Method for randomizing neighborhood cell interference in OFDM system

An adjacent cell interference and randomization technology, applied in the field of OFDM systems, can solve the problems of high complexity and demand, and achieve the effect of improving the degree of randomization and improving the anti-interference performance.

Inactive Publication Date: 2009-03-18
ZTE CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use special technology to estimate the interference and then eliminate it, so the high complexity and the need for some special resources (such as antennas) are its main disadvantages

Method used

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  • Method for randomizing neighborhood cell interference in OFDM system
  • Method for randomizing neighborhood cell interference in OFDM system
  • Method for randomizing neighborhood cell interference in OFDM system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, the starting positions of the frequency segments occupied by the RBs allocated by the base station to adjacent cells are different, so as to realize the randomization of adjacent cell interference.

[0035] As shown in Figure 2, cells 1 and 2 are adjacent cells, and each RB consists of 12 subcarriers. For cell 1, the base station allocates 3 consecutive RBs to its first user, and the frequency segment occupied by RBs The starting position of the cell is the 0th subcarrier, the base station allocates 1 RB to its second user, and the starting position of the frequency segment occupied by the RB is the 48th subcarrier; and for the second cell, the base station allocates 1 RB to its third user 2 connected RBs are allocated, and the starting position of the frequency segment occupied by the RB is the 18th subcarrier, the base station allocates 1 RB to its fourth user, and the starting position of the frequency segment occupied by the RB is the 54th subcarrier C...

Embodiment 2

[0045] Embodiment 2, the method for realizing the randomization of adjacent cell interference based on frequency hopping in the OFDM system, this method realizes the randomization of adjacent cell interference by changing the relative starting position of RB allocated by each cell, from Figure 4 It can be seen from the figure that after the RB starting position hops over time, the interval between the RB starting positions of the three cells in a cell group remains unchanged, but the interval between the RB starting positions between the cell groups is changed. The polygon represents a cell group, and each hexagon is divided into three parts, each part represents a cell in the group, and the number in each part represents the starting position of the subcarrier occupied by the RB of the cell. like Figure 4 The minimum RB start position interval in (a) occurs in the adjacent cells with cell group ID 3 and cell group ID 4, and their RB start positions are the 7th subcarrier an...

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Abstract

The invention discloses a method for randomizing adjacent area interference in an orthogonal frequency division multiplexing system., which belongs to the field of OFDM systems. The method comprises: distributing frequency resource blocks to district users according to marks of a district group which comprises districts and the marks of the districts in the group and enabling the initiating positions of the frequency resource blocks which are used by neighboring n districts to be different mutually, wherein n is the number of sub carriers in one frequency resource block. The method of the invention takes n / c district groups as a basic unit, which enables the initiating positions of RB which is used by each district in the basic unit to be different mutually, an optimization scheme of the invention also enables the initiating positions of the RB which is used by each district in each district group to be staggered to the maximum and enables the RB initiating positions of the districts which belong to different district groups to be staggered to the maximum, thereby the adjacent area interference can be randomized to the maximum, in the optimization scheme of the invention, the RB initiating positions carry out frequency hopping changes along time, thereby the anti-interference performance of the system is improved, and the method of the invention does not need to increase additional signaling overhead simultaneously.

Description

technical field [0001] The invention belongs to the OFDM system, in particular to a method for randomizing the interference of adjacent cells in the OFDM system of Orthogonal Frequency Division Multiplexing. Background technique [0002] With the development of mobile communication systems, the data transmission rate is required to be higher and higher, so the application of parallel multi-carrier multiple access technology in mobile communication systems is imperative. Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) is a common multi-carrier modulation technology, which is suitable for high-speed data transmission on broadband channels with severe frequency selective fading caused by multipath transmission. , and can use Fast Fourier Transform (FFT: Fast FourierTransform) to realize the modulation and demodulation of the baseband signal, thus having the advantages of low cost of the transceiver. In the future broadband wireless...

Claims

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Application Information

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IPC IPC(8): H04B7/02H04J11/00H04L27/26
Inventor 夏树强杨扬梁春丽郁光辉
Owner ZTE CORP
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