The role of coding in CDMA systems with multiuser detection
- 22 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
In a direct sequence code division multiple access (CDMA) system, a fixed bandwidth expansion could be allocated to either error correcting coding or modulation signal spreading. The role of coding in CDMA systems that employ multiuser detection is explored here. A comparison is made between the maximum throughputs (in bits/chip or bits/s/Hz) achievable using multiuser detection and single-user detection, for both "single-cell" and cellular systems. For the single-cell scenario, our results indicate that asynchronous multiuser detection systems employing long (random) spreading sequences and low rate coding, can provide considerable improvements in spectral efficiency over single-user detection systems. However, for cellular systems with universal frequency reuse, the improvement is spectral efficiency (per cell) offered by multiuser detection may not be as significant.Keywords
This publication has 5 references indexed in Scilit:
- The coding-spreading tradeoff in CDMA systemsIEEE Journal on Selected Areas in Communications, 2002
- Probability of error in MMSE multiuser detectionIEEE Transactions on Information Theory, 1997
- Blind adaptive multiuser detectionIEEE Transactions on Information Theory, 1995
- User-separating demodulation for code-division multiple-access systemsIEEE Journal on Selected Areas in Communications, 1994
- Throughput Analysis for Code Division Multiple Accessing of the Spread Spectrum ChannelIEEE Journal on Selected Areas in Communications, 1984