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1.发明公开
公开(公告)号：EP1416691A1
公开(公告)日：2004-05-06
申请号：EP02024392.9
申请日：2002-11-04
CPC分类号： H04L27/0014 , H03C3/40 , H03D3/009 , H04L2027/0016 , H04L2027/0018 , H04L2027/003
摘要： The underlying invention generally relates to the field of coherent modulator architectures for the processing of modulated RF signals of digital communication systems, especially to a processing unit realizing an effective I/Q imbalance correction for high-level modulation schemes, e.g. 16-QAM or 64-QAM, under the coexistence of a carrier frequency error ( Δf RF ).
According to one embodiment of the underlying invention, an I/Q modulator of a quadrature transmitter comprising a processing unit (302) for correcting the amplitude and phase of the I and Q signals by calculating calibration coefficients (h(M)) is applied, wherein the processing unit (302) is specially designed to carry out the following steps in order to calculate said calibration coefficients ( h ( M )): a) using a number of M signal samples in order to calculate initial calibration coefficients ( h k ( M )), wherein M is an integer value which is larger than 1, and b) calculating averaged calibration coefficients ( h ( M )) by averaging a plurality of said initial calibration coefficients ( h k ( M )) obtained by repeating step a) for a limited number of K repetitions, wherein K denotes an integer larger than 1. The averaged calibration coefficients ( h ( M )) are then used to correct the I and Q imbalance.摘要翻译： 使用多个M个样本重复计算初始校准系数（hk（M）），其中M'是大于1'的整数。 通过校正基于同相/正交（I / Q）信号的初始校准系数的平均来计算平均校准系数（h（M））。 还包括以下独立权利要求：（1）同相/正交调制器; （2）同相/正交调制器操作方法; 和（3）同相/正交解调器。
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2.发明公开
公开(公告)号：EP1379026A1
公开(公告)日：2004-01-07
申请号：EP02023055.3
申请日：2002-10-16
发明人： Boehnke, Ralf, Adv. Tech. Center Stuttgart , Amir-Alikhani, Hamid, Adv. Tech. Center Stuttgart , Uno, Masahiro, Adv. Tech. Center Stuttgart , Stirling-Gallacher, R, Adv. Tech. Center Stuttgart
IPC分类号： H04L12/28
CPC分类号： H04W76/15 , H04B1/7163 , H04W28/22 , H04W84/18 , H04W88/06
摘要： The invention pertains to a dual-mode wireless transmission system operated in a wireless ad-hoc manner using a low-bit-rate, continuous wireless signaling channel for conveying a wireless status and/or control information and a high-bit-rate data channel assigned on demanded bases at the same time. In this connection, the low-bit-rate channel assists and manages the high-bit-rate data channel. Furthermore, the low-bit-rate wireless channel and the high-bit-rate data channel employ different radio transmission technologies (optimized for the specific purpose) and are operated logically in parallel.
摘要翻译： 本发明涉及以无线自组织方式操作的双模式无线传输系统，其使用低比特率连续无线信令信道来传送无线状态和/或控制信息和高比特率数据信道 同时分配在要求的基地上。 在这方面，低比特率信道协助和管理高比特率数据信道。 此外，低比特率无线信道和高比特率数据信道采用不同的无线电传输技术（针对特定目的而优化）并且在逻辑上并行运行。
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