NeTS-WN: COGNET: Cognitive Radio Networks based on OFDM

NeTS-WN：COGNET：基于 OFDM 的认知无线电网络

• 批准号: 0721580
• 负责人: Ian Akyildiz
• 金额: $ 60万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0721580&HistoricalAwards=false
• 关键词: NeTS; WN; COGNET; Cognitive; Radio

Cognitive radio networks enable the sharing of the wireless spectrum with licensed users, but impose challenges due to the fluctuating nature of the spectrum as well as the diverse quality-of-service (QoS) requirements. To address these challenges, a spectrum-aware COGnitive radio NETwork (COGNET) based on orthogonal frequency division multiplexing (OFDM) is proposed.In COGNET, five major research directions are investigated: (1) First, a frequency agile, wideband analog/RF front-end technology is developed, which is robust to non-linearity (RF/analog IC design). (2) To detect the presence of licensed users, a fast detection scheme is developed by exploiting the spatial diversity inherent to multi-user networks (spectrum sensing), (3) To select the best channel, novel decision methods are proposed that consider channel information, licensed user activities, and application requirements (spectrum decision). (4) A dual-mode spectrum sharing framework is proposed, which enables access to existing networks as well as coordination between cognitive radio users (spectrum sharing). (5) A spectrum mobility management framework is proposed to achieve efficient operations as cognitive users switch between the channels when a licensed user is detected (spectrum mobility). Based on these research topics, a testbed is developed to demonstrate the protocols developed on cognitive radio transceivers.Although COGNET was originally proposed for both infrastructure and ad hoc networks, due to the budget cut, research topics on ad hoc networks ("cooperative spectrum sensing for COGNET ad-hoc access" and "spectrum-adaptive route recovery for COGNET ad hoc access") will not be investigated.

认知无线电网络可以与授权用户共享无线频谱，但由于频谱波动的性质以及不同的服务质量 (QoS) 要求，也带来了挑战。为了应对这些挑战，提出了一种基于正交频分复用（OFDM）的频谱感知COGnitive无线电网络（COGNET）。在COGNET中，研究了五个主要研究方向：（1）首先，开发频率捷变、宽带模拟/射频前端技术，该技术对非线性具有鲁棒性（射频/模拟IC设计）。 (2) 为了检测许可用户的存在，通过利用多用户网络固有的空间分集（频谱感知）开发了一种快速检测方案。 (3) 为了选择最佳信道，提出了考虑信道信息、许可用户活动和应用要求的新颖决策方法（频谱决策）。 (4)提出了双模频谱共享框架，该框架能够接入现有网络以及认知无线电用户之间的协调（频谱共享）。 (5) 提出了频谱移动性管理框架，以实现当检测到许可用户时认知用户在信道之间切换时的高效操作（频谱移动性）。基于这些研究主题，开发了一个测试平台来演示在认知无线电收发器上开发的协议。虽然COGNET最初是针对基础设施和自组织网络提出的，但由于预算削减，自组织网络的研究主题（“COGNET自组织接入的合作频谱感知”和“COGNET自组织接入的频谱自适应路由恢复”）将不会被研究。