Title :
Performance of frequency-hopped NPCSMA for broad-band personal communication services (B-PCS) at millimeter waves in an urban mobile radio environment
Author :
Hmimy, Hossam H. ; Gupta, Someshwar C.
Author_Institution :
Service Provisioning Organ., Ericsson Inc., Richardson, TX, USA
fDate :
1/1/1999 12:00:00 AM
Abstract :
A millimeter-wave (MMW) propagation model, based on multiray optical theory and the geometrical theory of diffraction (GTD), is used to statistically study the delay spread and coherence bandwidth (Bc ) for broad-band personal communication services (B-PCSs) in urban mobile radio environments. The results of the statistical model are compared with outdoor measurements near the street level with Bc varying over a range of frequencies (14-100 MHz). It is shown that the distribution of Bc depends on antenna heights, street layout, and frequency. The signal level statistics are evaluated and found to agree with the measurements. In general, these statistics are non-Rayleigh distributed. The additive thermal Gaussian noise (AGN) is calculated for such channels to evaluate the signal-to noise ratio (SNR). The performance of the medium-access control (MAC) sublayer is studied by first evaluating the probability of packet retransmission and then the performance of the FH-NPCSPMA protocol. The FH-NPCSMA protocol is the combination of frequency hopping spread spectrum (FH-SS) and nonpersistent carrier-sense multiple access (NPCSMA) that is proposed to improve the system throughput and average packet delay for both high traffic and multipath channels at MMW. The main advantage of the PH-NPCSMA protocol is to improve the performance over fading channels
Keywords :
Gaussian noise; broadband networks; carrier sense multiple access; delays; fading channels; frequency hop communication; geometrical theory of diffraction; millimetre wave propagation; multipath channels; packet radio networks; personal communication networks; probability; spread spectrum communication; statistical analysis; telecommunication traffic; thermal noise; 14 to 100 MHz; B-PCS; FH-NPCSPMA protocol; FH-SS; GTD; SNR; additive thermal Gaussian noise; antenna heights; average packet delay; broad-band personal communication services; coherence bandwidth; delay spread; fading channels; frequency; frequency hopping spread spectrum; frequency-hopped NPCSMA; geometrical theory of diffraction; high traffic channels; medium-access control sublayer; millimeter waves; millimeter-wave propagation model; multipath channels; multiray optical theory; non-Rayleigh distributed statistics; nonpersistent carrier-sense multiple access; outdoor measurements; packet retransmission probability; signal level statistics; signal-to noise ratio; statistical model; street layout; street level; system throughput; urban mobile radio environment; Access protocols; Additive noise; Antenna measurements; Frequency; Gaussian noise; Millimeter wave communication; Millimeter wave propagation; Optical propagation; Signal to noise ratio; Statistical distributions;
Journal_Title :
Vehicular Technology, IEEE Transactions on
