5G New Radio Prototype Implementation Based on SDR

Abstract

The fifth generation (5G) New Radio (NR) has been developed to provide significant improvements in scalability, flexibility, and efficiency in terms of power usage and spectrum as well. To meet the 5G vision, service and performance requirements, various candidate technologies have been proposed in 5G new radio; some are extensions of 4G and, some are developed explicitly for 5G. These candidate technologies include non-Orthogonal Multiple Access (NOMA), and Low Density Parity Check (LDPC) channel coding. In addition, deploying software defined radio (SDR) instead of traditional hardware modules. In this paper we build an open source SDR-based platform to realize the transceiver of the physical downlink shared channel (PDSCH) of 5G NR according to Third Generation Partnership Project (3GPP) standard. We provide a prototype for pairing between two 5G users using NOMA technique. In addition, a suitable design for LDPC channel coding is performed. The intermediate stage of segmentation, rate matching and interleaving are also carried out in order to realize a standard NR frame. Finally, experiments are carried out in both simulation and real time scenario on the designed 5G NR for the purpose of system performance evaluation, and to demonstrate its potential in meeting future 5G mobile network challenges.

Outage Performance of Pairwise NOMA Allowing a Dynamic Decoding Order and Optimal Pairs of Power Levels

“…The two source nodes need to receive these power allocations before transmitting somehow. To successfully decode both signals at the AP, the achievable rates in (9) and (10) have to exceed the target rates, i.e.,…”

“…Therefore, to reduce the complexity as well as cost of the receivers, the number of active NOMA users at the same time should not be too large [8]. Due to this practical constraint, many previous papers have evaluated the performance of pairwise NOMA, i.e., NOMA with at each time-frequency instance only two users transmitting to an AP in the uplink phase, or receiving a superimposed signal from the AP in the downlink phase [9]- [14]. In this scenario, efficient user pairing plays an important role [15] and thus proper selection of the users for pairing has attracted much attention in the literature [16].…”

Performance Analysis Of Non-Orthogonal Multiple Access Technique Using Simulink

“…At NOMA transmitter the signals from different sources are multiplexed with different gains in powers [3]. Where power allocated for the User-2 (far user, cell edge) is more compared to power of User-1 (near user, cell center) [7].…”

“…Assuming the SIC is ideal then UE1 signal detection is be expressed as [3], (13) Similarly estimated symbol at UE2 is [3], (14) In the above implementation, the number of users considered were two, if there are inumber of users in total and assuming perfect SIC, then the user a's signal detection at receiver can be expressed as [4] (15)…”

“…In downlink NOMA, at the base station Superposition Coding (SC) is employed and at the User end SIC implemented [6]. Consider data from K channels multiplexed onto single carrier using SC and SIC [2] at User side in decoding data intended for particular User in Figure (3). In case of downlink at any user farthest user's signal is decoded first since it has been allocated with more power compared to among other users, in this process signals intended for other users is assumed as noise.…”