﻿ 无线通信系统公共信道干扰储备的非线性拟合估计 Nonlinear Fitting Estimation of Common Channel Interference Reserve in Wireless Communication System

Hans Journal of Wireless Communications
Vol.07 No.02(2017), Article ID:20456,11 pages
10.12677/HJWC.2017.72010

Nonlinear Fitting Estimation of Common Channel Interference Reserve in Wireless Communication System

Jie Shen, Geng Zhang, Yang Wang

China Electrical Power Research Institute, Beijing

Received: Apr. 12th, 2017; accepted: Apr. 27th, 2017; published: Apr. 30th, 2017

ABSTRACT

In this paper we provide a solution to problem existing in link budget of common channel in wireless communication system, adopting curve fitting to calculate equivalent path-loss first, then get cell interference margin; last the real path-loss is obtained. During the procedure, we also select different scene to simulate interference cancellation factor and Interference Ratio between adjacent cell and local cell throug h w eight method. At the end, we get the map of cell edge coverage and area coverage, as reference for wireless network planning and optimization.

Keywords:Wireless Communication System, BCH, FACH, Common Channel, Link-Budget, Curve-Fitting, Edge-Coverage, Area-Coverage

1. 引言

2. 新的公共信道链路预算方法

2.1. 干扰储备的计算

(1)

(2)

(3)

(为路径损耗)

(4)

(5)

2.2. 进一步的考虑

1) 加入邻区与本区的干扰抑制因子

(6)

2) 加入SCPPCH与FPACH的激活因子(存在的概率)

(7)

2.3. 拟合算法

2.3.1. 两种拟和方法

(8)

(9)

(10)

Figure 1. The principle of Quasi - Algorithms

(11)

(12)

(13)

(14)

(10’)

(11’)

(12’)

(13’)

2.3.2. 最小二乘法估计

(这里为参量)

2.3.3. 带权重的最小二乘法

3. 公共信道链路预算流程

4. 拟和实例

4.1. 链路仿真提取β值

4.2. 拟合实例

1) 干扰最高项为一次项

Figure 2. Common channel link budget flow chart

Figure 3. BCH error rate and demodulation threshold

4.3. 曲线拟合的精度分析

4.4. 系统仿真提取i因子

i因子用于评估邻区干扰与本小区干扰之比。最新结果对小区边缘进行仿真。

1) 参加检测的邻区干扰总功率/本小区信号总功率(信号 + 干扰)得到

2) 参加检测的邻区干扰总功率/本小区信号总功率(信号 + 干扰)得到

4.5. 应用b因子i因子进行链路预算

(这里λ按照2码片折算，为−2 dB)。

5. 5M组网下BCH仿真结果

8天线最大发射功率：33 dBm

(15)

BCH边缘覆盖率和小区半径的关系，如图4所示。

6. 阴影储备值的计算

1) 得到小区半径和边缘覆盖率之间的关系；以及小区半径和区域覆盖率之间的关系。

2) 得到边缘覆盖率和区域覆盖率之间的映射关系。

1) 边缘覆盖效率

(16)

2) 面积覆盖效率

Figure 4. BCH edge coverage and cell radius

Figure 5. The relationship of edge coverage and cell radius for BCH-density urban area (calculation values and simulation values)

Figure 6. The relationship between urban edge coverage and base station spacing

Figure 7. Theoretical results on the relationship between edge coverage and area coverage

7. 结论

Nonlinear Fitting Estimation of Common Channel Interference Reserve in Wireless Communication System[J]. 无线通信, 2017, 07(02): 78-88. http://dx.doi.org/10.12677/HJWC.2017.72010

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