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71. 发明授权

US06876675B1 Synchronization in OFDM systems 有权
标题翻译： OFDM系统中的同步
公开(公告)号：US06876675B1
公开(公告)日：2005-04-05
申请号：US09245168
申请日：1999-02-05
申请人： Vincent K. Jones , Michael Pollack , Gregory G. Raleigh
发明人： Vincent K. Jones , Michael Pollack , Gregory G. Raleigh
IPC分类号： H04J3/06 , H04J11/00 , H04L27/26
CPC分类号： H04L27/2662 , H04L27/2659 , H04L27/266 , H04L27/2666 , H04L27/2675 , H04L27/2678
摘要： Highly effective systems and methods for synchronizing OFDM receiver parameters to an OFDM transmitter are provided. These parameters may include carrier frequency, burst timing, and cyclic prefix length. These systems and methods incorporate special structural features into the OFDM signal to facilitate synchronization. In one embodiment, a supplemental cyclic prefix is added to an OFDM signal to facilitate synchronization. In an alternative embodiment, a synchronization burst with a periodic structure is used to facilitate synchronization. According to the present invention, synchronization may be maintained even if low cost analog oscillator components are used.
摘要翻译：提供了用于将OFDM接收机参数同步到OFDM发射机的高效系统和方法。这些参数可以包括载波频率，突发定时和循环前缀长度。这些系统和方法将特殊的结构特征融入到OFDM信号中以促进同步。在一个实施例中，补充循环前缀被添加到OFDM信号以便于同步。在替代实施例中，使用具有周期性结构的同步突发以促进同步。根据本发明，即使使用低成本的模拟振荡器组件，也可以保持同步。

72. 发明授权

US06463096B1 MAC protocol employing multiple data rates 失效
标题翻译： MAC协议采用多种数据速率
公开(公告)号：US06463096B1
公开(公告)日：2002-10-08
申请号：US09097305
申请日：1998-06-12
申请人： Gregory G. Raleigh , Vincent K. Jones , Michael A. Pollack
发明人： Gregory G. Raleigh , Vincent K. Jones , Michael A. Pollack
IPC分类号： H04B1700
CPC分类号： H04L12/2898 , H04J4/00 , H04L1/0002 , H04L1/0025 , H04L12/2856 , H04L47/15 , H04L47/70 , H04L47/788 , H04L47/801 , H04L47/805 , H04L47/824 , H04W28/22 , H04W28/26 , H04W72/042 , H04W72/0446 , H04W72/0453 , H04W74/00
摘要： Method and apparatus for combining high data rate traffic and low data rate traffic on a common transmission medium while maximizing efficient use of available spectrum. Since spectrum is an economically valuable resource and transport of data generates revenue, the present invention directly leads to more profitable network operation. The disclosed systems are applicable to both wired and wireless transmission media. In one embodiment, a bandwidth reservation scheme provides that data rate may be varied so that when a particular data communication device is allocated a frame, it is also assigned a data rate for use in that frame. Because bandwidth usage varies with data rate, the division of available spectrum into channels for use by individual data communication devices may also vary among frames.
摘要翻译：用于在普通传输介质上组合高数据速率业务和低数据速率业务同时最大限度地利用可用频谱的方法和装置。由于频谱是一种经济上有价值的资源，数据的传输产生收益，本发明直接导致更有利可图的网络运行。所公开的系统适用于有线和无线传输介质。在一个实施例中，带宽预留方案提供数据速率可以被改变，使得当特定的数据通信设备被分配一个帧时，它也被分配用于该帧的数据速率。由于带宽使用随数据速率而变化，所以将可用频谱划分成各个数据通信设备使用的信道也可能在帧之间变化。

73. 发明授权

US06192026B1 Medium access control protocol for OFDM wireless networks 失效
标题翻译：用于OFDM无线网络的媒体接入控制协议
公开(公告)号：US06192026B1
公开(公告)日：2001-02-20
申请号：US09019938
申请日：1998-02-06
申请人： Michael A. Pollack , Vincent K. Jones , Gregory G. Raleigh
发明人： Michael A. Pollack , Vincent K. Jones , Gregory G. Raleigh
IPC分类号： H04J1100
CPC分类号： H04L5/023
摘要： A medium access contention protocol that is highly beneficial in wireless networks and particularly in wireless networks that employ a fixed minimum burst size such as OFDM wireless networks. In one embodiment, a MAC protocol is a demand-assigned protocol that maximizes utilization of the bus medium (the allocated frequency spectrum.) Each data communication device (DCD) in the network communicates with a central access point (AP). Multiple DCDs may request access from the AP in the same request access (RA) burst. Each of the multiple DCDs transmits its access request to the AP within a frequency domain channel in the RA burst that is orthogonal to the frequency domain channels used by the other DCDs requesting access. Each DCD includes channel training information in the access request burst to allow the AP and/or DCD to adapt to rapid variations in channel characteristics.
摘要翻译：一种媒体接入争用协议，其在无线网络中，特别是在使用诸如OFDM无线网络的固定的最小突发大小的无线网络中是非常有益的。在一个实施例中，MAC协议是使总线介质（所分配的频谱）的利用最大化的需求分配协议。网络中的每个数据通信设备（DCD）与中央接入点（AP）通信。多个DCD可以在相同的请求访问（RA）突发中请求来自AP的访问。多个DCD中的每一个在RA突发中的频域信道内向AP发送其接入请求，该RA突发与正在其他DCD请求接入的频域信道正交。每个DCD包括访问请求突发中的信道训练信息，以允许AP和/或DCD适应信道特性的快速变化。

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