公开(公告)号：US20080130772A1

公开(公告)日：2008-06-05

申请号：US12011658

申请日：2008-01-29

申请人： A. Roger Hammons ,  Hesham El-Gamal ,  Lin-Nan Lee ,  Stan Kay ,  Andrew MacDonald ,  Jack Rozmaryn ,  Bassel Beidas

发明人： A. Roger Hammons ,  Hesham El-Gamal ,  Lin-Nan Lee ,  Stan Kay ,  Andrew MacDonald ,  Jack Rozmaryn ,  Bassel Beidas

IPC分类号： H04L23/02

CPC分类号： H04L27/2602 ,  H04L1/0618

摘要： A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency coding. The base station includes a plurality of multiple-input multiple-output (MIMO) transceivers. The system includes a terminal that is configured to receive the modulated signal. The above arrangement is particularly applicable to providing multichannel multipoint distribution services (MMDS) over a radio communications system.

公开(公告)号：US06347124B1

公开(公告)日：2002-02-12

申请号：US09181905

申请日：1998-10-29

申请人： Yezdi Antia ,  Ludong Wang ,  Mohammad Soleimani ,  A. Roger Hammons

发明人： Yezdi Antia ,  Ludong Wang ,  Mohammad Soleimani ,  A. Roger Hammons

IPC分类号： H03D100

CPC分类号： H04L1/0045 ,  H04L1/0071 ,  H04L25/067 ,  H04L2001/0097

摘要： A system and method of soft decision decoding is disclosed. An average signal magnitude is generated from a plurality of message bits. A scale factor is generated in accordance with the average signal magnitude, and soft decision bits are generated by processing the message bits using the scale factor. The scale factor and soft decision bits are transmitted and received across a communication link. The soft decision bits are rescaled using the scale factor and then rounded to the nearest integer value. The rounded values are then decoded. The soft decision bits are generated using a quantization having at least two bits, and soft decision bits are preferably rescaled using at least five bits.

摘要翻译： 公开了一种软判决解码的系统和方法。 从多个消息比特生成平均信号幅度。 根据平均信号幅度产生比例因子，并且通过使用比例因子处理消息比特来产生软判决比特。 比例因子和软判决比特通过通信链路进行发送和接收。 软判决位使用比例因子重新缩放，然后舍入到最接近的整数值。 然后对舍入的值进行解码。 使用具有至少两个比特的量化产生软判决比特，并且优选地使用至少五比特来重新定标软判决比特。