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Equipment and method of subcarrier mapping of circulation shifting

A technology of subcarrier mapping and carrier mapping, which is applied in the field of cyclically shifted subcarrier mapping, can solve problems such as subcarrier fading, low power efficiency of radio frequency amplifiers, and increased average delay, so as to shorten the average transmission delay and increase System throughput, the effect of reducing the average number of retransmissions

Inactive Publication Date: 2007-07-18
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1) It is sensitive to frequency offset and phase noise, which is easy to cause attenuation;
[0012] 2) The ratio of peak-to-average power (PAPR) is large, which will lead to low power efficiency of the RF amplifier;
Because the increase of N will lead to the increase of the receiving buffer (N HARQ processes correspond to N buffers for soft combining)
At the same time, the increase of N will lead to the increase of the average delay (average delay = HARQ average retransmission times × N × TTI)
To sum up, a problem that exists when the next generation mobile communication system adopts the HARQ transmission mechanism is that the channel fading experienced by the retransmitted data packet of a HARQ process is similar to that experienced by the data packet transmitted by the HARQ process N TTI time ago , that is, some subcarriers used by a HARQ process experience deep fading in one transmission, and these subcarriers will still experience deep fading during retransmission
Therefore, considering the significant impact on PAPR, variable bit (modulation symbol) interleaver is not suitable for uplink information transmission

Method used

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  • Equipment and method of subcarrier mapping of circulation shifting
  • Equipment and method of subcarrier mapping of circulation shifting
  • Equipment and method of subcarrier mapping of circulation shifting

Examples

Experimental program
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Effect test

Embodiment 1

[0125] Embodiment 1. The subcarriers used by the sending end are distributed continuously, and the cyclic shift distance is fixed

[0126] As shown in FIG. 9 , the subcarriers used by the sending end to send data are distributed continuously (64 subcarriers), and the maximum number of retransmissions of HARQ is 3. The subcarrier numbers 1 to 64 are the sequence numbers of the subcarriers used by the sending end, and the modulation symbol numbers 1 to 64 are the sequence numbers of the modulation symbols at the sending end. By cyclically shifting the mapping relationship during initial transmission downward by 20 subcarriers, the mapping relationship between modulation symbols and subcarriers during one retransmission is obtained. The mapping relationship between modulation symbols and subcarriers in the second retransmission is obtained by cyclically shifting the mapping relationship in the first retransmission downward by 20 subcarriers.

Embodiment 2

[0127] Embodiment 2. Discrete distribution of subcarriers used by the sender to send data, variable cyclic movement distance

[0128] As shown in FIG. 10 , the subcarriers used by the sending end to send data are distributed discretely (128 subcarriers), and the maximum number of retransmissions of HARQ is 3. The subcarrier numbers 1-128 are the sequence numbers of the subcarriers used by the sending end, and the modulation symbol numbers 1-128 are the sequence numbers of the modulation symbols at the sending end. By cyclically shifting the mapping relationship of the initial transmission downward by 40 subcarriers, the mapping relationship between modulation symbols and subcarriers during a retransmission is obtained. The mapping relationship between modulation symbols and subcarriers in the second retransmission is obtained by cyclically shifting the mapping relationship in the first retransmission downward by 30 subcarriers.

[0129] The present invention has following eff...

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Abstract

This invention relates to a sub-carrier mapping method for circular shift at the transmission end including: corresponding input several digit data bits to a certain symbol in the modulated symbol set to output corresponding modulated symbols, circularly shifting the mapping relation between the modulated symbols last time and the sub-carrier to get the mapping relation of the symbol should be applied in transmission this time and sub-carriers to modulate the symbols onto each sub-carrier, which can realize that same bits in the transmission of a same HARQ process are transmitted on different sub-carries to get the frequency diversity gain and reduce the probability of failing transmission of HARQ because some bits are always transmitted on deep declined sub-carriers.

Description

technical field [0001] The present invention relates to the technical field of data transmission in a wireless communication system, in particular to a device and method for cyclically shifted subcarrier mapping. Background technique [0002] Compared with the current 3G system, the next-generation evolved mobile communication system will provide shorter transmission delay (including access, air interface transmission, network processing and network transmission time), higher user uplink and downlink data Transmission rate, higher spectrum utilization, larger system coverage, and at the same time reduce the network construction cost and operation and maintenance cost of the network operator as much as possible. In order to meet the above requirements, AMC, HARQ, OFDM (A) multiple access (including localized OFDM (Localized OFDM) and distributed OFDM (Distributed OFDM)), and SC-FDMA are currently being evaluated and possibly adopted by the next generation mobile communication...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02H04L1/18H04L27/26
CPCH04L1/1819H04L27/2608H04L27/2634
Inventor 步兵李小强张玉建李周镐
Owner BEIJING SAMSUNG TELECOM R&D CENT
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