Differential modulated pilot symbol assisted adaptive OFDM for reducing the MLI with predicted FBI

被引：2

作者：

Ahn, CJ ^{[1
]}

Takahashi, S ^{[1
]}

Harada, H ^{[1
]}

机构：

[1] Inc Adm Agcy, NICT, Yokosuka, Kanagawa 2390847, Japan

来源：

IEICE TRANSACTIONS ON COMMUNICATIONS | 2005年 / E88B卷 / 02期

关键词：

AMS/OFDM; MLI; FBI;

D O I：

10.1093/ietcom/E88-B.2.436

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In an AMS/OFDM system, base station is in control of the modulation level of each subcarriers, and then, adaptive modulated packet is transmitted from the base station to the mobile station. In this case, the mobile station is required the modulation level information (MLI) to demodulate the received packet. The MLI is generally transmitted as a data symbol, therefore, the throughput is degraded. Moreover, it is necessary to have some transmission delay times and the processing time to make an adaptive modulation command (AMC) using feedback information (FBI). With the FBI delay and processing time, the system performance might be degraded. To reduce these problems, in this paper, we propose a differential modulated pilot symbol assisted adaptive OFDM for reducing the MLI with predicted FBI.

引用

页码：436 / 442

页数：7

共 10 条

[1] The effects of modulation combination, target BER, Doppler frequency, and adaptation interval on the performance of adaptive ofdm in broadband mobile channel [J].