DocumentCode :
970927
Title :
A study of CDPD forward channel performance with coherent and differential detection
Author :
Salkintzis, Apostolis K.
Author_Institution :
Motorola, Athens, Greece
Volume :
52
Issue :
4
fYear :
2004
fDate :
4/1/2004 12:00:00 AM
Firstpage :
559
Lastpage :
563
Abstract :
The media access control (MAC)-layer performance of the cellular digital packet data (CDPD) forward channel is studied and a new technique to improve the performance is proposed. The study is based on a computer simulation model wherein a CDPD base station continuously transmits a sequence of packets to a CDPD mobile station. We consider a Rayleigh fading channel and demonstrate how the performance metrics are affected by the channel characteristics. At the reception stage, we consider both coherent and differential reception. We argue that the throughput at the MAC layer is affected not only by the error performance of the physical layer, but also by several design characteristics of the MAC layer, including the block length and the alignment between blocks and packets. We illustrate the block error rate, packet error rate, and throughput performance by simulation results, and we show how the receiver may discard data, which is correctly received but nevertheless useless. Our main conclusion is that the CDPD forward-channel performance could be significantly improved should the identified deficiencies are eliminated. For this purpose, we propose a new automatic repeat request (ARQ) protocol that operates in the MAC layer to correct the erroneous blocks by means of retransmissions, and we study its performance. In addition, we discuss an adaptive scheme that maximizes the forward-channel performance by automatically enabling and disabling the ARQ protocol according to the channel conditions.
Keywords :
Rayleigh channels; access protocols; automatic repeat request; cellular radio; error statistics; packet radio networks; signal detection; ARQ protocol; Rayleigh fading channel; automatic repeat request protocol; block error rate; cellular digital packet data; coherent detection; differential detection; forward channel performance; media access control layer; packet error rate; Automatic repeat request; Base stations; Computer simulation; Error analysis; Fading; Measurement; Media Access Protocol; Mobile computing; Physical layer; Throughput;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2004.826352
Filename :
1291796
Link To Document :
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