Title :
Performance of a wireless access protocol on correlated Rayleigh-fading channels with capture
Author :
Chockalingam, A. ; Zorzi, Michele ; Milstein, Laurence B. ; Venkataram, Pallapa
Author_Institution :
Qualcomm. Inc., San Diego, CA, USA
fDate :
5/1/1998 12:00:00 AM
Abstract :
The throughput performance of a wireless media access protocol taking into account the effect of correlated channel fading, capture, and propagation delay is analyzed. For efficient access on the uplink (mobile-to-base-station link), the protocol makes use of the uplink channel status information which is conveyed to the mobiles through a busy/idle flag broadcast on the downlink (base-station-to-mobile link). A first-order Markov model is used to describe the correlation in the packet success/failure process on a Rayleigh-fading channel. The analytical results obtained through the first-order Markov approximation of the channel are compared to those obtained from an independent and identically distributed (i.i.d.) channel model. The Markovian-fading channel model is shown to provide better performance results than the i.i.d. channel model. Simulations show that a first-order Markov approximation of the Rayleigh-fading process is quite accurate. An enhanced version of the access protocol to take advantage of the memory in the fading channel behavior is proposed and analyzed. The effect of retransmission of erroneous data packets and propagation delay on the throughput is also analyzed. It is shown that the access protocol with an error detect (ED) feature is efficient in slow fading (e.g., pedestrian user speeds), whereas a retransmission protocol is more efficient in fast fading (e.g., vehicular user speeds)
Keywords :
Markov processes; Rayleigh channels; access protocols; correlation theory; fading; land mobile radio; packet radio networks; Markovian-fading channel model; Rayleigh-fading channel; base-station-to-mobile link; busy/idle flag broadcast; capture; channel status information; correlated Rayleigh-fading channels; downlink; erroneous data packets; error detect; first-order Markov approximation; first-order Markov model; i.i.d. channel; independent identically distributed channel; mobile-to-base-station link; packet success; packet success/failure; pedestrian user; propagation delay; retransmission; retransmission protocol; throughput performance; uplink; vehicular user; wireless access protocol; wireless media access protocol; Access protocols; Broadcasting; Computer vision; Downlink; Fading; Media Access Protocol; Performance analysis; Propagation delay; Rayleigh channels; Throughput;
Journal_Title :
Communications, IEEE Transactions on