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Weighted fraction Fourier transform domain double-time-slot diversity and multiplexing cooperated transmission method

A fractional Fourier and cooperative transmission technology, which is applied in the field of cooperative transmission of dual-slot diversity and multiplexing, can solve the problems that single-antenna systems cannot achieve diversity gain and multiplexing gain, and improve diversity gain and diversity gain Effect

Active Publication Date: 2019-02-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing single-antenna system cannot achieve both diversity gain and multiplexing gain

Method used

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  • Weighted fraction Fourier transform domain double-time-slot diversity and multiplexing cooperated transmission method
  • Weighted fraction Fourier transform domain double-time-slot diversity and multiplexing cooperated transmission method
  • Weighted fraction Fourier transform domain double-time-slot diversity and multiplexing cooperated transmission method

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specific Embodiment approach 1

[0029] Specific implementation mode one: as figure 1 and figure 2 As shown, the weighted fractional Fourier transform domain dual-slot diversity and multiplexing coordinated transmission method described in this embodiment includes the following steps:

[0030] Step 1. Data d sent by the user at the sending end 1 Perform modulation to obtain the modulated baseband data s at the transmitting end 1 , and baseband data s at the sender 1 Carry out zero padding processing to obtain the data after zero padding processing;

[0031] Step 2. Perform a weighted fractional Fourier transform with an order of α on the zero-padding data obtained in step 1, and obtain the weighted fractional Fourier transformed data w 1 ;

[0032] Step 3, the data w obtained in step 2 1 Modulate to the corresponding carrier frequency to obtain the modulated data X 1 , and transmit a signal X through the antenna 1 , signal X 1 After being transmitted through the channel, it reaches the receiving end...

specific Embodiment approach 2

[0043] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the specific process of the step one is:

[0044] The user at the sending end sends data in a manner of equal probability and energy sharing, and the sent data d 1 The vector form of is:

[0045]

[0046] In the formula, s m (t) is M signal waveforms in digital phase modulation, M is M possible phases of the carrier, m=1, 2,..., M, used to transmit sending information, s m (t) represents the correspondence between each m and the transmitted signal, ε g is the energy of the signal pulse;

[0047] The data sent by the user at the sending end d 1 Perform modulation to obtain the modulated baseband data s at the transmitting end 1 ;

[0048] The signal generator at the sending end generates a series of m sequences, and each point passes through s m (t) corresponds to a modulated symbol, and these symbols finally form the transmission sequence ...

specific Embodiment approach 3

[0051] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that the data d sent to the user at the sending end in step 1 1 For modulation, the modulation method adopted is the phase shift keying BPSK method.

[0052] For the phase-shift keying BPSK method of this embodiment, the modulated signal is a series of 01 sequences, and the present invention is compatible with various modulation methods, and this embodiment takes the phase-shift keying BPSK method as an example.

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Abstract

A weighted fraction Fourier transform domain double-time-slot diversity and multiplexing cooperated transmission method belongs to the field of wireless communication technology. The method settles aproblem that diversity gain and multiplexing gain cannot be realized in an existing single-antenna system. The method utilizes double-time-slot expansion and weighted fraction Fourier technology. Through expanding a single-time-slot signal to double time slots, fraction domain calculation and transmission are successively performed, thereby realizing diversity gain and multiplexing gain in the single-antenna system. In the method of the invention, a receiving end can receive multiple data signals through de-multiplexing, thereby supplying higher user accommodation amount to the system, and realizing relatively high integral system performance. The method according to the invention can be applied to the field of wireless communication technology.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a coordinated transmission method of dual time slot diversity and multiplexing. Background technique [0002] The reliability and effectiveness of the system are two optimization directions of the wireless transmission system, represented by diversity gain and multiplexing gain respectively. At present, the information transmission technology in the single-antenna scenario is difficult to achieve both. Taking time diversity technology as an example, this solution transmits the same signal from the same user in different time slots of the same frequency band, thus greatly reducing the receiving end. Error probability ensures reliable transmission for users, but this scheme wastes time-frequency resources and cannot provide multiplexing gains for multi-user applications. However, the traditional multiplexing technology cannot maintain the system gain in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/02H04L27/26
CPCH04B7/028H04L27/2634H04L27/265
Inventor 沙学军冯雨晴马聪高宗右
Owner HARBIN INST OF TECH
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