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Cooperative transmission method suitable for distributed antenna system, base station and terminal

A distributed antenna and cooperative transmission technology, applied in diversity/multi-antenna systems, radio transmission systems, transmission systems, etc., can solve problems such as excessive reception time difference, imperfect backbone network devices, and reduced system spectral efficiency, etc. Effective transmission rate, the effect of solving the problem of asynchronous signal arrival

Active Publication Date: 2016-04-06
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, even if a longer subframe setting is used in low-band communication, the reception time difference may be too large due to the delay of the backbone network or the imperfection of the device
On the other hand, although the use of CP simply solves the problem of channel delay expansion, CP also reduces the spectral efficiency of the system
Due to the delay difference phenomenon of the above-mentioned distributed antenna system, the system may need a longer CP to ensure the reliability of signal reception, which will undoubtedly further reduce the spectral efficiency of the system

Method used

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  • Cooperative transmission method suitable for distributed antenna system, base station and terminal
  • Cooperative transmission method suitable for distributed antenna system, base station and terminal
  • Cooperative transmission method suitable for distributed antenna system, base station and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Embodiment 1: This embodiment describes a wireless communication system using a shaping filter bank based multi-carrier (FBMC) modulation technique.

[0092] Table 1

[0093] System bandwidth (System bandwidth (MHz))

250

Sampling rate (Sampling rate (MHz))

276.48

Carrier spacing (Subcarrier spacing (kHz))

270

OFDM symbol length (OFDM symbol length (FFT size))

1024

OFDM symbol duration (OFDM symbol duration(us))

3.70

CP length (CP length)

128

CP duration (CP duration(us))

0.46

[0094] In this embodiment, a specific implementation of a wireless communication system based on a shaping filter bank multi-carrier modulation technology is given. For the convenience of understanding, the system is compared with a traditional OFDM system: assuming that the parameters of the OFDM system are shown in Table 1, an OFDM time domain signal can be generated by formula (1):

[0095] s ...

Embodiment 2

[0106] Embodiment 2: This embodiment describes an active cooperative transmission method of a multi-antenna system.

[0107] first, image 3 A distributed antenna system based on OFDM modulation is shown. The network transmits data of two users at the same time through two antennas 1 and 2, and through an Orthogonal Frequency Division Multiplexing (OFDMA) method. Due to the distance difference between the user and the antenna, the two signals (from antenna 1 and 2) received by the user (for example, user A) have a time difference at the receiving end, which is called a delay difference in this application. For example, the distribution of users and antennas is as follows image 3 As shown, the delay difference at user A is τ=(D2-D1) / 3*10 8 =0.46us, where, 3*10 8 m / s is the speed of light. If the parameters used by the system are shown in Table 1, it can be seen that the delay difference has exceeded the length of the CP, and the received signal is as follows image 3 sho...

Embodiment 3

[0110] Embodiment 3: This embodiment describes the measurement, feedback and adjustment of the antenna time delay.

[0111] In the second embodiment, the active cooperative transmission method adjusts the transmission time of the antennas or adjusts the parameters of the modulation waveform according to the delay of each antenna reaching the user. This requires the network to be able to obtain the delay difference between each antenna and the user first. Obtaining the delay difference can be achieved through various methods. This embodiment introduces a method through user measurement and feedback:

[0112] The network allocates an independent reference signal for each antenna, such as the CSI-RS reference signal in the LTE system. The reference signal is sent using a user-independent reference time, so the user can always obtain the transmission delay of the corresponding antenna by measuring the reference signal. A set of delay difference thresholds is predefined. When the...

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Abstract

The invention discloses a cooperative transmission method suitable for a distributed antenna system. The cooperative transmission method comprises the steps of determining a signal transmission manner which is used by each antenna according to a channel relationship between each antenna and a terminal in the distributed antenna system; and transmitting a signal to one or a plurality of terminals by each antenna in a corresponding signal transmission manner. The invention also discloses a corresponding base station and a terminal. The cooperative transmission method provided by the invention can effectively settle a problem of asynchronous signal arrival from a plurality of antennae and always ensures a fact that a user can always receive signals from different antennae in a relatively good manner, thereby obtaining a maximal effective transmission rate.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a cooperative transmission method, a base station and a terminal applicable to a distributed antenna system. Background technique [0002] With the rapid development of the information industry, the future wireless communication technology is facing unprecedented challenges. In the foreseeable future, the global demand for wireless data services will maintain high-speed growth. According to the ITU report, by 2020, wireless data services will increase by at least 1000 times. In some countries and regions, this number may be higher. In order to meet this unprecedented challenge, extensive 5G communication technology research has been carried out all over the world. Among them, the increase of spectrum efficiency is recognized as the key to the 1000-fold business growth in parallel with the increase of new frequency band resources and frequency reuse...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04W56/00H04B7/04
CPCH04L27/2646H04L27/2655H04W56/0045H04B7/0689H04B7/024H04L27/2654H04L27/26416H04W72/541H04W16/28
Inventor 孙鹏飞喻斌
Owner BEIJING SAMSUNG TELECOM R&D CENT
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