提出了一种改进的准正交编码,推导了四发一收系统中采用改进的准正交空时分组码的系统容量公式.比较了新编码方式和正交编码方式及TBH编码方式下信道的容量.结果表明,信噪较高时,改进后的编码方法的容量高于现有编码方案的信道容量.另外,仿真证明了新编码的信道容量在发送天线数一定时随信噪比和接收天线数的增大而增大.%The anti-intereference ability can be strengthened while the BER can be decreased when STBC is applied to MIMO system. The existed quasi-orthogonal code TBH can implove the system capacity effectively, but the effectiveness is non-ideal when the SNR is very high. In this paper,an imploved quasi-orthogonal code was introduced. Ergodic capacity of the 4X1 systems with the imploved quasi-orthogonal code was deserved. Capacity of the TBH system, orthogonal code system and the improved coding system was compared. The result shows that capacity of the imploved code was much better than that of the existed code. Besides, channel capacity of the improved coding increased with the SNR and number of receiving antennas.
展开▼
