A Coding Transmission Scheme with Distributed Differential Space-Time for Fast Fading Channels

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A Coding Transmission Scheme with Distributed Differential Space-Time for Fast Fading Channels

更新时间：2025-07-09

- A Coding Transmission Scheme with Distributed Differential Space-Time for Fast Fading Channels
- Vol. 46, Issue 4, Pages: 77-82(2012)
- 作者机构：
  
  西安交通大学电子与信息工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN929.5
- Online First：10 April 2012，
  
  Published：2012
- 稿件说明：
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A Coding Transmission Scheme with Distributed Differential Space-Time for Fast Fading Channels[J]. 2012, 46(4): 77-82.
DOI：

A Coding Transmission Scheme with Distributed Differential Space-Time for Fast Fading Channels[J]. 2012, 46(4): 77-82. DOI：

摘要

针对分布式差分空时编码(DDSTC)在时间选择性快衰落信道中出现误码率平台的问题

提出了一种新的有效减小信号帧长的DDSTC传输方案(RFL-DDSTC)来抵抗快衰落信道的影响.该方案在中继节点处通过采用T个正交向量

将DDSTC在T个符号周期内的信号合并到1个符号周期内进行转发

使得DDSTC信号变为具有单位帧长的短信号.在目的节点

再对合并后的RFL-DDSTC信号用T个正交向量进行解调

即可还原出原始的DDSTC信号.该方案由于大大缩短了DDSTC信号的帧长

因而可以有效减小信道快衰落带来的不利影响

显著地降低了DDSTC性能曲线中的平台.仿真结果表明

在发射功率为30 dB时

RFL-DDSTC方案可将DDSTC的误码率平台降低一个数量级以上.

Abstract

A new DDSTC scheme with reduced frame length

named as RFL-DDSTC

is proposed to solve the problem that the performance of distributed differential space-time coding(DDSTC)suffers from an irreducible error floor in time-selective fast fading channels. The proposed RFL-DDSTC scheme uses T orthogonal vectors at relay nodes to combine the DDSTC signals in T symbol periods into one symbol period so that DDSTC can be turned into a shorter signal with unit length Then

the T orthogonal vectors are used at the destination node to demodulate the compressed RFL-DDSTC signals

and the original DDSTC signals are resumed. Since the frame length of DDSTC is greatly reduced

the proposed RFL-DDSTC is highly effective in mitigating the impact of channel fast fading on its performance

and the performance error floor has degraded significantly. Simulation results show that RFL-DDSTC can degrade the error floor of DDSTC for more than ten times at 30 dB.

关键词

Keywords

references

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