公告搜索
Location Aided Wireless System (定位辅助无线系统)
项目编号: 状态:已结束 联系方式:
发布时间:2013/5/6来源:本站 我要咨询 T:
分享:

项目名称:Location Aided Wireless System (定位辅助无线系统)
编号:03-202
类别: Communication/ Wireless

项目描述:
Stanford researchers have developed techniques for location-assisted wireless communications which uses real-time locations of wireless transceivers together with stored location-indexed channel information to improve communication over a wireless channel between the transceivers. These techniques improve the capacity and/or performance of wireless communication systems such as cellular systems.
This method can be used for different modulation techniques, including DS-SS, OFDM and single carrier. It can be used in conjunction with a variety of multiple access schemes such as CDMA, TDMA and PRMA. It is also useful in multiple antenna-based transceivers. It is independent of the method used to locate the mobile and can leverage such methods that are already being deployed in modern cellular systems. In addition, it does not require extra bandwidth or power resources to operate.
适用:
  • Any cellular communication system (e.g. cdmaOne, cdma2000, WCDMA, GSM, IEEE802.16) using a geolocation technology (e.g those used for E-911)
  • Any other wireless communication system using geolocation
优势:
  • Increases cell capacity: Capacity increases 100% due to better path identification, 70% due to better tracking and 15% due to better beamforming, under standard channel conditions.
  • Increases cell coverage: Accurately identifies and combines all paths even under low SNR.
  • Reduces call drops: The link is less susceptible to the fading of any single path as it combines energy from all available paths, reducing the probability of a call getting dropped.
  • Improves voice quality and data applications: Reduces bit-error-rate and potentially increases data rate, making quality better and data applications faster.
  • Improves receiver or transmitter performance and complexity: By providing the proper channel parameters, the method improves transmitter and receiver performance while reducing complexity.
  • Improves calls in moving vehicles: Multipaths appear and disappear very fast for moving vehicles, leading to a severe loss in call quality and high call drop probability. On the other hand, open sky view (to GPS satellites) and predictable movement along roads enhances location-aided channel estimation, thus eliminating most network problems.
  • Improves data applications: Data applications require low error rate (hence good channel estimates). Yet, receivers typically do not have good channel state information due to burstiness of such applications. If the mobile location is transmitted prior to the actual data, all the multipath parameters can be properly acquired using the database -leading to better link performance.
权利状况: Issued: 7,333,774 (USA)
项目联系方式:0755-86674700, 电子邮箱:ss@sotcbb.com

  • 我要咨询
  • 收藏
  • 打印
  • 分享:
用户登录
邮件地址/手机号
密码
验证码