Subcarrier PIC Scheme for High Capacity CI/MC-CDMA System with Variable Data Rates

Power and Spectral Efficient Multiuser Broadband Wireless Communication System

“…Fig. 18 shows graphical representation for BER performance with the number of users for subcarrier parallel interference cancelation (PIC) (Maity & Mukherjee;, code and subcarrier PIC and trellis coded system for 'N'=16 and SNR=14 dB. It is found that trellis coded system provides significant improvement in BER performance even at less number of interference cancelation stage compared to the same for higher stage interference cancelation of subcarrier PIC and combined code & phase PIC.…”

A novel code-based iterative PIC scheme for multirate CI/MC-CDMA communication

“…The scheme represented by Equation (27) is referred as hard decision PIC (HDSub-PIC) [25]. The BER performance of Sub-PIC improves significantly by taking soft estimation of the interfering users.…”

“…In Figure 6, the performance of Code-PIC is compared with Block-PIC [24] and Sub-PIC [25] for 2N system with hard decisions. 64 (1N) HDR users, 32 LoDR (N/2) users (using odd subcarrier) and 32 LoDR (N/2) users (using even subcarrier), i.e., a total of 128 users transmit data simultaneously.…”

“…This section evaluates the computational complexities of conventional PIC [24], Block-PIC [24], Sub-PIC [25] and Code-PIC for multirate CI/MC-CDMA system over AWGN channel. Computational complexity per bit period of PIC algorithm is computed in terms of number of HDR users (K 1 ), number of LoDR users (K 2 ), number of available subcarriers (N) and number of iterations (num_iter) [31].…”

“…Single user bound with a 1dB off is obtained in Block-PIC at a BER of 1e-03. In [25], subcarrier PIC (Sub-PIC) has been developed for high-capacity CI/MC-CDMA with variable data rates. Although the system capacity has been increased up to three times (i.e., system capacity 3N), higher BER restricts real-time data communication.…”