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Identical Code Cyclic Shift Multiple Access—A Bridge Between CDMA and NOMA.
- Source :
- IEEE Transactions on Vehicular Technology; Mar2020, Vol. 69 Issue 3, p2878-2890, 13p
- Publication Year :
- 2020
-
Abstract
- A traditional direct sequence CDMA (DS-CDMA) system works based on spreading codes, which should have good auto-correlation and cross-correlation properties to eliminate multiple access interference (MAI) and multipath interference (MI). However, to find a large number of good spreading codes is extremely difficult, and thus the capacity of a DS-CDMA system is limited strictly by the number of available spreading codes. This work proposes a downlink DS-CDMA design to enable multiple access using only one spreading code, namely identical code cyclic shift (ICCS) code, where in-phase and quadrature channels are used to transmit data and pilot, respectively. In particular, the ICCS code is used at a transmitter to perform DS modulation for user data, which is then sent to the in-phase channel. At the same time, the pilots are sent over the quadrature channel in a time-division multiplex (TDM) mode to construct a correlation matrix of ICCS code. At a receiver, MAI is removed by so-designed pilots plus a matched filter-bank. Simulation results show that the proposed ICCS multiple access (ICCSMA) can achieve a better performance than a traditional DS-CDMA system in a high signal to noise ratio region. ICCSMA serves as a bridge to turn CDMA to NOMA to enable massive connectivity in 5 G and beyond communications. [ABSTRACT FROM AUTHOR]
- Subjects :
- CYCLIC codes
SIGNAL-to-noise ratio
Subjects
Details
- Language :
- English
- ISSN :
- 00189545
- Volume :
- 69
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Vehicular Technology
- Publication Type :
- Academic Journal
- Accession number :
- 143316830
- Full Text :
- https://doi.org/10.1109/TVT.2020.2965718