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

2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471) Pub Date : 2001-03-20 DOI:10.1109/SPAWC.2001.923866

N. Izuka, T. Yuge, Y. Daido

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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.

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固定无线接入系统上行链路同步模拟容差达到8比特/秒/赫兹/小区

本文评估了在6扇区小区条件下，固定无线接入系统中达到8比特/秒/赫兹/小区的上行链路的同步误差容限。系统采用CDMA/FDD/16QAM，提高了频谱效率。在该系统中，在存在小区间干扰的情况下，所有用户通过功率控制达到无差错状态。每个扇区的订户数量等于流程增益。每用户比特率为5mbit /s的倍数，最大为20mbit /s。我们估计上行链路的误码率，在同步错误的存在，如载波频率错误和定时错误的用户在一个扇区，因为错误降低了码的正交性。模拟误码率性能表明，一个扇区内的所有用户必须具有2%的归一化载波频率误差和3%的归一化定时误差，以保持上行链路编码的正交性。讨论了同步的可行性。

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2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)

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