| 1. | Recently , multiple input multiple output ( mimo ) system which originates from the employment of multiple antennas at transmitter and receiver has many advantages such as large system capacity , high spectral efficiency . on the other hand , orthogonal frequency division multiplexing ( ofdm ) which bases on the orthogonal transmission of sub - carriers also has some obvious merits such as strong anti - multipath ability , high spectral efficiency . the combination of the two techniques mimo - ofdm , has become a hotspot recently and regarded as promising technique for future next - generation mobile communication systems
近来,在无线通信系统中的收发两端同时使用多根天线的多入多出( mimo , multiple - input - multiple - output )通信结构,具有系统容量大、频谱效率高等优点;基于正交的多路子载波并行传输的正交频分复用( ofdm , orthogonalfrequencydivisionmultiplexing )技术,具有抗多径能力强、频谱效率高等优点,二者的结合,即mimo - ofdm技术,被认为是构建下一代移动通信系统的框架技术。 |
