Intelligent MBWIMA/UMTS Protocol Using SDMA Scheduling in UTRA TDD Mode
Wireless Personal Communications: An International Journal
Performance investigation of CDMA/PRMA with power control in TDD multimedia cellular networks
ICAIT '08 Proceedings of the 2008 International Conference on Advanced Infocomm Technology
Uplink capacity analysis for multihop TDD-CDMA cellular system
IEEE Transactions on Communications
Blind user detection in doubly dispersive DS/CDMA fading channels
IEEE Transactions on Signal Processing
Joint iterativeTx/Rx MMSE-FDE and ISICancellation for single-carrier hybrid ARQ with chase combining
EURASIP Journal on Advances in Signal Processing - Special issue on advances in single carrier block modulation with frequency domain processing
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This article discusses an evolutionary TDD mode of CDMA-based path for 3.5G/4G systems. This technology has already been the basis of two 3G standards: TD-CDMA and TD-SCDMA with a synchronous uplink. Several techniques have been developed that allow TDD-CDMA-based systems to transmit at rates usually associated with 3.5G to 4G, up to 10-20 Mbit/s with wide area coverage. The present TDD-CDMA-based 3G standards are evolving to provide these higher rates, while fully retaining the coverage and mobility associated with, and expected from, the present mobile communications systems. This article discusses how TDD-CDMA specific techniques facilitate delivering services at data rates associated with 3.5G and 4G. We review how TDD-CDMA can provide for asymmetric uplink and downlink transmissions, facilitate deployment of advanced antennas for improved downlink coverage, and enable provision of advanced receiver techniques in base stations and mobiles. We also discuss how these techniques affect systems capacity in full packet-switched IP-based systems. We then discuss 4G TDD CDMA systems: those with different modulation techniques for uplink and downlink communications. These are generally based on a multicarrier mode of CDMA, and may incorporate OFDM technique.