Title :
SS-CDMA flexible wireless network: approximately synchronized CDMA modem for uplink
Author :
Kameda, S. ; Takahashi, K. ; Nakase, H. ; Tsubouchi, K.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
We have proposed an intracell uplink of a spread-spectrum code-division multiple-access (SS-CDMA) flexible wireless network based on approximately synchronized (AS) CDMA. Since the AS-CDMA has no co-channel interference, complicated transmission power control is not required. A modem of the AS-CDMA has been designed and implemented for the Japanese 2.4 GHz industrial, scientific and medical band. Using the implemented modem, the degradation of Eb/N0 from the theoretical limit is 1.0 dB at a bit error rate (BER) of 10-3 . Under a 2-user environment, the degradation of carrier-to-noise ratio from the case without undesired signal is 0.5 dB at a BER of 10 -3 when the desired-to-undesired signal ratio is -20.3 dB
Keywords :
cellular radio; code division multiple access; error statistics; modems; spread spectrum communication; surface acoustic wave convolution; 2-user environment; 2.4 GHz; BER; Japanese 2.4 GHz ISM band; SAW convolver; SS-CDMA; approximately synchronized CDMA modem; bit error rate; carrier-to-noise ratio; desired-to-undesired signal ratio; flexible wireless network; industrial scientific medical band; intracell uplink; spread-spectrum code-division multiple-access; Base stations; Bit error rate; Bluetooth; Degradation; Downlink; Interchannel interference; Land mobile radio cellular systems; Modems; Multiaccess communication; Wireless networks;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937225
