公开(公告)号：US20020142745A1

公开(公告)日：2002-10-03

申请号：US09940637

申请日：2001-08-29

Applicant: GCT Semiconductor, Inc.

Inventor： Suwon Kang ,  Jeong-Woo Lee ,  Joonbae Park

IPC: H04B001/06

CPC classification number: H03G3/3068

Abstract: A wireless or wired communication system and method is provided including a transmitter and a receiver. A RF communication system in accordance with the present invention includes an apparatus and gain control method between RF receiver and baseband modem in case of a plurality of gain stages inside a receiver. The gain of each stage can be controlled by an integrated gain controller. The gain controller monitors the signal level of each gain stage to place its gain to optimal value. The gain control apparatus and method can be implemented in a digital AGC system. The gain controller accepts a signal implementing gain control and thus there is no stability issue. When distributed gain stages are present inside a related art receiver and separate gain control loops are used, stability issues can arise. In a preferred embodiment of an apparatus and method, the baseband modem decides the amount of gain control and adjusts the gain of certain gain stages by the proper amount.

Abstract translation: 提供了包括发射机和接收机的无线或有线通信系统和方法。 根据本发明的RF通信系统在接收机内的多个增益级的情况下包括RF接收机和基带调制解调器之间的装置和增益控制方法。 每个阶段的增益可以由集成增益控制器控制。 增益控制器监视每个增益级的信号电平，将其增益置于最佳值。 增益控制装置和方法可以在数字AGC系统中实现。 增益控制器接受实现增益控制的信号，因此没有稳定性问题。 当分布式增益级存在于相关技术的接收机内并且使用单独的增益控制回路时，可能会出现稳定性问题。 在装置和方法的优选实施例中，基带调制解调器确定增益控制量并且将某些增益级的增益调整适当的量。

公开(公告)号：US20040131109A1

公开(公告)日：2004-07-08

申请号：US10690629

申请日：2003-10-23

Applicant: GCT Semiconductor, Inc.

Inventor： Byoung-Hoon Kim ,  Suwon Kang ,  Bong Youl Cho ,  Kyeongho Lee

IPC: H04B001/707

CPC classification number: H04B1/7097 ,  H04B1/7115 ,  H04L25/03171

Abstract: A bidirectional turbo ISI canceller cancels precursor-ISI as well as postcursor-ISI in a received signal without incorporating a multiplicative feedforward equalization filter. This is accomplished by taking a three-step receiver design approach. In the first step, an optimal single-symbol RAKE receiver is designed to comprise a CMF, a codeword correlator bank, and an energy bias (EB) canceller under the assumption that no ISI is generated by preceding or trailing symbols. In a second step, a DFE is included for suppressing postcursor-ISI caused by a preceding symbol. Finally, a precursor ISI canceler is used to remove the remaining ISI caused by a trailing symbol. All three components may be integrated into a BTIC-based receiver applying turbo-iteration processing.

Abstract translation: 双向turbo ISI消除器在接收信号中取消前体ISI以及后端ISI，而不需要并入前置均衡滤波器。 这是通过采取三步接收机设计方法来实现的。 在第一步中，假定不存在由先前或后面符号产生的ISI，最佳单符号RAKE接收机被设计为包括CMF，码字相关器组和能量偏置（EB）消除器。 在第二步骤中，包括用于抑制由先前符号引起的后期ISI的DFE。 最后，使用前驱体ISI消除器去除由尾随符号引起的剩余ISI。 所有三个组件可以被集成到应用turbo迭代处理的基于BTIC的接收机中。