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在无线多入单出(MISO)系统中,若发射机能通过接收机的有限反馈获取信道信息,则可采用简单的波束成形技术实现发射分集增益和阵列增益.已有的相关研究大多包含块衰落信道、准确信道估计或无反馈延迟等理想假设.本文考察了更为实际的存在信道估计误差和反馈延迟的Jakes时变MISO信道,推导了其遍历容量的上下界,并进一步在给定归一化反馈比特数条件下,根据容量下界求出了最优帧长.数值和仿真结果表明,容量的上下界较紧,信道估计误差或反馈延迟均会降低容量界,且最优帧长能使容量下界取得最大值.
In the MIMO system, if the transmitter can obtain the channel information through the limited feedback of the receiver, the transmit diversity gain and the array gain can be achieved by a simple beamforming technique.Most existing researches include block fading Channel, accurate channel estimation or no feedback delay etc. This paper investigates a more practical Jakes time-varying MISO channel with channel estimation error and feedback delay, derives the upper and lower bounds of its traversal capacity, The optimal frame length is obtained from the lower bound of capacity under the conditions of the number of feedback bits.The numerical and simulation results show that the upper and lower bounds of the capacity are tight and the channel estimation error or feedback delay will reduce the capacity boundary and the optimal frame length can make The lower limit of capacity gets the maximum value.