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Performance evaluation of a receiver-based handshake protocol for CDMA networks

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2 Author(s)
Songchar Jiang ; Dept. of Electr. Eng. & Technol., Nat. Yunlin Inst. of Technol., Touliu City, Taiwan ; M. -T. T. Hsiao

A receiver-based handshake (RBHS) protocol for multipacket channels, such as code-division multiple-access (CDMA) networks, is proposed and its throughput and delay performance is analyzed. This scheme is based on a sensing period and a handshake procedure which can avoid collision and eliminates unwanted transmissions. Several system models under different assumptions, such as completely orthogonal codes and very large processing gain (we call it perfect channel) or with quasiorthogonal codes (nonperfect channel), are investigated. We assume the channel error probability due to other users' interference to be a function of the number of transmissions in a given slot as well as other system parameters. Under a slotted structure with uniform traffic assumption, the system is modeled as a discrete-time two-dimensional Markov chain. The analysis, based on various channel conditions, demonstrates that the average throughput and delay are significantly improved over other spreading code protocols, especially when the channel is likely to accommodate more channel errors, and when the handshaking time is reasonably short compared to the average packet length

Published in:

IEEE Transactions on Communications  (Volume:43 ,  Issue: 6 )