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In Multi-user MIMO (MU-MIMO), the Base Station (BS) schedules multiple users simultaneously on the same resources. Closed loop MU-MIMO uses explicit feedback from each of these users for scheduling and allocation of resources. In this scheme, an estimate of the SINR experienced is fed back by each user and is known as the CQI (Channel Quality Information). This CQI is used by the BS for link adaptation...
Future cognitive radio broadband wireless networks are expected to support a variety of communication services with diverse quality-of-service (QoS) requirements. Multimedia applications such as broadband voice transmission and real-time video streaming are very delay-sensitive and need guaranteed throughput. On the other hand, applications like file transfer and email services are relatively delay...
Mathematical model of multi-user power control and resource allocation in cognitive OFDM system is investigated. Multi-user resource allocation with the target of maximizing the cognitive user's transmission rate and satisfying the proportional rate constraint between cognitive users is proposed in the condition of primary user's interference constraint. The paper supposes that cognitive transmitter...
We propose a novel distributed and low complexity joint channel and power allocation scheme for the uplink of multi-cellular multi-carrier systems. The algorithm is based on the min-sum message passing (MP) scheme that entails passing messages between the base station (BS) and mobile terminals (MTs) with the aim of achieving a low power consumption resource allocation while respecting rate constraints...
Multi-user cognitive orthogonal frequency division multiplexing (MU-COFDM) is a promising technique for achieving high transmission capacity in future cellular and wireless local area network (WLAN) systems. Multi-user resource allocation with the target of maximizing the transmit capacity of cognitive users and satisfying the proportional rate constraint between cognitive users is proposed under...
Cognitive radio (CR) is one of the important paradigms proposed by FCC for improving the spectrum utilization. To make agile spectrum resources allocation between the primary users (PUs) and the secondary users (SUs), Orthogonal Frequency Division Multiplexing (OFDM) has been taken as one of the potential modulation candidates in the physical layer in CR. This paper presents a mathematical model for...
The next generation of wireless networks (4G) will use OFDMA (Orthogonal Frequency Division Multiple Access) in the reverse link. In OFDMA, the reverse link resources assigned to a user are called tiles each of which consists of a subset of consecutive subcarriers. Since at most one user is assigned to each of these tiles then reverse link transmissions within a sector are orthogonal. However, the...
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