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中文摘要：
本文提出了采用数据扩展技术在正交频分复用（OFDM）系统中实现不等错误保护（UEP）传输的自适应调制算法。利用原始数据符号传输特性相同的特点,分别研究了以提高信道容量为目标,功率一定,最大化传输速率的不等错误保护UEP算法;以及以用户需求为目标,传输速率一定,最小化总功率的不等错误保护UEP算法。这两种算法均可根据待传输数据的要求,保证不同优先级数据的不同传输质量和不同传输速率。仿真结果表明,最大化传输速率UEP算法可以在速率最大化的同时,保证传输质量要求;最小化总功率UEP算法可以在最小化发射功率的前提下,保证传输质量要求。与传统OFDM系统中相应算法的比较结果可以看出,采用数据扩展技术可以大大降低算法复杂度,减少有关调制参数信息的传输,在实现UEP时,在性能和复杂度之间具有较好的折中,具有较高的实际应用价值。
英文摘要：
This paper proposes an adaptive modulation algorithm to realize unequal error protection （UEP） transmission in data spread Orthogonal Frequency Division Multiplexing （OFDM） systems.Based on the fact that the original data symbols have the same transmission characteristic,we respectively research an UEP algorithm to maximize the transmission rate with given power restriction aiming at increasing channel capacity,and an UEP algorithm to minimize the transmission power with given rate restriction aiming at satisfying the users＇ requirements.Both algorithms can guarantee the different transmission qualities and different transmission rates of different priority data,according to the data＇s requirements.The simulation results indicate that the maximizing rate UEP algorithm can ensure the transmission quality requirements with maximal rate,as well as the minimizing power UEP algorithm can ensure the transmission quality requirements with minimum power.The results of comparison with corresponding traditional OFDM algorithms show that data spread UEP algorithm can reduce algorithm complexity greatly,can decrease the modulation parameters transfer evidently,and can balance between performance and complexity,thus it has better application value.
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