CAJ | 학술논문

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3 dB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.
상대우상간검측,유우재수발단불수요신도상태신식,비상간UWB통신재신조비방면회유근3 dB적성능손실.위료극복저일성능차거,제출료일충유효적기우다빈대UWB계통적차분편역마방안.해방안재발사단사용2개병행급련적체귀유차분공빈편마기대수거진행편마.접수단적2개분량역마기통과호상교환연도량치대수거진행역마.위료강저접수궤적계산복잡도,급출일충지사용전이개솔계산신식비특사연비적역마산법.방진결과표명,재교소질대차수하,산법성능원우우전통비상간검측,재고신조비시,기성능심지초과료상간검측.
Due to not requiring channel state information (CSI) at both the transmitter and the receiver,noncoherent ultra-wideband (UWB) incurs a performance penalty of approximately 3 dB in the required signal to noise ratio (SNR) compared to the coherent case.To overcome the gap,an effective differential encoding and decoding scheme for multiband UWB systems is proposed.The proposed scheme employs the parallel concatenation of two recursive differential unitary space-frequency encoders at the transmitter.At the receiver,two component decoders iteratively decode information bits by interchanging soft metric values between each other.To reduce the computation complexity,a decoding algorithm which only uses transition probability to calculate the log likelihood ratios (LLRs) for the decoded bits is given.Simulation results show that the proposed scheme can dramatically outperform the conventional differential and even coherent detection at high SNR with a few iterations.