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1. 发明授权

US6031831A Method for reverse channel sounding in a communications system 失效
标题翻译：通信系统中反向信道探测的方法
公开(公告)号：US6031831A
公开(公告)日：2000-02-29
申请号：US602171
申请日：1996-02-15
申请人： Tiong Tan Boon , Andrew John Aftelak , Dragan Boscovic , Christopher Philip Johnson , Jonathan Alastair Gibbs , Antony John Wray
发明人： Tiong Tan Boon , Andrew John Aftelak , Dragan Boscovic , Christopher Philip Johnson , Jonathan Alastair Gibbs , Antony John Wray
IPC分类号： H04B7/005 , H04B7/04 , H04B17/00 , H04J13/00
CPC分类号： H04W52/367 , H04B7/04 , H04W52/362
摘要： A method is disclosed for determining current channel state information in a communications system having a first communications unit communicating to a second communications unit, wherein the first communications unit sends a channel sounding packet (32) to the second communications unit. The channel sounding packet (32) is sent a time period, t, prior to the transmission of a signal by the second communications unit to the first communications unit. The second communications unit receives the channel sounding packet (46) and processes the channel sounding packet to determine at least one channel characteristic. In response to receiving the channel sounding packet (46) the second communications unit appends frame code information (48) to the signal to be transmitted from the second communications unit to the first communications unit, to inform the first communications unit of the communications parameters that have been optimized.
摘要翻译：公开了一种在具有与第二通信单元通信的第一通信单元的通信系统中确定当前信道状态信息的方法，其中第一通信单元向第二通信单元发送信道探测分组（32）。在由第二通信单元将信号发送到第一通信单元之前，频道分析分组（32）被发送一个时间段t。第二通信单元接收信道探测分组（46）并处理信道探测分组以确定至少一个信道特性。响应于接收到信道探测分组（46），第二通信单元将帧代码信息（48）附加到要从第二通信单元发送到第一通信单元的信号，以通知第一通信单元的通信参数，已经优化。

2. 发明授权

US07027535B1 Frequency tracking loop and method of frequency tracking 失效
标题翻译：频率跟踪循环和频率跟踪方法
公开(公告)号：US07027535B1
公开(公告)日：2006-04-11
申请号：US09913418
申请日：2000-02-25
申请人： Andrew John Aftelak
发明人： Andrew John Aftelak
IPC分类号： H04L27/06
CPC分类号： H03J7/04 , H03L7/093 , H03L7/107
摘要： A frequency tracking loop (100) includes: a mixer (122) for correcting frequency offset of an input radio signal that includes bursts of known data; a frequency offset estimator (134), for providing an estimate of frequency offset; a variable bandwidth filter (142), for providing a filtered signal; an oscillator (146) for supplying a second input of the mixer with a signal whose frequency depends on the filtered signal; the frequency tracking loop (100) is adapted to change the bandwidth of the variable bandwidth filter (142) in dependence on at least one characteristic of the currently received burst of known data.
摘要翻译：频率跟踪环路（100）包括：混合器（122），用于校正包括已知数据的脉冲串的输入无线电信号的频率偏移; 频率偏移估计器（134），用于提供频率偏移的估计; 用于提供滤波信号的可变带宽滤波器（142）; 振荡器（146），用于向所述混频器的第二输入端提供其频率取决于滤波信号的信号; 频率跟踪环路（100）适于根据当前接收到的已知数据脉冲串的至少一个特性来改变可变带宽滤波器（142）的带宽。

3. 发明授权

US06549523B1 Background noise contrast reduction for handovers involving a change of speech codec 有权
标题翻译：用于切换语音编解码器的背景噪声对比度降低
公开(公告)号：US06549523B1
公开(公告)日：2003-04-15
申请号：US09462048
申请日：1999-12-30
申请人： Jonathan Alistair Gibbs , David Pearce , Dominic Chan , Andrew John Aftelak
发明人： Jonathan Alistair Gibbs , David Pearce , Dominic Chan , Andrew John Aftelak
IPC分类号： H04Q700
CPC分类号： G10L19/012 , H04W36/14
摘要： A method and apparatus for smooth transitions of background noise as a mobile communication unit roams from a first communication system having a first speech encoder (310) to a second communication system having a second speech encoder (330). As the mobile communication unit roams into the second communication system, the first communication system will transfer the communication signal to the second communication system. Background noise from the first communication system is sampled (320), and as the communication signal is transferred, the noise signal sampled in the first communication system is mixed in a mixer of the second communication system with background noise sampled (340) from the second communication system. As the change in noise progresses, the noise from the first communication system will gradually be decreased and faded out while the noise from the second communication system will be gradually increased to a high power level.
摘要翻译：用于随着移动通信单元的背景噪声的平滑过渡的方法和装置从具有第一语音编码器（310）的第一通信系统漫游到具有第二语音编码器（330）的第二通信系统。随着移动通信单元漫游到第二通信系统中，第一通信系统将通信信号传送到第二通信系统。来自第一通信系统的背景噪声被采样（320），并且当通信信号被传送时，在第二通信系统中采样的噪声信号被混合在第二通信系统的混合器中，从第二通信系统采样的背景噪声（340）通讯系统随着噪声变化的进行，来自第一通信系统的噪声将逐渐降低并逐渐消失，同时来自第二通信系统的噪声将逐渐增加到高功率水平。

4. 发明授权

US5987068A Method and apparatus for enhanced communication capability while maintaining standard channel modulation compatibility 失效
标题翻译：用于增强通信能力的方法和装置，同时保持标准信道调制兼容性
公开(公告)号：US5987068A
公开(公告)日：1999-11-16
申请号：US744913
申请日：1996-11-08
申请人： Simon Hugh Cassia , Andrew John Aftelak , Boon Tiong Tan , Kwan Yee Lee
发明人： Simon Hugh Cassia , Andrew John Aftelak , Boon Tiong Tan , Kwan Yee Lee
IPC分类号： H04L5/04 , H04L27/32
CPC分类号： H04L5/04
摘要： In a radio communication system (100), enhanced communication capability is provided while maintaining standard channel modulation compatibility. At a transmitter (110, 200, 600), a first information signal is generated from data according to a predefined standard modulation scheme (212, 613). A second information signal is generated from data that provides supplemental information to the standard modulated data (213, 616). For transmission, the first and second information signals are combined into a composite signal (214, 619) that represents the first information signal when interpreted according to the predefined standard modulation scheme.
摘要翻译：在无线电通信系统（100）中，提供增强的通信能力，同时保持标准信道调制兼容性。在发射机（110,200,600），根据预定义的标准调制方案（212,613）从数据生成第一信息信号。从向标准调制数据（213,616）提供补充信息的数据产生第二信息信号。为了传输，当根据预定义的标准调制方案进行解释时，第一和第二信息信号被组合成表示第一信息信号的复合信号（214,619）。

5. 发明授权

US06658075B1 Synchronization lock detector and method 失效
标题翻译：同步锁定检测器和方法
公开(公告)号：US06658075B1
公开(公告)日：2003-12-02
申请号：US09492374
申请日：2000-01-27
申请人： Andrew John Aftelak
发明人： Andrew John Aftelak
IPC分类号： H03D324
CPC分类号： H04W56/0085 , H04B7/2678 , H04L7/042 , H04L7/10 , H04L2027/0073
摘要： A frame timing lock detector circuits and a methods of frame timing lock detection for a digital communications system. A known data sequence is extracted from a received radio signal and multiplied, in a multiplier, together with a reference signal that includes the symbols of the known data sequence raised to the power of a multiple of three. The phase of the multiplier output is measured and an average of an absolute value of this measured phase is compared with a threshold to detect correct frame timing lock.
摘要翻译：帧定时锁定检测器电路和用于数字通信系统的帧定时锁定检测的方法。从接收到的无线电信号中提取已知的数据序列，并且在乘法器中与包括已知数据序列的符号的参考信号一起乘以三倍的倍数。测量乘法器输出的相位，并将该测量相位的绝对值的平均值与阈值进行比较，以检测正确的帧定时锁定。

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