无线体域网低复杂度重复码解扩频方法研究

doi:10.11959/j.issn.1000-436x.2015207

Abstract

Abstract:

To improve the reliability of data transmission and reduce the complexity of the narrow band receiver for wireless body area networks(WBAN),spreading with repetition code is used in IEEE 802.15.6 standard.A despreading structure in which the metrics of reliability were calculated selectively according to the dynamic threshold was designed.Combined with hard decision,hard threshold-combine and hard threshold-delete despreading methods by simplifying maximal ratio combining and generalized minimum distance principle respectively were proposed,which had low complexity and near-optimal performance.The theoretical analysis and simulation results show that compared to despreading based on maximum likelihood method,the spreading gain of the proposed methods is close to the theoretical value and the computational complexity can be reduced by 86% at most under high SNR circumstances.

Key words: despreading, repetition code, soft-decision, low-complexity, wireless body area networks

Yu CHI,Lan CHEN,Chao LV. Low-complexity despreading scheme with repetition code for wireless body area networks[J]. Journal on Communications, 2015, 36(8): 146-152.

Figures/Tables 14

模块	运算量	单位	运算类型
解调硬判决	N	O(1)	比较
解扰	N	O(1)	异或
解交织及硬判决解扩频	$\frac{N (F - 1)}{F}$	O(1)	比较
总计	$3 N - \frac{N}{F}$	O(1)

模块	运算量	单位	运算类型
解扰	$N + \frac{2 k N}{2}$	O(1)	比较+取相反数运算
解交织及量度合并	$\frac{N (F - 1)}{F}$	O(k)	k bit加法
解扩频硬判决	$\frac{N}{F}$	O(1)	比较
总计	$3 k N + \frac{2 N (1 - k)}{F}$	O(1)

模块	运算量	单位	运算类型
硬判决分支解调	N	O(1)	比较
硬判决分支解扰	N	O(1)	异或
硬判决分支解扩频	N	O(1)	比较
软判决分支解扰	$F T + \frac{2 k F T}{2}$	O(1)	比较+取相反数运算
软判决分支量度合并	T(F?1)	O(k)	k bit加法
软判决分支解扩频	T	O(1)	比较
总计	3N+3kFT+2T(1?k)	O(1)

模块	运算量	单位	运算类型
硬判决分支解调	N	O(1)	比较
硬判决分支解扰	N	O(1)	异或
硬判决分支解扩频	N	O(1)	比较
软判决分支解扰	$F T + \frac{2 k F T}{2}$	O(1)	比较+取相反数运算
删除x个符号	$\frac{F T}{4 k} + \frac{k}{2 \sum_{l = 1}^{T} \sum_{i = 1}^{x} (F - i)}$	O(1)	取绝对值+比较
软判决分支解扩频	$\sum_{l = 1}^{T} (F - x)$	O(1)	比较
总计	$3 N + (2 k + 1) F T + \frac{k}{2 \sum_{l = 1}^{T} \sum_{i = 1}^{x} (F - i) + \sum_{l = 1}^{T} (F - x)}$	O(1)

各模块	仿真参数
调制方式	$\frac{π}{２} - DBPSK$
解调方式	差分解调
负载长度	255 byte
信道环境	高斯白噪声
交织函数	$b (i) = a [F \cdot r e m (i, 2) + ⌊ \frac{i}{2} ⌋] i = 0, 1, \dots, 2 F - 1$
加扰多项式	G(x)=1+x²+x¹²+x¹³+x¹⁴

References 27

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Low-complexity despreading scheme with repetition code for wireless body area networks

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