Equipment and method for mapping variable sub carriers

A subcarrier mapping and carrier mapping technology, applied in the field of data transmission, can solve the problems of low power efficiency of radio frequency amplifiers, increased receiving buffer, increased average delay, etc., to increase system throughput, increase effects, and reduce average weight The effect of the number of passes

Inactive Publication Date: 2007-02-21
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1) It is sensitive to frequency offset and phase noise, which is easy to cause attenuation;
[0011] 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

Method used

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  • Equipment and method for mapping variable sub carriers
  • Equipment and method for mapping variable sub carriers
  • Equipment and method for mapping variable sub carriers

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0113] Example 1.

[0114] Different bit interleaving methods are used for each transmission of HARQ, and the bit interleaving method keeps the mapping relationship between bits and modulation symbols unchanged.

[0115] The number of bits contained in a HARQ transmission packet is N:

[0116] N=m×n (5)

[0117] Among them, m is the number of bits included in each modulation symbol; n is the number of modulation symbols included in the HARQ transmission data packet. With block interleaving, the number of given block interleaver columns is n C , the number of block interleaver rows is determined according to the number of bits contained in the HARQ transmission data packet:

[0118]

[0119] where: n R is the number of block interleaver rows; n C is the number of block interleaver columns; n is the number of bits contained in the HARQ transmission data packet.

[0120] The data bits are input into the bit interleaver row by row as follows: The sequenc...

Example Embodiment

[0160] Example 2.

[0161] Different bit interleaving methods are used for each transmission of HARQ, and the bit interleaving method can change the mapping relationship between bits and modulation symbols.

[0162] The number of bits contained in a HARQ transmission packet is N:

[0163] N=m×n (9)

[0164] Among them, m is the number of bits included in each modulation symbol; n is the number of modulation symbols included in the HARQ transmission data packet.

[0165] Using the block interleaving method, given the number of block interleaver columns C, the number of block interleaver rows determined according to the number of bits included in the HARQ transmission data packet is:

[0166]

[0167] Where: R is the number of block interleaver rows; C is the number of block interleaver columns; N is the number of bits included in the HARQ transmission data packet.

[0168] Input the data bits into the bit interleaver row by row, the data bit sequence is X...

Example Embodiment

[0199] Example 3.

[0200] The number n of modulation symbols contained in a given HARQ transmission packet d , corresponding to n s subcarriers, n d =n s . this n s The subcarriers may be continuous in the frequency domain, may be discrete, may be partially continuous and partially discrete, such as Figure 10 shown. Maximum number of HARQ transmissions n max . The following algorithm is used to determine the HARQ jth (0≤jmax ) times transmission, the subcarrier corresponding to each modulation symbol:

[0201]

[0202] Among them: k(0≤ks ) is the sequence number of the subcarriers; i (0≤id ) is the sequence number of modulation symbols; n d is the number of modulation symbols contained in the HARQ transmission data packet; n s The number of subcarriers used for HARQ data transmission; n max is the maximum number of HARQ transmissions; j(0≤jmax ) is the number of HARQ transmissions.

[0203] The above method is also applicable to SC-FDMA, its transmitter / receiv...

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Abstract

The method comprises: the sending end uses different bit interlace approach for each time of HARQ (hybrid automatic repeat request) transmission; the sending end modulates the modulation symbol to each sub-carrier wave to transmit. The invention implements the transmission of same bit on different sub-carrier waves in each transmission of same HARQ process so as to increase the effect of frequency diversity and to improve the failure probability of HARQ transmission caused certain bits always transmitted in a deeply fading sub-carrier wave.

Description

technical field [0001] The invention relates to data transmission in a wireless communication system, in particular to a variable subcarrier mapping device and method. 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. To meet the above requirements, AMC, HARQ, OFDM (A) multiple access (including Localized OFDM and Distributed OFDM), and SC-FDMA are technical solutions that are currently being evaluated and possibly adopted by the next generation mobile communication system. For the uplink and downlink data services, the hybr...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L27/26
Inventor 步兵李小强张玉建李周镐
Owner BEIJING SAMSUNG TELECOM R&D CENT
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