This paper deals with the multiuser medium access problem in the packet radio environment. Under the framework of network diversity multiple access (NDMA), a recently proposed medium access method, a blind collision resolution scheme is proposed employing rotational invariance and factor analysis techniques. The proposed approach (dubbed B-NDMA for Blind NDMA) overcomes the difficulty of orthogonal identification codes required by the original protocol, thereby improving channel utilization and system capacity, while being insensitive to multipath effects and synchronization errors. Performance issues of the proposed technique are addressed both analytically and numerically.
Bibliographical noteFunding Information:
Paper approved by A. K. Singh, the Editor for Packet Radio Access of the IEEE Communications Society. Manuscript received September 23, 1999; revised June 14, 2001. The work of N. D. Sidiropoulos was supported by the National Science Foundation under NSF/Wireless CCR-0096164 (9979295) and NSF/CAREER under CCR-0096165 (9733540). The work of M. K. Tsatsanis was supported by the National Science Foundation under NSF/NCR-9706658, NSF/CAREER CCR-9733048 and NSF/Wireless CCR-9979288.
- Access protocols
- Blind signal separation
- Matrix decomposition
- Packet radio
- Rotational invariance