Accession Number : ADA187487

Title :   Spread Spectrum Mobile Radio Communications.

Descriptive Note : Interim scientific rept. 1 Mar-30 Sep 87,

Corporate Author : SOUTHERN METHODIST UNIV DALLAS TEX DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Gupta, S C

PDF Url : ADA187487

Report Date : 30 Sep 1987

Pagination or Media Count : 35

Abstract : This report considers packet radio performance in mobile fading channels. The first chapter considers th optimal packet size for NPCSMA scheme in mobile fading channels. Here, modified expression for the channel throughput of nonpersistent carrier sense multiple access protocol (NPCSMA) in slow Nakagami fading channel is given. The optimal packet size and the acknowledgement size are obtained such that a maximum number of users can share the channel while maintaining reliable values for both the probability of packet and acknowledgement error. Meanwhile the useful throughput is also insured to be at maximum value. The second chapter considers packet radio performance over fast fading channels. Here, expressions for the throughput and packet delay of nonpersistent carrier sense multiple access (NPCSMA) protocol in fast fading environment are derived. Upper and lower bounds are obtained for a case where the fading phenomena is neither slow or fast. An alternative technique is used to approximately predict the performance for the cases that exist between these bounds. Both Nakagami fading and noncoherent reception are assumed.

Descriptors :   *CHANNELS, *RADIO EQUIPMENT, *FADING(ELECTROMAGNETIC WAVES), THROUGHPUT, MOBILE, PACKETS, INCOHERENCE, RECEPTION, RELIABILITY

Subject Categories : Radio Communications
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE