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相对于相干检测,由于在收发端不需要信道状态信息,非相干UWB通信在信噪比方面会有近3dB的性能损失.为了克服这一性能差距,提出了一种有效的基于多频带UWB系统的差分编译码方案.该方案在发射端使用2个并行级联的递归酉差分空频编码器对数据进行编码.接收端的2个分量译码器通过互相交换软度量值对数据进行译码.为了降低接收机的计算复杂度,给出一种只使用转移概率计算信息比特似然比的译码算法.仿真结果表明,在较少迭代次数下,算法性能远优于传统非相干检测,在高信噪比时,其性能甚至超过了相干检测.
Compared with coherent detection, non-coherent UWB communication will have a loss of nearly 3dB in signal-to-noise ratio due to no need of channel state information at the transmitting and receiving end.In order to overcome this performance gap, an effective multi-band UWB system The scheme uses two parallel cascaded recursive unitary differential space frequency codes to encode the data at the transmitting end.The two component decoders at the receiving end decode the data by exchanging the soft metric values with each other. In order to reduce the computational complexity of the receiver, a decoding algorithm is proposed, which only uses the transition probability to calculate the bit-to-bit ratio of information bits.The simulation results show that the performance of the algorithm is much better than the traditional non-coherent detection with fewer iterations, High signal to noise ratio, its performance even exceeded the coherent detection.