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Rate matching method in LTE (Long Term Evolution) downlink system

A technology of rate matching and matching output, which is applied in the field of coding and modulation, can solve problems such as the unsatisfactory transmission rate of the 3G system, and achieve the effect of reducing complexity and improving bit error rate

Inactive Publication Date: 2012-01-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0002] The emergence of 3G mobile communication has brought a lot of convenience to people, but with the continuous emergence of new services, the transmission rate of the current 3G system is far from meeting the growing needs of people

Method used

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  • Rate matching method in LTE (Long Term Evolution) downlink system
  • Rate matching method in LTE (Long Term Evolution) downlink system
  • Rate matching method in LTE (Long Term Evolution) downlink system

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Embodiment

[0031] figure 1 It is the rate matching block diagram of 3GPP LTE for Turbo coding.

[0032] Such as figure 1 As shown, at the sending end, three information bit streams from the Turbo encoder, one system bit stream Two parity bit streams After sub-block interleaving, output three-way sequence After bit collection, that is, merging, the bit sequence is obtained and temporarily stored in the circular buffer, and finally the bit sequence in the circular buffer is filled or punctured, and finally the matching output sequence e of the target length is obtained k .

[0033] figure 2 It is a processing flowchart of a rate matching method in an LTE downlink system in the prior art.

[0034] In this process, the system bit stream check bit stream 1 check bit stream 2 These three bit streams After sub-block interleaving, three output sequences are obtained after interleaving where K π is the weaving length. The combination method is to firstly combine the interlea...

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Abstract

The invention discloses a rate matching method in an LTE (Long Term Evolution) downlink system, wherein specific to a 3GPP (The 3rd Generation Partnership Project) LTE downlink system, a transmission channel model based on Turbo codes is proposed, and circulatory filling and interlaced punching are adopted in the rate matching method in the LTE downlink system. In the invention, the rate matchingmethod comprises the steps of: firstly, performing bit collection by adopting a system-verification information bit stream interlaced combination method, and then adding or removing a corresponding number of bits to obtain corresponding code rate by adopting a circulatory filling or interlaced punching method specific to the collected bit stream, thereby realizing rate matching. Experimental tests show that compared with the traditional LET rate matching method, the rate matching method disclosed by the invention can be used for effectively increasing a false bit error rate (BER) performance.In addition, the rate matching method in the LET downlink system has the advantages that the positioning and deleting of dummy bits are omitted, the computational complexity is lowered, and the realizability of an algorithm on software and hardware is increased.

Description

technical field [0001] The invention belongs to the technical field of coding and modulation in communication systems, and more specifically, relates to a rate matching method in an LTE downlink system. Background technique [0002] The emergence of 3G mobile communication has brought a lot of convenience to people, but with the continuous emergence of new services, the transmission rate of the current 3G system is far from meeting people's growing needs. In order to ensure effective competitiveness in the next ten years or even longer, the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) decided to carry out the long-term evolution (Long Term Evolution, Universal Mobile Telecommunications System, UMTS) technology of the mobile communication system, LTE) project. The launch of the LTE project curbed the rapid rise of the World interoperability for Microwave Access (WiMAX) technology and was able to compete with the broadband technology proposed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 隆克平刘健余龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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