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1. 发明授权

US5537435A Transceiver apparatus employing wideband FFT channelizer with output sample timing adjustment and inverse FFT combiner for multichannel communication network 失效
标题翻译：收发器采用宽带FFT通道化器，具有输出采样定时调整和反向FFT组合器，适用于多通道通信网络
公开(公告)号：US5537435A
公开(公告)日：1996-07-16
申请号：US224754
申请日：1994-04-08
申请人： Ronald Carney , Terry Williams
发明人： Ronald Carney , Terry Williams
IPC分类号： H03H17/00 , H04B1/40 , H04J1/05 , H04B1/38 , H04L5/16
CPC分类号： H04B1/0014 , H04J1/05
摘要： A physically compact, multichannel wireless communication transceiver architecture employs overlap and add or polyphase signal processing functionality, for wideband signal processing, together with a sample rate. A receiver section receives a plurality of multiple frequency communication channels and outputs digital signals representative of the contents of the plurality of multiple frequency communication channels. The receiver section contains an FFT-based channelizer that processes the digital signals output by a wideband digital receiver and couples respective channel outputs to a first plurality of digital signal processor units, which process (e.g. demodulate) respective ones of the digital channel signals and supply processed ones of the digital channel signals at respective output ports for distribution to an attendant voice/data network. On the transmit side, a transmit section contains a plurality of digital signal processors, respectively associated with respective ones of a plurality of incoming (voice/data) communication signals to be transmitted over respectively different frequency channels. Their processed (modulated, encoded) outputs are supplied to an inverse FFT combiner. The FFT combiner supplies a combined multichannel signal to a wideband transmitter which transmits a multiple frequency communication channel signal. Each of the channelizer and combiner may be implemented using overlap and add or polyphase filtering.
摘要翻译：物理紧凑的多通道无线通信收发机架构采用重叠和相位信号处理功能，用于宽带信号处理以及采样率。接收部分接收多个多频通信信道，并输出表示多个多频通信信道的内容的数字信号。接收器部分包含基于FFT的信道化器，其处理由宽带数字接收机输出的数字信号，并将相应的信道输出耦合到第一多个数字信号处理器单元，其处理（例如解调）数字信道信号中的相应数字信号并提供在各个输出端口处理数字信道信号，以便分发到话音/数据网络。在发送侧，发送部分包含多个数字信号处理器，分别与要分别在不同频率信道上发送的多个输入（语音/数据）通信信号中的相应的数字信号处理器相关联。它们的处理（调制编码）输出被提供给反FFT组合器。 FFT组合器将组合的多信道信号提供给发送多频通信信道信号的宽带发射机。可以使用重叠和添加或多相过滤来实现每个信道化器和组合器。

2. 发明授权

US5590156A Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to extend overall system dynamic range 失效
标题翻译：多通道宽带数字接收机利用具有单独选择的增益的多个宽带调谐器来延长整个系统的动态范围
公开(公告)号：US5590156A
公开(公告)日：1996-12-31
申请号：US231262
申请日：1994-04-22
申请人： Ronald Carney
发明人： Ronald Carney
IPC分类号： H04B1/10 , H04W28/26 , H04W72/04 , H04W74/00 , H04W88/08 , H03K9/00 , H04B1/06 , H04Q11/00
CPC分类号： H04W72/085 , H04B1/109 , H04W28/26 , H04W74/00 , H04W88/08
摘要： A technique for extending the instantaneous dynamic range available in a wideband digital basestation for use in a wireless communication network. The basestation processes the bandwidth allocated to it in two or more sub-bands. The sub-bands are each processed by a digital tuner section consisting of an amplifier, analog-to-digital (A/D) converter, and digital filter bank. The digital filter bank may make use of multirate digital signal recovery techniques for efficient implementation. In operation, a received signal strength indication (RSSI) is first determined for each subscriber unit requesting access to the basestation. A channel assignment controller then assigns a transmit frequency to the subscriber unit depending upon this RSSI. In particular, subscriber units exhibiting a relatively stronger RSSI are to transmit on a frequency assigned to a first digital tuner section, while subscriber units having a relatively weak RSSI are assigned to a second digital tuner section. The gains of the first and second tuner sections of each other adjusted independently, to insure that the relatively strong signals are not clipped by the first tuner section, and that the relatively weak signals may be correctly detected by the second tuner section. The net effect is to provide a much greater overall system dynamic range. The invention can be used to advantage in both existing AMPS type cellular systems as well as CDMA systems.
摘要翻译：一种用于扩展无线通信网络中用于宽带数字基站的瞬时动态范围的技术。基站处理在两个或多个子带中分配给它的带宽。每个子频带都由一个由放大器，模拟（A / D）转换器和数字滤波器组组成的数字调谐器部分进行处理。数字滤波器组可以利用多速率数字信号恢复技术来有效地实现。在操作中，首先为请求接入基站的每个用户单元确定接收信号强度指示（RSSI）。然后，信道分配控制器根据该RSSI向用户单元分配发送频率。特别地，呈现相对较强的RSSI的用户单元将以分配给第一数字调谐器部分的频率进行发送，而具有较弱RSSI的用户单元被分配给第二数字调谐器部分。彼此的第一和第二调谐器部分的增益被独立地调整，以确保相对强的信号不被第一调谐器部分限幅，并且相对较弱的信号可被第二调谐器部分正确检测。净效果是提供更大的整体系统动态范围。本发明可以在现有的AMPS型蜂窝系统以及CDMA系统中有利地使用。

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