Tradeoff between Area Spectral Efficiency and End-to-End Throughput in Rate-Adaptive Multihop Radio Networks

We investigate the impact of symbol rate control, modulation level control, and the number of hops on the area spectral efficiency of interference-limited multihop radio networks. By controlling symbol rate and modulation level, data rate can be adapted according to received power. In addition, varying the number of hops can control received power. First., we evaluate the achievable end-to-end throughput of multihop transmission assuming symbol rate and modulation level control. Numerical results reveal that by controlling symbol rate or using multihop transmission, the end-to-end communication range can be extended at the cost of end-to-end throughput, and this may result in lower area spectral efficiency. Next, an expression for the area spectral efficiency of multihop radio networks is derived as a function of the number of hops and the end-to-end throughput. Numerical results also reveal that the resulting area spectral efficiency depends on the specific circumstances, which, however, can be increased only by using multihop transmission.

我们研究了符号率控制、调制级别控制以及跳数对受干扰限制的多跳无线网络的区域频谱效率的影响。通过控制符号率和调制级别，数据速率可根据接收功率进行调整。此外，改变跳数能够控制接收功率。首先，我们在假设符号率和调制级别可控的情况下评估多跳传输可实现的端到端吞吐量。数值结果表明，通过控制符号率或采用多跳传输，端到端通信范围能够以端到端吞吐量为代价得以扩展，这可能会导致区域频谱效率降低。接下来，推导出了多跳无线网络的区域频谱效率表达式，它是跳数和端到端吞吐量的函数。数值结果还表明，所得到的区域频谱效率取决于具体情况，然而，只有通过使用多跳传输才能提高区域频谱效率。