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分布式天线、智能天线和扇区天线是三种能大大提高无线通信系统容量的技术 ,本文比较了这三种多天线系统的信道 (Shannon)容量 .假设每个用户在所有接收天线上的总功率相等 ,分析表明分布式天线和扇区天线的信道容量远大于智能天线的信道容量 ,而传统的观点认为智能天线在抑制干扰时要比扇区天线的性能更好 ,从而获得更大的系统容量 .另外我们分析了分布式天线在渐近条件下的信道容量 ,即用户数K和载波数M都趋近无穷大 ,而保证α =K/M一定 .分析表明在α较大时 ,分布式天线与比扇区天线的信道容量差趋近常数 0 4 4比特 /秒 /维 ,但是如果考虑分布式天线的分集增益 ,那么分布式天线的信道容量要远大于扇区天线 .
Distributed Antennas, Smart Antennas, and Sector Antennas are three techniques that greatly increase the capacity of wireless communication systems. This article compares the Shannon capacity of these three multi-antenna systems. Assuming that each user has a total The power is equal, the analysis shows that the distributed antenna and sector antenna channel capacity is much larger than the smart antenna channel capacity, while the traditional view that the smart antenna to suppress interference than the sector antenna better performance, resulting in a larger system In addition, we analyze the channel capacity of distributed antennas under asymptotic conditions, that is, the number of users K and the number of carriers M are close to infinity while ensuring that α = K / M is constant.The analysis shows that when α is large, distributed The channel capacity difference between the antenna and the sector antenna approaches a constant of 0 4 4 bits / sec / dimension, but the distributed antenna has much larger channel capacity than the sector antenna if the diversity gain of the distributed antenna is taken into account.