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A SAW-less (in Rx and Tx) tri-band (2 high, 1 low) WCDMA/HSPA transceiver IC is presented. An Rx IIP2 enhancement technique achieves IIP2 of +55 dBm without production calibration or special processing steps. Integration of an on-chip DC-DC converter simplifies RF subsystem eBOM and reduces current drain from battery to 40 mA/65 mA in Rx/Tx mode, respectively.
A single-chip RF receiver to support EDGE Evolution with downlink dual-carrier (DLDC) receive diversity and EVM < 3% in all bands for demodulating 32-QAM signals is described. DLDC multistat class 39 and single-carrier multistat class 44 have been achieved. Both receive paths achieve a l\IF < 2.5 dB, an IIP3 >-3.5 dBm in the GSM 850/900 MHz band, and each draws < 57 mA from battery.
A major challenge in the design of wireless ad hoc networks is the need for distributed routing algorithms that consume a minimal amount of network resources. This is particularly important in dynamic networks, where the topology can change over time, and therefore routing tables must be updated frequently. Such updates incur control traffic, which consumes bandwidth and power.
Wireless routing based on an embedding of the connectivity graph is a very promising technique to overcome shortcomings of geographic routing and topology-based routing. This is of particular interest when either absolute coordinates for geographic routing are unavailable or when they poorly reflect the underlying connectivity in the network. We focus on dynamic networks induced by time-varying fading...
Routing packets is a central function of multi-hop wireless networks. Traditionally, there have been two paradigms for routing, either based on the geographical coordinates of the nodes (geographic routing), or based on the connectivity graph (topology-based routing). The former implicitly assumes that geometry determines connectivity, whereas the latter does not exploit this inherent geometry of...
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