摘要
为了解决码分多址(CDMA)和频分多址(FDMA)编码协作系统中协作用户之间存在的冲突和碰撞问题,提出了一种采用帧延迟的实时编码协作方案.该方案将用户信道码字分割为2部分,如果某个用户对协作伙伴前一帧数据成功译码,则将协作伙伴前一帧码字的第2部分冗余作为协作信息传输,否则传输自身当前帧码字的第2部分冗余,从而实现实时编码协作.此外,还利用紧联合界技术推导了新方案的误比特率估计公式,给出了数值计算结果.数值结果表明:采用帧延迟的实时编码协作方案能够很好地解决CDMA和FDMA编码协作系统中协作用户之间的碰撞问题,但会有少量的性能损失,对于0 dB互易用户间信道,性能损失为1.2 dB.
To solve the collision problem between the partners in code-division multiple access （CDMA） and frequency-division multiple access （FDMA） coding cooperative systems, a new real time coding cooperation scheme is proposed with frame delay. The scheme partitions the user channel codeword into two parts. If one user decodes successfully his partner＇s previous frame data, he then transmits the second redundancy of the partner＇s previous frame as cooperative information, otherwise he transmits the second redundancy of his own codewords, so that the real coded cooperation is implemented. Furthermore, the bit-error-rate evaluation formula of the new scheme is derived using the tightening union bound techniques. Numerical results show that the real coding cooperation scheme with frame delay can solve the collision problem between the partners in CDMA and FDMA coding cooperative systems very well, but the proposed scheme would result in a little performance loss of 1.2 dB for 0 dB reciprocal inter-user channels.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第2期63-66,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(60602034)
关键词
码分多址
频分多址
帧延迟
实时编码协作
紧联合界
code-division multiple access
frequency-division multiple access
frame delay
real time coding cooperation
tightening union bound
