Title :
The effects of Ricean fading channel on microcellular mobile radio systems
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Illinois Univ., Chicago, IL, USA
fDate :
30 Sep-3 Oct 1990
Abstract :
The user capacity and spectrum efficiency of a microcellular mobile radio system using a fast frequency-hopped (FFH) spread-spectrum modulation technique are evaluated. Additive white Gaussian noise (AWGN) and a Rice distribution with random-to-specular ratio (K) are used to model the microcellular environment. The probability of bit error for noncoherent detection of on-off-keying (OOK) modulation operating in a Ricean fading channel is derived as a closed-form expression. At an average bit error rate 10-3 and considering only the degradation due to mutual interference, the system capacity and the spectrum efficiency are found to be 209 users and 33.44%, respectively. With K=-7 dB and a mean signal-to-noise ratio of 20 dB, the system capacity and spectrum efficiency are found to be 169 and 27.2%, respectively, at the same error rate. This capacity is roughly 1.21 times that of a cellular system
Keywords :
cellular radio; fading; frequency agility; radiofrequency interference; radiotelephony; radiowave propagation; spread spectrum communication; telecommunication channels; white noise; 20 dB; AWGN; BER; FFH; OOK; Rice distribution; additive white Gaussian noise; average bit error rate; bit error probability; closed-form expression; fast frequency-hopped; mean signal-to-noise ratio; microcellular mobile radio systems; mutual interference; noncoherent detection; on-off-keying; radiowave propagation; random-to-specular ratio; spectrum efficiency; spread-spectrum modulation; system capacity; user capacity; AWGN; Additive white noise; Bit error rate; Closed-form solution; Degradation; Fading; Frequency modulation; Interference; Land mobile radio; Spread spectrum communication;
Conference_Titel :
Military Communications Conference, 1990. MILCOM '90, Conference Record, A New Era. 1990 IEEE
Conference_Location :
Monterey, CA
DOI :
10.1109/MILCOM.1990.117522
