公开(公告)号：EP0851575A3

公开(公告)日：1998-12-16

申请号：EP97310546.3

申请日：1997-12-23

申请人： BRITISH BROADCASTING CORPORATION

发明人： Moss, Peter Neil, c/o British Broadcasting Corp.

IPC分类号： H03F1/32

CPC分类号： H03F1/3241

摘要： A radio-frequency amplifier circuit comprises a radio-frequency amplifier (10) having a linearisation circuit (14) to substantially linearise the amplifier over a linear operating range. A pre-processing circuit (20) has its output coupled to the input of the radio-frequency amplifier and is operative to clip the magnitude of the input signal to a predetermined value at the top of the linear operating range of the radio-frequency amplifier. This reduces the phase distortion which takes place when the input signal crosses over into the non-linear region above the linear operating range of the RF amplifier.

摘要翻译： 射频放大器电路包括具有线性化电路（14）的射频放大器（10），以在线性工作范围内使放大器基本线性化。 预处理电路（20）的输出端耦合到射频放大器的输入端，并且可操作地将输入信号的幅度限制在射频放大器的线性工作范围的顶部的预定值 。 这降低了当输入信号跨越到RF放大器的线性工作范围之上的非线性区域时发生的相位失真。

公开(公告)号：EP1098484A2

公开(公告)日：2001-05-09

申请号：EP00309679.9

申请日：2000-11-02

申请人： BRITISH BROADCASTING CORPORATION

发明人： Moss, Peter Neil, c/o British Broadcasting Corp.

IPC分类号： H04L27/26 ,  H04H1/00

CPC分类号： H04L27/2647

摘要： A digital audio broadcasting (DAB) receiver designed for receiving a signal with 1536 active carriers generated by an inverse fast Fourier transform (FFT) with 2048 points, includes the usual RF stage (14), an IF filter (20), and a demodulator (52) providing a real signal at a low IF. This is followed by an anti-aliasing filter (58), a sampler (60), and an FFT (62). The FFT is a 8192-point FFT, which substantially simplifies the construction of the IF filter (20) and, more particularly, the anti-aliasing filter (58).

摘要翻译： 数字音频广播（DAB）接收机包括通常的RF级（14），IF滤波器（20）和用于通过具有2048个点的快速傅里叶逆变换（FFT）生成的具有1536个有源载波的信号， 解调器（52），以低IF提供实际信号。 之后是抗混叠滤波器（58），采样器（60）和FFT（62）。 FFT是8192点FFT，其大大简化了IF滤波器（20）的构造，更具体地，简化了抗混叠滤波器（58）。

公开(公告)号：EP0851575B1

公开(公告)日：2004-02-25

申请号：EP97310546.3

申请日：1997-12-23

申请人： BRITISH BROADCASTING CORPORATION

发明人： Moss, Peter Neil, c/o British Broadcasting Corp.

IPC分类号： H03F1/32

CPC分类号： H03F1/3241

公开(公告)号：EP1175056A1

公开(公告)日：2002-01-23

申请号：EP01303991.2

申请日：2001-05-01

申请人： BRITISH BROADCASTING CORPORATION

发明人： Moss, Peter Neil, c/o British Broadcasting Corp.

IPC分类号： H04L27/26

CPC分类号： H04L27/2657 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2675

摘要： An OFDM signal having a large plurality of data-bearing carriers (80;84) spaced by a predetermined spacing includes a plurality of pilot carriers (82;86). Each pilot carrier is spaced from the nearest data-bearing carrier and the other pilot carriers by not less than a multiple of the predetermined spacing, the multiple being at least two. A receiver for the OFDM signal includes a receiver and demodulator section (12-30) for receiving and demodulating the OFDM signal to provide a plurality of data carriers and a plurality of pilot carriers; a phase detecting section (40) for detecting phase error in the pilot carriers; a phase compensating circuit (38) for phase compensating the data carriers in dependence upon pilot carrier phase; and a main Fourier transform circuit (32) connected to the output of the phase compensating circuit. The phase compensating circuit includes a second Fourier transform circuit which provides a number of points which is a sub-multiple of the number of points provided by the main Fourier transform circuit, this sub-multiple being at least two.

摘要翻译： 具有间隔有预定间隔的大量数据承载载体（80; 84）的OFDM信号包括多个导频载波（82; 86）。 每个导频载波与最近的数据承载载波和其他导频载波间隔不少于预定间隔的倍数，该多个是至少两个。 用于OFDM信号的接收机包括用于接收和解调OFDM信号以提供多个数据载体和多个导频载波的接收机和解调器部分（12-30） 相位检测部（40），用于检测导频载波中的相位误差; 相位补偿电路（38），用于根据导频载波相位相位补偿数据载波; 以及连接到相位补偿电路的输出的主傅里叶变换电路（32）。 相位补偿电路包括第二傅立叶变换电路，其提供作为由主傅立叶变换电路提供的点数的子倍数的多个点，该子倍数为至少两个。

公开(公告)号：EP1724946B1

公开(公告)日：2009-07-22

申请号：EP06252591.0

申请日：2006-05-18

申请人： British Broadcasting Corporation

发明人： Moss, Peter Neil, c/o British Broadcasting Corp.

IPC分类号： H04B7/155

CPC分类号： H04L25/24 ,  H04B1/525 ,  H04B7/15585 ,  H04L27/2601

公开(公告)号：EP0851575A2

公开(公告)日：1998-07-01

申请号：EP97310546.3

申请日：1997-12-23

申请人： BRITISH BROADCASTING CORPORATION

发明人： Moss, Peter Neil, c/o British Broadcasting Corp.

IPC分类号： H03F1/32

CPC分类号： H03F1/3241

摘要： A radio-frequency amplifier circuit comprises a radio-frequency amplifier (10) having a linearisation circuit (14) to substantially linearise the amplifier over a linear operating range. A pre-processing circuit (20) has its output coupled to the input of the radio-frequency amplifier and is operative to clip the magnitude of the input signal to a predetermined value at the top of the linear operating range of the radio-frequency amplifier. This reduces the phase distortion which takes place when the input signal crosses over into the non-linear region above the linear operating range of the RF amplifier.

摘要翻译： 射频放大器电路包括具有线性化电路（14）的射频放大器（10），以在线性工作范围上使放大器基本线性化。 预处理电路（20）的输出耦合到射频放大器的输入，并且可操作地将输入信号的幅度剪切到在射频放大器的线性工作范围的顶部的预定值 。 这降低了当输入信号跨越到RF放大器的线性工作范围之上的非线性区域时发生的相位失真。