公开(公告)号：US20050068979A1

公开(公告)日：2005-03-31

申请号：US10672657

申请日：2003-09-26

Applicant: Jan Boer ,  Wilhelmus Diepstraten ,  Robert Kopmeiners ,  Kai Kriedte

Inventor： Jan Boer ,  Wilhelmus Diepstraten ,  Robert Kopmeiners ,  Kai Kriedte

IPC: H04L12/28 ,  H04B7/26 ,  H04L12/413 ,  H04L12/56 ,  H04L27/00 ,  H04L27/26

CPC classification number: H04L27/0012 ,  H04L27/2647 ,  H04W74/0825

Abstract: A method and apparatus are disclosed for detecting a collision in a carrier sense multiple access wireless communication system. Each transmitting station includes a collision detector that evaluates one or more predefined criteria to determine when a collision has occurred. The collision detector evaluates the measured energy level and optionally payload and/or preamble detection information to determine if a collision has occurred. A collision occurred when an expected ACK message is not received, in the presence of an increased energy level and possibly preamble or payload detection information. The collision detector of the present invention can be activated, for example, at a time corresponding to the start of the 802.11 Short Inter Frame Space interval.

Abstract translation: 公开了用于检测载波侦听多址无线通信系统中的冲突的方法和装置。 每个发射站包括一个碰撞检测器，该碰撞检测器评估一个或多个预定标准以确定碰撞发生的时间。 碰撞检测器评估所测量的能级，以及可选的有效载荷和/或前导码检测信息，以确定是否发生了冲突。 在存在增加的能级和可能的前导码或有效载荷检测信息的情况下，当未接收到期望的ACK消息时发生冲突。 本发明的碰撞检测器例如可以在对应于802.11短帧间隔间隔的开始的时间被激活。

公开(公告)号：US20050013391A1

公开(公告)日：2005-01-20

申请号：US10621862

申请日：2003-07-17

Applicant: Jan Boer ,  Bas Driesen ,  Ra'anan Gil ,  Kai Kriedte

Inventor： Jan Boer ,  Bas Driesen ,  Ra'anan Gil ,  Kai Kriedte

IPC: H04J11/00 ,  H04B17/00 ,  H04L1/20 ,  H04L27/06

CPC classification number: H04L1/208 ,  H04L1/20

Abstract: In a wireless system including a wireless communication channel, a method for estimating a signal quality of a received signal includes the steps of receiving a signal from the wireless communication channel, the received signal including at least one field that is modulated and encoded in a substantially fixed manner, and generating at least one reference field based, at least in part, on the at least one field and on a channel estimation signal. The channel estimation signal is representative of at least one characteristic of the wireless communication channel. The method further includes the step of generating a signal quality estimate as a function of the at least one field in the received signal and the generated at least one reference field.

Abstract translation: 在包括无线通信信道的无线系统中，用于估计接收信号的信号质量的方法包括以下步骤：从无线通信信道接收信号，所接收的信号包括被实质上被调制和编码的至少一个场 至少部分地基于所述至少一个场和信道估计信号生成至少一个参考场。 信道估计信号表示无线通信信道的至少一个特性。 该方法还包括以下步骤：根据所接收的信号和所生成的至少一个参考场产生作为至少一个场的函数的信号质量估计。

公开(公告)号：US20060002487A1

公开(公告)日：2006-01-05

申请号：US10990344

申请日：2004-11-16

Applicant: Kai Kriedte ,  Syed Mujtaba ,  Xiaowen Wang

Inventor： Kai Kriedte ,  Syed Mujtaba ,  Xiaowen Wang

IPC: H04L1/02

CPC classification number: H04L27/2613 ,  H04B7/0684 ,  H04L1/0046 ,  H04L1/0061

Abstract: Methods and apparatus are disclosed for processing received data in a multiple input multiple output (MIMO) communication system. A multiple antenna receiver can distinguish a MIMO transmission from other transmissions based on the detection of a predefined symbol following a legacy portion of a preamble. A preamble comprises a legacy portion and an extended portion. The legacy portion is comprised of a first long preamble followed by a first signal field and may be processed by both multiple antenna receivers and legacy receivers. The extended portion comprises the predefined symbol following the first signal field from the legacy portion. If the predefined symbol is a second long preamble, a MIMO transmission is detected by performing a correlation on the preamble to detect the second long preamble. If the predefined symbol is a second long signal field, a MIMO transmission is detected by performing a cyclic redundancy check to detect the second long signal field.

Abstract translation: 公开了用于在多输入多输出（MIMO）通信系统中处理接收数据的方法和装置。 多天线接收机可以基于在前导码的遗留部分之后的预定符号的检测来区分MIMO传输与其他传输。 前导码包括遗留部分和扩展部分。 遗留部分由第一长前导跟随第一信号场组成，并且可以由多个天线接收机和传统接收机两者来处理。 扩展部分包括来自遗留部分的第一信号字段之后的预定符号。 如果预定义符号是第二长前导码，则通过对前导码执行相关性来检测MIMO传输以检测第二长前导码。 如果预定符号是第二长信号字段，则通过执行循环冗余校验来检测第二长信号字段来检测MIMO传输。