The matrix inversion operation is needed in the MMSE decoding algorithm of orthogonal space-time block coding （OSTBC） proposed by Papadias and Foschini. In this paper, an minimum mean square error （MMSE） decoding ...The matrix inversion operation is needed in the MMSE decoding algorithm of orthogonal space-time block coding （OSTBC） proposed by Papadias and Foschini. In this paper, an minimum mean square error （MMSE） decoding algorithm without matrix inversion is proposed, by which the computational complexity can be reduced directly but the decoding performance is not affected.展开更多
In contrast with orthogonal multiple access(OMA)technologies,non-orthogonal multiple access(NOMA)technology can achieve higher spectral effi-ciency and support more users simultaneously.Multiple relays can be deployed...In contrast with orthogonal multiple access(OMA)technologies,non-orthogonal multiple access(NOMA)technology can achieve higher spectral effi-ciency and support more users simultaneously.Multiple relays can be deployed in NOMA networks,in order to combat fading and thus increase the transmission reliability.In the existing works on cooperative NOMA networks with multiple relays,the decoding error at the relays and the imperfect successive interference cancellation(SIC)are not taken into account simultaneously.In this work,we consider the bit error rate(BER)analysis of relay-aided NOMA networks,where max-min relay selection is employed.Particularly,closed-form BER expressions are derived for NOMA networks with Rayleigh fading,in the existence of the relay decoding error and imperfect SIC.The asymptotic BER performance is then obtained to provide some useful insights into the system design such as the diversity order.Finally,simulation results illustrate the correctness of the derived expressions.The presented results reveal the effects of imperfect SIC and relay decoding error on the performance of cooperative NOMA networks.展开更多
A non-unitary non-coherent space-time code which is capable of achieving full algebraic diversity is proposed based on full diversity space-time block coding, The error performance is optimized by transforming the non...A non-unitary non-coherent space-time code which is capable of achieving full algebraic diversity is proposed based on full diversity space-time block coding, The error performance is optimized by transforming the non-unitary space-time code into unitary space-time code, By exploiting the desired structure of the proposed code, a grouped generalized likelihood ratio test decoding algorithm is presented to overcome the high complexity of the optimal algorithm, Simulation results show that the proposed code possesses high spectrum efficiency in contrast to the unitary space-time code despite slight loss in the SNR, and besides, the proposed grouped decoding algorithm provides good tradeoff between performance and complexity,展开更多
文摘The matrix inversion operation is needed in the MMSE decoding algorithm of orthogonal space-time block coding （OSTBC） proposed by Papadias and Foschini. In this paper, an minimum mean square error （MMSE） decoding algorithm without matrix inversion is proposed, by which the computational complexity can be reduced directly but the decoding performance is not affected.
基金This work was supported by the National Natural Science Foundation of China under Grants 61971360 and 61871139.
文摘In contrast with orthogonal multiple access(OMA)technologies,non-orthogonal multiple access(NOMA)technology can achieve higher spectral effi-ciency and support more users simultaneously.Multiple relays can be deployed in NOMA networks,in order to combat fading and thus increase the transmission reliability.In the existing works on cooperative NOMA networks with multiple relays,the decoding error at the relays and the imperfect successive interference cancellation(SIC)are not taken into account simultaneously.In this work,we consider the bit error rate(BER)analysis of relay-aided NOMA networks,where max-min relay selection is employed.Particularly,closed-form BER expressions are derived for NOMA networks with Rayleigh fading,in the existence of the relay decoding error and imperfect SIC.The asymptotic BER performance is then obtained to provide some useful insights into the system design such as the diversity order.Finally,simulation results illustrate the correctness of the derived expressions.The presented results reveal the effects of imperfect SIC and relay decoding error on the performance of cooperative NOMA networks.
基金Supported by the National Natural Science Foundation of China (Grant No. 60372055)the National Doctoral Foundation of China (Grant No. 20030698027)
文摘A non-unitary non-coherent space-time code which is capable of achieving full algebraic diversity is proposed based on full diversity space-time block coding, The error performance is optimized by transforming the non-unitary space-time code into unitary space-time code, By exploiting the desired structure of the proposed code, a grouped generalized likelihood ratio test decoding algorithm is presented to overcome the high complexity of the optimal algorithm, Simulation results show that the proposed code possesses high spectrum efficiency in contrast to the unitary space-time code despite slight loss in the SNR, and besides, the proposed grouped decoding algorithm provides good tradeoff between performance and complexity,
