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Multi-user communication method and multi-user communication device for code division multiple access

A technology for code division multiple access and multi-user communication, which is applied in the field of communication, and can solve the problem of non-orthogonal code division multiple access with poor performance, interference between users that cannot be randomized or averaged, and randomized issues such as normalization or averaging, to achieve the effect of improving multi-access performance

Active Publication Date: 2016-05-18
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is convenient for the receiver to use the serial interference cancellation technology, and can simplify the implementation process of the serial interference cancellation, but the single spread sequence scheme cannot be effectively randomized or averaged due to the interference between users. , so it is unfavorable to the access performance of non-orthogonal code division multiple access
[0016] Aiming at the problem in related technologies that one user only uses one spreading sequence to spread all the modulation symbols, the interference between users cannot be effectively randomized or averaged, and no effective technical solution has been proposed

Method used

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  • Multi-user communication method and multi-user communication device for code division multiple access
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  • Multi-user communication method and multi-user communication device for code division multiple access

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Embodiment 1

[0118] Figure 6 It is a flow chart of transmitter signal processing according to preferred embodiment 1 of the present invention, such as Figure 6 As shown, this embodiment provides a multi-user code division multiple access communication method and a corresponding transmitter and receiver. The transmitter (such as the terminal in the transceiver system, also known as the terminal transmitter) processes the signal such as Figure 6 As shown, the data bits to be sent are coded and modulated first to obtain several data symbols. Here, it is assumed that a code block obtained by the channel coder is modulated to obtain N data symbols, and the N data symbols use N non-identical The spread sequence is extended to obtain the extended symbol sequence, and N non-identical spreading sequences are used to spread to achieve the purpose of randomizing interference between users; the extended symbol sequence is then modulated by the carrier to form a transmission signal and then transmi...

Embodiment 2

[0132]Embodiment 2 of the present invention provides a multi-user code division multiple access communication method and a corresponding transmitter and receiver. The transmitter (such as the terminal in the transceiver system, also known as the terminal transmitter) processes the signal such as Figure 6 As shown, the data bits to be sent are coded and modulated first to obtain several data symbols. Here, it is assumed that a code block obtained by the channel coder is modulated to obtain N data symbols, and the N data symbols use N non-identical The spread sequence is extended to obtain the extended symbol sequence, and N non-identical spreading sequences are used to spread to achieve the purpose of randomizing interference between users; the extended symbol sequence is then modulated by the carrier to form a transmission signal and then transmitted.

[0133] The flow of the multi-user code division multiple access communication method on the transmitter side of the preferre...

Embodiment 3

[0142] The preferred embodiment of the present invention provides a multi-user code division multiple access communication method and a corresponding transmitter and receiver. The transmitter (such as the terminal in the transceiver system, also known as the terminal transmitter) processes the signal such as Figure 6 As shown, the data bits to be sent are coded and modulated first to obtain several data symbols. Here, it is assumed that a code block obtained by the channel coder is modulated to obtain N data symbols, and the N data symbols use N non-identical The spread sequence is extended to obtain the extended symbol sequence, and N non-identical spreading sequences are used to spread to achieve the purpose of randomizing interference between users; the extended symbol sequence is then modulated by the carrier to form a transmission signal and then transmitted.

[0143] The flow of the multi-user code division multiple access communication method on the transmitter side of...

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Abstract

The invention provides a multi-user communication method and a multi-user communication device for code division multiple access. The method comprises the following steps: acquiring N modulation symbols obtained by modulating a code block encoded by a channel encoder, wherein N is a positive integer greater than or equal to 2; extending the N modulation symbols according to N extended sequences of specific length, wherein there are at least two different extended sequences among the N extended sequences of specific length; and sending the extended modulation symbols. By adopting the technical scheme provided by the invention, the problem that the interference between users cannot be effectively randomized or averaged as a user only uses one extended sequence to extend all the modulation symbols in the related technologies is solved, the multiple access performance is improved, every access user can uses a variety of different extended sequences to extend the modulation symbols, and the interference between users can be effectively randomized or averaged.

Description

technical field [0001] The present invention relates to the communication field, in particular to a multi-user communication method and device for code division multiple access. Background technique [0002] Uplink multi-user access can be through different multiple access technologies such as: time division multiple access (TimeDivisionMultipleAccess, TDMA), frequency division multiple access (FrequencyDivisionMultipleAccess, FDMA), code division multiple access (CodeDivisionMultipleAccess, CDMA) and space division multiple access ( Space Division Multiple Access, SDMA). Among them, multi-user code division multiple access communication technology is a very important category of uplink multi-user access communication technology, which can provide excellent access performance, and thus has been adopted by many wireless communication standards. [0003] In the access process using code division multiple access, first, each access terminal first uses a spreading sequence of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/00
CPCH04L27/26H04J13/10H04J13/107H04B1/707H04B7/2628H04J13/0022H04L1/0009H04L27/2042
Inventor 袁志锋李卫敏
Owner ZTE CORP
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