一种采用信号虚拟分解的多址接入方法

Virtual signal decomposition based multiple access method

多用户通信系统中的共道干扰是制约无线通信系统性能改善的关键因素。现有的基于信号处理的多用户传输方法在调整信号以避免共道干扰的同时,也会损害以这些信号为载体的数据传输的性能。利用无线信号间的相互作用,提出一种基于信号虚拟分解的多址接入方法,通过引入一个调和发射机,并使该调和发射机发送一个调和信号,调和信号与公共接收机处的多用户信号相互作用,可以使公共接收机无干扰地恢复出相互正交的多路期望信号。所提方法不仅能够避免期望发射机因对其发射信号进行调整而导致的期望信号传输质量的降低,而且不存在因公共接收机抑制干扰导致的期望信号功率损失问题。仿真结果表明,相比于已有方法,当信噪比超过0分贝时,所提方法对多用户通信系统的频谱效率和功率归一化频谱效率的改善超过10%。

Co-channel interference(CCI)is a key factor that impedes the improvement of a wireless communication system’s performance.Existing signal processing based multi-user transmission schemes avoid CCI by adjusting the interfering signals.However,they may degrade the performance of data transmissions carried in the adjusted signals.By exploiting interactions among wireless signals,a virtual signal decomposition based multiple access(VSDMA)method is proposed.By employing a coordinate transmitter(Tx)and letting it send a coordinate signal to interact with signal components originating from multiple interfering Txs at the common receiver(Rx),the Rx can recover multiple orthogonal desired signals without interference.The proposed method can not only avoid the degradation of desired transmission’s quality incurred by adjusting the transmitted signal at the Tx but also circumvent the problem of the desired signal’s power loss at the common Rx while it suppresses interference.Simulation results have shown that compared to existing schemes,given a signal-to-noise ratio greater than 0dB,our method can improve the spectral efficiency(SE)and power normalized SE of the multi-user communication system by over 10%.