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A novel low-power 2–1–1 cascade sigma delta (SD) modulator with single-bit quantizers for multi-standard wireless radio receivers is proposed in the paper. In order to reduce the power dissipation, the multirate technique is introduced. The multirate modulator decreases the sampling frequency of the 1st stage integrators which primarily determine the power consumption of the total modulator. The resolution...
A novel low-power multi-rate sigma delta modulator is proposed, which is capable to support a wide range of wireless communication standards. The modulator is based on the 2–2 cascade single-bit architecture for good stability and linearity. The multi-rate technique is adopted to decrease the sampling frequency of the 1st stage integrators of the sigma delta modulator to reduce the power dissipation...
A new low power multimode switched-capacitor sigma delta modulator (SDM) architecture for wireless communication receivers is proposed in the paper. The proposed modulator uses a cascade 2-1-1 topology with single-bit quantizer for stability and inherent linear. The double-sampling SDM and multirate SDM are incorporated together to reduce the slewrate of the operational amplifier (OPAMP) and power...
A 2–2 cascade multirate sigma delta modulator targeting for GSM/ Bluetooth/ GPS/ WCDMA/ WLAN/ WiMAX application is designed in this paper. According to the needs of the customers and desired Quality of Service, the proposed modulator should be a power and area efficient reconfigurable sigma delta modulator with variable bandwidth and dynamic range. The multirate technique is introduced in the modulator...
In wireless IEEE802.16-based relay networks, link layer handover requires more signaling interactions, and the signaling cost and processing delay will increase while using MIPv6 to relay networks. Aiming to this problem, we propose a fast handover scheme to apply FMIPv6 to 802.16j networks, which determines the cross-subnet handover in advance through the interaction of MAC layer messages. Our scheme...
In this paper, a QoS differentiation adaptive retransmission limits ARQ (QDARL-ARQ) is proposed to improve the efficiency of retransmission in conventional SR-ARQ for the IEEE 802.16e BWA systems. With a simple algorithm implemented based on the conventional SR-ARQ, QDARL-ARQ scheme is able to dynamically adjust the retransmission limits for services with different characteristics by considering their...
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