Multipacket reception in MIMO-OFDM systems

• Published in: ISCIT 2005 : International Symposium on Communications and Information Technologies 2005 : proceedings : October 12-14, 2005, Beijing, China Vol. 2; pp. 1156 - 1159
• Main Authors: Chengkang Pan, Yueming Cai, Youyun Xu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2005
• Subjects: Access protocols; Array signal processing; Bit error rate; Frequency conversion; Media Access Protocol; Multiaccess communication; Performance analysis; Physical layer; Signal processing; Wireless application protocol
• ISBN: 9780780395381; 0780395387
• DOI: 10.1109/ISCIT.2005.1567074

The medium access control (MAC) layer in many wireless systems is designed to serve one user at a slot when conventional slotted ALOHA protocol is applied. However, the problem of packet collisions can be solved at the physical (PHY) layer by using signal processing technique. By exploiting orthogonal frequency division multiple access (OFDMA) and spatial division multiple access (SDMA), a decentralized MAC strategy with multi-packet reception (MPR) is proposed for MIMO-OFDM systems. First, employing receive beamforming, we study the possible optimal number of users which are likely to transmit at the same subcarrier and slot to maximize the separable packets subject to their BER (SINR) requirements. Then the transmission probability is designed to achieve the desired number of users. The performance and benefits of the proposed strategy is analyzed analytically and evaluated through simulations.