Performance Analysis of Rateless Codes in an ALOHA Wireless Ad Hoc Network
Performance Analysis of Rateless Codes in an ALOHA Wireless Ad Hoc Network
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DOI：
10.1109/twc.2015.2450716
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发表时间：
2015-06
影响因子：
10.4
通讯作者：
Amogh Rajanna;I. Bergel;M. Kaveh
中科院分区：
文献类型：
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作者：
Amogh Rajanna;I. Bergel;M. Kaveh
在本文中，我们研究了无线自组织网络（WANET）中的无比率纠错码的性能。WANET的显著特征是瑞利衰落，恒定功率传输，纯ALOHA作为信道接入协议，并且节点由均匀时空泊松点过程建模。对于这样的WANET，本文量化的速率密度（RD）和分组传输时间的动态变化，推导出上界的分组传输时间的CCDF。将无比率码的性能与两个基准进行比较，即，遍历RD（ERD）和固定速率码的RD。所提出的无比率编码方案不需要时间分集，因为每个分组在单个相干时间内发送。然而，它表明，RD可以高达76%和50%的ERD在噪声和干扰限制制度，分别。因此，所提出的网络几乎实现了ERD，同时需要显着更短的延迟。本文证明了采用最近邻译码器的低复杂度高斯接收机几乎具有理想匹配接收机的性能。我们还表明，在信道阈值的形式的功率控制导致一个72%的增益在RD相对于一个恒定的功率传输。
In this paper, we study the performance of rateless error correction codes in a wireless ad hoc network (WANET). The salient features of a WANET are Rayleigh fading, constant power transmission, pure ALOHA as the channel access protocol, and the nodes being modeled by a homogeneous space-time Poisson point process. For such a WANET, this paper quantifies the rate density (RD) and the dynamic variations of the packet transmission time by deriving an upper bound on the CCDF of the packet transmission time. The performance of rateless codes is compared with two benchmarks, i.e., the ergodic RD (ERD) and the RD of fixed-rate codes. The proposed rateless coding scheme does not require time diversity as each packet is transmitted within a single coherence time. Yet, it is shown that the RD can be up to 76% and 50% of the ERD in noise- and interference-limited regimes, respectively. Thus, the presented network nearly achieves the ERD while requiring significantly shorter delays. This paper shows that a low-complexity Gaussian receiver with a nearest neighbor decoder has almost the performance of an ideal matched receiver. We also show that power control in the form of channel thresholding leads to a 72% gain in the RD relative to a constant power transmission.