Power and rate control with outage constraints in CDMA wireless networks

Abstract

A radio power control strategy to achieve maximum throughput for the up-link of CDMA wireless systems with variable spreading factor is investigated. The system model includes slow and fast fading, rake receiver, and multi-access interference caused by users with heterogeneous data sources. The quality of the communication is expressed in terms of outage probability, while the throughput is dened as the sum of the users' transmit rates. The outage probability is accounted for by resorting to a lognormal approximation. A mixed integer-real optimization problem P1, where the objective function is the throughput under outage probability constraints, is investigated. Problem P1 is solved in two steps: rstly, we propose a modied problem P2 to provide feasible solutions, and then the optimal solution is obtained with an efcient branch-and-bound search. Numerical results are presented and discussed to assess the validity of our approach.

Cross-layer radio resource allocation for multi-service networks of heterogeneous traffic

“…(12) Note that N d and N v are represented in terms of each other. (9) and (11), can therefore be used to derive explicit expressions…”

“…Typically, this is achieved by employing multi-code (MC)/variable spreading factor (VSF), where transmission rates are adapted to fading-induced channel quality fluctuations. However, the results from [8] and [9] have shown that further adapting the transmission rate to the time-varying MUI levels, can significantly improve effective throughput. Further, most of the previous work on multi-rate CDMA have been implemented based on the BER performance in physical (PHY)-layer [10].…”

Dynamic Power Control for Wireless Backbone Mesh Networks: a Survey

“…Some algorithms minimize total transmission power consumption over a set of discrete available power levels (e.g., [43]). Still other algorithms seek to minimize outage probability of the SIR (e.g., [24,44]). …”

“…Numerous studies on Integer Linear Programming (ILP) for power optimization formulations have been conducted by (e.g., [7,18,24,32,44,46]). Power and rate control outage based under multiple access interference (MAI) and heterogeneous traffic sources have been proposed by [24,44].…”

“…Power and rate control outage based under multiple access interference (MAI) and heterogeneous traffic sources have been proposed by [24,44]. The authors formulated the total rate maximization problem by a base receiver station for all nodes.…”