Virtual user pairing based non‐orthogonal multiple access in downlink coordinated multipoint transmissions

Non-orthogonal multiple access in downlink coordinated multipoint transmissions

“…This paper considers M number of CoMP BSs within N number of cells. To keep in line with previous work for comparison, each cell which is coordinated contains one BS, one CCU, and one CEU [11]. Each i th cell represents coverage of each i th BS (i ∈ 1, 2, ..., N ).…”

“…In this case, BS antenna high and BS distances to the other BSs are assigned by 0.01R and 2R, respectively. Moreover, d ij and d ik can be calculated, as the j th CCU and the k th CEU distance from the i th BS antenna respectively, using the concept of trigonometry [7,11].…”

“…In downlink multi-cell network, inter-cell interference (ICI) is one of the critical issues because it may degrade the system performance, such as user throughput and cell capacity. Coordinated multi-point (CoMP) is introduced as an ICI mitigation technique that may escalate capacity of NOMA [5][6][7][8][9][10][11]. In a conventional CoMP, one CEU is served by joint transmissions of multiple coordinated BSs simultaneously to improve its performance [5][6][7].…”

“…To handle multiple CEUs, several multiple CoMP-user techniques have been developed [8][9][10][11]. In [11], a joint transmission coordinated multi-point combined with virtual user pairing based non-orthogonal multiple access (JT-CoMP VP-NOMA) was proposed to handle multiple CEUs paired with one CCU. Evaluating JT-CoMP VP-NOMA in [11], it assumed a cluster contains a number of both cells and users have been predetermined.…”

“…In [11], a joint transmission coordinated multi-point combined with virtual user pairing based non-orthogonal multiple access (JT-CoMP VP-NOMA) was proposed to handle multiple CEUs paired with one CCU. Evaluating JT-CoMP VP-NOMA in [11], it assumed a cluster contains a number of both cells and users have been predetermined. JT-CoMP VP-NOMA may not be efficient while the cluster contains a lot of cells and/or each cell contains a lot of CEUs [12].…”