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1. 发明授权

US5220564A Transmission control for a wireless local area network station 失效
标题翻译：无线局域网网络的传输控制
公开(公告)号：US5220564A
公开(公告)日：1993-06-15
申请号：US633699
申请日：1990-12-24
申请人： Bruce T. Tuch , Hans van Driest
发明人： Bruce T. Tuch , Hans van Driest
IPC分类号： H04B7/005 , H04L12/28
CPC分类号： H04W52/10
摘要： In a local area network station (12) for a wireless LAN, a threshold level circuit (62) includes a register (134) which stores a threshold value. The station receiver (42) monitors the transmission channel and provides a receive level signal indicative of the signal level received. Transmission of a data frame by the station transmitter (46) is permitted or deferred according as the receive level signal value is below or above the threshold level, regardless of whether or not the received signal derives from a transmission by a station in the receiving station's own LAN. The threshold is dynamically updated whenever the station (12) receives a data frame from its own LAN. An improved utilization of the wireless transmission channel is achieved.

2. 发明授权

US4998261A Spread spectrum signal demodulator 失效
标题翻译：扩频信号解调器
公开(公告)号：US4998261A
公开(公告)日：1991-03-05
申请号：US450891
申请日：1989-12-14
申请人： Hans van Driest , Jacobus C. Haartsen , Bruce T. Tuch , Maarten Visee
发明人： Hans van Driest , Jacobus C. Haartsen , Bruce T. Tuch , Maarten Visee
IPC分类号： H04B1/707
CPC分类号： H04B1/7093 , H04B1/70712
摘要： In a digital data receiver (80) for demodulating a direct sequence spread spectrum differential phase shift keyed data signal, the signal is applied to the input transducer (140) of a SAW device (100) which has first and second output transducers (142, 144) spaced apart on the SAW substrate (130) so as to produce first and second output signals on output lines (102, 104), which are relatively delayed by a time corresponding to a symbol period. The output transducers are of identical construction and are matched to the spread spectrum code utilized in the data signal. Thus, a single SAW device (100) effects both correlation and delay. The output signals on the output lines (102, 104) are processed by a circuit including multipliers (106, 110) and a phase shifter (108) to produce output data signals representing the received data.

3. 发明授权

US5390165A Method and apparatus for transmitting digital data packets on a wireless channel 失效
标题翻译：用于在无线信道上发送数字数据分组的方法和装置
公开(公告)号：US5390165A
公开(公告)日：1995-02-14
申请号：US986633
申请日：1992-12-04
申请人： Bruce T. Tuch
发明人： Bruce T. Tuch
IPC分类号： H04B7/26 , H04L12/28 , H04B7/00 , H04J3/14
CPC分类号： H04W52/286
摘要： In a method and apparatus for transmitting digital data packets from a station (12,14) in a wireless communication system, successive time intervals (T) are established and a packet is transmitted only if the transmission thereof does not cause a predetermined average power value (P.sub.o) to be exceeded for the current time interval. For each packet an appropriate power value is ascertained from a data base (62), in dependence on the particular destination station to which the packet is to be transmitted. For each time interval (T) a maximum energy value (I.sub.o) is decremented in accordance with the energy utilized for transmitting each packet, and a packet is transmitted only if there is sufficient energy remaining to transmit the packet during the current time interval (T).
摘要翻译：在用于从无线通信系统中的站（12,14）发送数字数据分组的方法和装置中，建立连续的时间间隔（T），并且仅当传输的数据不会导致预定的平均功率值（Po）超过当前时间间隔。对于每个分组，根据要发送分组的特定目的站，从数据库（62）确定适当的功率值。对于每个时间间隔（T），根据用于发送每个分组的能量来减小最大能量值（Io），并且仅当在当前时间间隔（T）期间剩余足够的能量来发送分组时才发送分组）。

4. 发明授权

US5040175A Wireless information transmission system 失效
标题翻译：无线信息传输系统
公开(公告)号：US5040175A
公开(公告)日：1991-08-13
申请号：US507558
申请日：1990-04-11
申请人： Bruce T. Tuch , Michael A. Masleid
发明人： Bruce T. Tuch , Michael A. Masleid
IPC分类号： H04L1/14 , H04L12/28 , H04L12/413
CPC分类号： H04W24/00 , H04L1/14 , H04L12/413 , H04W48/08 , H04W84/12
摘要： A wireless local area network (10) includes a plurality of stations (12) adapted to transmit and receive message packets via a distribution system (30). In a time division multiplexing embodiment the network (10) operates using successive timing frames (FR1, FR2, etc.) each consisting of three timing intervals (T1, T2, T3). During the first timing interval (T1) the distribution system (30) normally transmits synchronizing packets (HBT), to which a station (12) desiring to transmit responds by transmitting an information packet during the next second timing interval (T2). During the subsequent first timing interval (T1), the distribution system (30) retransmits the received information packet. Any transmitting station (12) which detects an information packet mismatch transmits a collision reporting code (CDT) during the next third timing interval (T3) to which the distribution system (30) responds by transmitting a collision acknowledgement code (CAKT) to all the stations (12) thereby aborting information transmission. A frequency division multiplexing embodiment is also disclosed.

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