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Adaptation of multiple access parameters in time hopping UWB cluster based wireless sensor networks

机译：跳时基于UWB集群的无线传感器网络中多个接入参数的自适应

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摘要

Ultrawideband (UWB) is an attractive physical layer technology for wireless sensor networks due to its unique characteristics. Flexibility in adjusting the processing gain of UWB systems makes it possible to tune the data rate and transmission range to fulfill the requirements of specific applications. Conventional systems assign identical multiple access parameters to all users regardless of the signal-to-interference plus noise ratio of the received signal. An adaptive assignment scheme for multiple access parameters in cluster based wireless sensor networks is investigated. First, an orthogonal time hopping sequence construction is proposed for synchronous communications (downlink), where the number of pulses per symbol are adjusted to meet the bit error rate requirement of an application. Then, adaptation of multiple access parameters in asynchronous scenarios (uplink) is evaluated using a Gaussian approximation method to model the multiple access interference in two cases: one with fixed frame duration, where the goal is to increase the average throughput, and the other with fixed symbol duration, where the goal is to increase the network lifetime. Finally, a mathematical framework is developed for approximating the interference when the number of pulses per symbol and the frame duration vary.
机译：由于其独特的特性，超宽带（UWB）是一种用于无线传感器网络的有吸引力的物理层技术。调整UWB系统的处理增益的灵活性使得可以调整数据速率和传输范围，以满足特定应用的要求。常规系统将相同的多路访问参数分配给所有用户，而与接收信号的信号干扰加噪声比无关。研究了基于集群的无线传感器网络中多个访问参数的自适应分配方案。首先，提出了一种用于同步通信（下行链路）的正交跳时序列构造，其中每个符号的脉冲数被调整以满足应用的误码率要求。然后，在两种情况下，使用高斯近似方法对多址干扰进行建模，从而评估异步方案（上行链路）中的多址参数的适应性：一种情况是固定帧持续时间，目的是提高平均吞吐量，另一种则是固定的符号持续时间，目标是延长网络寿命。最后，建立了一个数学框架，用于在每个符号的脉冲数和帧持续时间变化时近似干扰。

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