Uplink BER Performance Comparison of Single-carrier Multi-access and Multi-carrier Multi-access
نویسندگان
چکیده
Abstract The downlink bit error rate (BER) performances of DSand MC-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. However, the uplink BER performance degrades due to strong multi-user interference (MUI) since different users’ signals go through different channels and hence the orthogonality among user is distorted. In this paper, we apply joint orthogonal frequency-interleaving and MMSE-FDE to turbo coded DSand MC-CDMA and their uplink BER performances are evaluated by computer simulation. Keyword DS-CDMA, MC-CDMA, Frequency-domain equalization, Frequency-interleaving
منابع مشابه
Multi-carrier multi-access using frequency-interleaving and its uplink BER performance
Abstract In direct sequence code division multiple access (DS-CDMA) and multi-carrier (MC)-CDMA, frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and to improve bit error rate (BER) performance. In MC-CDMA uplink, however, the BER performance significantly degrades due to strong multi-user interfe...
متن کاملSingle-carrier Frequency-Domain CDMA
Abstract Single-carrier (SC) transmission is an appropriate transmission scheme for uplink transmission because of its low peak-to-average power ratio (PAPR). Spread spectrum (SS) transmission achieves higher frequency diversity gain and hence improves the bit error rate (BER) performance. The authors have recently proposed SC with frequency-domain spread spectrum (SC-FDSS) transmission with or...
متن کاملPerformance Evaluation of Multi User Detection for Uplink Wireless Communications with Various Multiple Access Schemes
The growing demand for capacity in wireless communications is the driving force behind improving established networks and the deployment of new worldwide mobile standard. Multiple Access Interference (MAI) and Inter Symbol Interference (ISI) limit the capacity of the system. The conventional approaches for wireless communication may not be good in many ways. Here, a proposal has been given to s...
متن کاملPerformance of Multi-carrier Spread-spectrum Systems with Spatial Diversity and Pre-equalization
In this contribution, the benefit of applying channel knowledge at the transmitter is investigated for multi-carrier spread-spectrum (MC-SS) systems. Two different MC-SS systems are observed, namely uplink multi-carrier code-division multiple-access (MCCDMA) and spread-spectrum multi-carrier multiple-access (SSMC-MA). The latter system is considered for both downand uplink transmission. Pre-equ...
متن کاملFBMC/OQAM for the Asynchronous Multi-User MIMO Uplink
In this paper, we evaluate the performance of filter bank-based multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) for the multi-user multiple-input multiple-output (MIMO) uplink in the presence of timing and frequency misalignments. In such a scenario, multiple access is achieved by assigning groups of sub-carriers to user nodes. The nodes are equipped with multiple antennas...
متن کامل