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SUM RATE OPTIMAL NETWORK BEAMFORMING AND SUBCARRIER POWER ALLOCATION FOR MULTI CARRIER SYNCHRONOUS TWO WAY RELAY NETWORKS
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SUM-RATE OPTIMAL NETWORK BEAMFORMING AND SUBCARRIER POWER ALLOCATION FOR MULTI-CARRIER SYNCHRONOUS TWO-WAY RELAY NETWORKS

Category :


Sub Category : MIMO-RELAY


Project Code : ITDSP02


Project Abstract

In this paper, we consider a multicarrier asynchronous bidirectional relay network, where different relay-transceiver links can cause different delays in the signals they convey, thereby producing inter-symbol-interference at the two transceivers. Such a two-way relay link can be modeled as a frequency selective channel with multiple taps, and thus, it can be equalized using orthogonal frequency division multiplexing (OFDM) transmission and reception schemes at the two transceivers, while the relays use simple amplify-and-forward relaying protocol. We prove rigorously that maximizing the sum-rate under a total power budget, through jointly optimal network beamforming at the relays and subcarrier power loading at the two transceivers, leads to a relay selection scheme, where only those relays which contribute to one tap of the end-to-end channel impulse response, have to be active and the remainder of the relays have to be switched off. The optimal tap can then be obtained using a simple search method. Moreover, we present semi-closed-form solutions for the optimal value of transceivers’ subcarrier powers as well as for the relay beamforming weights.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT

In the latter scheme, both transceivers and relay nodes consume the same amount of power.

 

An equal power allocation (EPA) scheme, where the total transmit power is equally distributed among all nodes of the network.

PROPOSED CONCEPT

orthogonal frequency division multiplexing (OFDM) transmission and reception schemes at the two transceivers, while the relay use simple amplify-and- forward relaying protocol. For such a network, we considered the relay beamforming amplify-and-forward weights and the transceiver subcarrier powers as the design parameters and proved rigorously that maximizing the network sum-rate under a total power constraint leads to a relay selection scheme.

EXISTING TECHNIQUE:

Equal Power Allocation (EPA)

PROPOSED TECHNIQUE:

SUM-RATE MAXIMIZATION APPROACH.

TECHNIQUE DEFINITION:

an equal power allocation (EPA) scheme, where the total transmit power is equally distributed among all nodes of the network.

TECHNIQUE DEFINITION:

maximizing the network sum-rate under a total power constraint leads to a relay selection scheme, where only those relays which contribute to one tap of the end-to-end channel impulse response have to be active and the remainder of the relays have to be switched off. The optimal tap can then be obtained using a simple search method and the optimal values of the transceivers’ subcarrier powers as well as those of the relay beamforming weights can be obtained in semi-closed-form solutions.

 

DRAWBACKS

In this EPA scheme, the total power is equally distributed over all subcarriers and among all nodes. So increased power usage.

EPA method does not offer any optimality.

ADVANTAGES

where only those relays which contribute to one tap of the end-to-end channel impulse response have to be active and the remainder of the relays have to be switched off.

 


 
 
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