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- Spectral Efficiency of Multicarrier CDMA
- This paper analyzes the spectral efficiency (sum-rate per sub-carrier) of randomly spread synchronous multi-carrier code-division multiple access (MC-CDMA) subject to frequency-selective fading in the asymptotic regime of number of users and bandwidth going to infinity with a constant ratio. Both uplink and downlink are considered, either conditioned on the sub-carrier...
- Tags: CDMA, IEEE, Cellular Phones, Consumer Electronics, Personal Technology
- White papers 2005-02-01
- Information-Theoretic Multi-Hopping for Relay Networks
- Recent advances in multi-hopping are extended to relay networks having multiple antennas and multiple sources. As for the single-antenna and single-source case, one can achieve the ergodic capacity of wireless relay networks with phase fading if the relays are in a region near the source terminal, and if phase information...
- Tags: Lucent Technologies Inc., Network, Alcatel, Networking
- White papers
- Quality-of-Service Driven Power and Rate Adaptation Over Wireless Links
- This paper proposes a Quality-of-Service QoS driven power and rate adaptation scheme over wireless links in mobile wireless networks. Specifically, the proposed scheme aims at maximizing the system throughput subject to a given delay QoS constraint. First, the paper derives an optimal adaptation policy by integrating information theory with the...
- Tags: QoS, Wireless
- White papers 2006-06-28
- Transmit Optimization for MIMO-OFDM With Delay-Constrained and No-Delay-Constrained Traffic
- This paper studies low-complexity power control schemes to approach the capacity limits of Multiple-Input Multiple-Output Orthogonal-Frequency-Division-Multiplexing (MIMO-OFDM) channels under the assumption that perfect Channel State Information CSI is available at both the transmitter and the receiver. Two notions of channel capacity limit are considered, namely, the ergodic capacity for variable-rate...
- Tags: Optimization, Capacity, MIMO-OFDM
- White papers 2006-08-01
- Cross Layer Adaptive Control for Wireless Mesh Networks
- This paper investigates optimal routing and adaptive scheduling in a wireless mesh network composed of mesh clients and mesh routers. The mesh clients are power constrained mobile nodes with relatively little knowledge of the overall network topology. The mesh routers are stationary wireless nodes with higher transmission rates and more...
- Tags: University Of Southern California, Network, Mobility, Mesh Networking, Wi-Fi, Wireless, Networking
- White papers 2007-08-01
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