Time-Domain Spreading And Frequency-Domain Spreading for Delay-time/Code Division Multi-Access

—The uplink (mobile-to-base) bit error rate (BER) performance is significantly degraded due to the multi-access interference (MAI). Recently, we have proposed a new hybrid multi-access technique, called delay-time/code division multiaccess (DT/CDMA). A different user is assigned a different cyclic time delay and/or spreading code. DT/CDMA can obtain the frequency diversity gain while suppressing the MAI. In the previous paper, time-domain spreading was considered. In this paper, we consider frequency-domain spreading and compare the achievable BER performances of DT/CDMA using time-domain spreading and frequency-domain spreading. Keywords-components; Delay-time, multi-access, frequencydomain equalization

• Type: Conference
• Year: 2008
• Where: VTC
• Authors: Kazuki Takeda, Tetsuya Yamamoto, Fumiyuki Adachi
• Keywords: Communications, Frequency-domain Spreading, Hybrid Multi-access Technique, Time-domain Spreading, VTC 2008