Simulated tolerance for up-link synchronization in fixed wireless access system attaining 8 bit/sec/Hz/cell

Author

Izuka, Noboru ; Yuge, Tetsuya ; Daido, Yoshimasa

Author_Institution

Inf. & Commun. Labs., Japan Telecom, Tokyo, Japan

fYear

2001

fDate

2001

Firstpage

142

Lastpage

145

Abstract

This paper evaluates the tolerances of a synchronizing error for the uplink in a fixed wireless access system attaining 8 bit/sec/Hz/cell under the condition of 6-sectored cell. The system adopts CDMA/FDD/16QAM to increase spectral efficiency. In the proposed system, all subscribers attain an error-free condition by power control in the presence of inter-cell interference. The number of subscribers per sector is equal to process gain. Bit rate per subscriber is a multiple of 5 Mbit/s and maximum 20 Mbit/s. We estimate BER performance for the uplink in the presence of synchronizing error such as carrier frequency error and timing error among subscribers in a sector because the errors reduce orthogonality of codes. Simulated BER performance shows that all subscribers in a sector have to have a normalized carrier frequency error of 2% and a normalized timing error of 3% to keep the orthogonality of the codes for the uplink. The feasibility of the synchronization is discussed

Keywords

adjacent channel interference; cellular radio; channel coding; code division multiple access; error statistics; interference suppression; power control; quadrature amplitude modulation; radio access networks; radio links; synchronisation; telecommunication control; 16QAM; 20 Mbit/s; 5 Mbit/s; 6-sectored cell; BER performance; CDMA; FDD; carrier frequency error; code orthogonality; fixed wireless access system; inter-cell interference; power control; simulated tolerance; spectral efficiency; synchronizing error; timing error; uplink synchronization; Bandwidth; Bit error rate; Computer errors; Error correction; Frequency synchronization; Interference; Multiaccess communication; Power control; Radio spectrum management; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, 2001. (SPAWC '01). 2001 IEEE Third Workshop on Signal Processing Advances in

Conference_Location

Taiwan

Print_ISBN

0-7803-6720-0

Type

conf

DOI

10.1109/SPAWC.2001.923866

Filename

923866