communication, in particular to a signal transmitting method based on an LTE system.
Background
LTE (Long Term Evolution) is performed by 3GPP (The 3)rdThe long term evolution of the UMTS (Universal mobile telecommunications System) technical standard, developed by the GenerationPartnership Project) organization, was formally established and initiated at the 3GPP toronto TSGRAN #26 conference in 12 months 2004. The LTE system introduces OFDM (orthogonal frequency Division Multiplexing) and MIMO (Multi-Input)&Multi-Output, multiple-input multiple-Output) and other key transmission technologies, the frequency spectrum efficiency and the data transmission rate are obviously increased (under the condition of 64QAM, 2X2MIMO with 20M bandwidth is adoptedConsidering that the maximum downlink transmission rate is 201Mbps, and is about 140Mbps after removing signaling overhead, but according to practical networking and terminal capability limitations, the downlink peak rate is generally considered to be 100Mbps, and the uplink is 50Mbps), and various bandwidth allocations are supported: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz and the like, and supports the global mainstream 2G/3G frequency band and some newly-added frequency bands, thereby the frequency spectrum allocation is more flexible, and the system capacity and the coverage are also obviously improved. The LTE system network architecture is more flat and simplified, and the complexity of network nodes and the system is reduced, so that the system time delay is reduced, and the network deployment and maintenance cost is also reduced. The LTE system supports interoperation with other 3GPP systems. The LTE system has two systems: FDD-LTE and TDD-LTE, i.e. frequency division duplex LTE systems and time division duplex LTE systems, the main difference between the two technologies is on the physical layer of the air interface (like frame structure, time division design, synchronization, etc.). The air interface uplink and downlink transmission of the FDD-LTE system adopts a pair of symmetrical frequency bands to receive and transmit data, and the uplink and downlink of the TDD-LTE system adopts the same frequency band to transmit on different time slots, so that TDD has higher frequency spectrum utilization rate compared with an FDD duplex mode.
However, in the multi-communication terminal LTE system, besides the problems of link estimation errors and the like that are common to the single-communication terminal LTE system, the multi-communication terminal LTE system also has the problems of multi-terminal diversity, inter-terminal interference, multi-terminal scheduling and the like, which makes the best-fit matching relationship between the pilot frequency iterative estimation and the resource configuration, which has been obtained from the analysis of the single-communication terminal LTE system, unsuitable for the multi-communication terminal LTE system, so that the best-fit matching relationship between the pilot frequency iterative estimation and the resource configuration of the broadcast link of the multi-communication terminal LTE system is worthy of study.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
According to an embodiment of the present invention, a signal transmission method based on an LTE system is provided, the method including the steps of:
s1, under the condition of link Rayleigh fading, presetting that the maximum number of transmitting symbols T in a data packet is more than the number M of transmitting antennas of a base station, and the base station rootDetermining the most suitable pilot signal power according to the most suitable matching relation between the pilot frequency iterative estimation and the resource allocation
Figure BDA0001403758920000021
M pilot signals are transmitted to a communication terminal having only one receive antenna.
S2, the communication terminal performs link estimation using the reception matrix for the pilot signal.
S3, presetting the number K of communication terminals in the system not less than the number M of base station transmitting antennas, the base station selecting the transmitting communication terminal group according to the communication terminal link information returned by the communication terminal.
S4, transmitting T-M data symbols at the system data power Pd for the selected M transmitting communication terminals in the data packet.
According to an embodiment of the present invention, the determining the best-fit pilot signal power according to the best-fit matching relationship between the pilot iterative estimation and the resource allocation at S1 includes:
when the maximum number of transmitted symbols T in a data packet satisfies M < T < 2M-1, the most suitable pilot signal power
Figure BDA0001403758920000022
Wherein P is statistical uniform transmitting power, process parameter
Figure BDA0001403758920000023
Transmitting pilot signals
Figure BDA0001403758920000024
According to an embodiment of the present invention, the determining the best-fit pilot signal power according to the best-fit matching relationship between the pilot iterative estimation and the resource allocation at S1 includes:
when the maximum number of transmitted symbols T in a data packet satisfies T2M-1, the most suitable pilot signal power
Figure BDA0001403758920000025
Wherein P is statistical uniform transmitting power, process parameter
Figure BDA0001403758920000026
Transmitting pilot signals
Figure BDA0001403758920000031
According to an embodiment of the present invention, the determining the best-fit pilot signal power according to the best-fit matching relationship between the pilot iterative estimation and the resource allocation at S1 includes:
when the maximum number of transmitted symbols T in a data packet satisfies T > 2M, the most suitable pilot signal power
Figure BDA0001403758920000032
Wherein P is statistical uniform transmitting power, process parameter
Figure BDA0001403758920000033
Transmitting pilot signals
Figure BDA0001403758920000034
According to an embodiment of the present invention, the performing, by the communication terminal at S2, link estimation using a reception matrix for pilot signals specifically includes:
setting the number of communication terminals in the system as K, wherein the link impact response of any communication terminal K is hk＝[hk1，hk2，...，hkM]White gaussian noise nk＝[nk1，nk2，...，nkM]The receive matrix for the pilot signal is:
Figure BDA0001403758920000035
and obtaining a link estimation result as the k link information of the communication terminal:
Figure BDA0001403758920000036
and returns it to the base station.
According to an embodiment of the present invention, the selecting, by the base station of S3, the transmitting communication terminal group according to the communication terminal link information returned by the communication terminal includes:
s31, initializing the waiting communication terminal group 1 ═ { 1.., K }, and selecting the first transmitting communication terminal
Figure BDA0001403758920000041
Setting a transmitting communication terminal identification number i to be 2;
s32, adjusting the group of the waiting communication terminals,
Figure BDA0001403758920000042
wherein the content is 0.4,
Figure BDA0001403758920000043
link information indicating the nth transmitting communication terminal;
s33, selecting the ith transmitting communication terminal
Figure BDA0001403758920000044
Adjusting the identification number i of the transmitting communication terminal to be i + 1; if i < M, go to step S32;
s34, the finally determined transmitting communication terminal group is { pi (1),.. and pi (M) }, and the number of the selected transmitting communication terminals is equal to the number M of the base station transmitting antennas;
the system data power of S4 according to the embodiment of the invention
Figure BDA0001403758920000045
The signal transmitting method based on the LTE system deduces the most suitable matching relation of the pilot frequency iterative estimation and the resource allocation of the LTE link according to the LTE capacity of the multi-communication terminal on the basis of considering the estimation error of the link of the multi-communication terminal LTE system and the dispatching of the communication terminals in the multi-communication terminal environment, adopts the most suitable pilot frequency signal power to transmit pilot frequency signals with the number equal to that of the transmitting antennas of the base station and transmits data, optimizes the accuracy of the link estimation and improves the throughput performance of the LTE link.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a flow chart of a signal transmission method based on an LTE system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to an embodiment of the present invention, a signal transmission method based on an LTE system is provided, as shown in fig. 1, the method includes the steps of:
s1, under the condition of link Rayleigh fading, presetting that the maximum number of transmitting symbols T in a data packet is greater than the number M of transmitting antennas of a base station, and the base station iteratively estimates according to the pilot frequencyDetermining the most suitable pilot signal power according to the most suitable matching relation with the resource allocation
Figure BDA0001403758920000051
M pilot signals are transmitted to a communication terminal having only one receive antenna.
The determining the most suitable pilot signal power according to the most suitable matching relationship between the pilot iterative estimation and the resource allocation comprises:
when the maximum number of transmitted symbols T in a data packet satisfies M < T < 2M-1, the most suitable pilot signal power
Figure BDA0001403758920000052
Wherein P is statistical uniform transmitting power, process parameter
Figure BDA0001403758920000053
Transmitting pilot signals
Figure BDA0001403758920000054
When the maximum number of transmitted symbols T in a data packet satisfies T2M-1, the most suitable pilot signal power
Figure BDA0001403758920000055
Wherein P is statistical uniform transmitting power, process parameter
Figure BDA0001403758920000056
Transmitting pilot signals
Figure BDA0001403758920000061
When the maximum number of transmitted symbols T in a data packet satisfies T > 2M, the most suitable pilot signal power
Figure BDA0001403758920000062
Wherein P is statistical uniform transmitting power, process parameter
Figure BDA0001403758920000063
Transmitting pilot signals
Figure BDA0001403758920000064
S2, the communication terminal performs link estimation using the reception matrix for the pilot signal:
setting the number of communication terminals in the system as K, wherein the link impact response of any communication terminal K is hk＝[hk1，hk2，...，hkM]White gaussian noise nk＝[nk1，nk2，...，nkM]The receive matrix for the pilot signal is:
Figure BDA0001403758920000065
and obtaining a link estimation result as the k link information of the communication terminal:
Figure BDA0001403758920000066
and returns it to the base station;
s3, presetting the number K of communication terminals in the system to be not less than the number M of base station transmitting antennas, the base station selecting the transmitting communication terminal group according to the communication terminal link information returned by the communication terminal, specifically including the steps of:
s31, initializing the waiting communication terminal group 1 ═ { 1.., K }, and selecting the first transmitting communication terminal
Figure BDA0001403758920000071
Setting a transmitting communication terminal identification number i to be 2;
s32, adjusting the group of the waiting communication terminals,
Figure BDA0001403758920000072
wherein the content is 0.4,
Figure BDA0001403758920000073
link information indicating the nth transmitting communication terminal;
s33, selecting the ith transmitting communication terminal
Figure BDA0001403758920000074
Adjusting the identification number i of the transmitting communication terminal to be i + 1; if i < M, go to step S32;
s34, the finally determined transmitting communication terminal group is { pi (1),.. and pi (M) }, and the number of the selected transmitting communication terminals is equal to the number M of the base station transmitting antennas;
s4, transmitting T-M data symbols in the data packet at system data power Pd for the selected M transmitting communication terminals
Figure BDA0001403758920000075
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (1)

1. A signal transmitting method based on an LTE system, wherein the LTE system adopts a time division duplex LTE system, and the method comprises the following steps:
s1 Rayleigh in linkUnder the fading condition, the maximum number of transmitting symbols T in a data packet is preset to be larger than the number M of transmitting antennas of a base station, and the base station determines the most suitable pilot signal power according to the most suitable matching relation between pilot frequency iterative estimation and resource allocation
Figure DEST_PATH_IMAGE001
Transmitting M pilot signals to a communication terminal having only one receiving antenna;
s2, the communication terminal carries out link estimation by using the receiving matrix of the pilot signal;
s3, presetting the number K of communication terminals in the system to be not less than the number M of base station transmitting antennas, and selecting a transmitting communication terminal group by the base station according to the communication terminal link information returned by the communication terminal;
s4, in the data packet, the system data power P is used for the selected M transmitting communication terminalsdTransmitting T-M data symbols;
the determining the best-fit pilot signal power according to the best-fit matching relationship between the pilot iteration estimation and the resource allocation of S1 includes:
when the maximum number of transmitted symbols T in a data packet satisfies T2M-1, the most suitable pilot signal power
Figure 492687DEST_PATH_IMAGE002
Wherein P is statistical uniform transmitting power, process parameter
Figure DEST_PATH_IMAGE003
Transmitting pilot signals
Figure 940986DEST_PATH_IMAGE004
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