Eficiência da transmissão de dados em sistemas de comunicação sem fio CDMA usando estratégias de correção de erro RLP e FEC na camada de enlace (Data transmission efficiency over CDMA systems employing RLP and FEC error control strategies on the radio link layer)

Gonzalo Fernando Olmedo (gonzalo@decom.fee.unicamp.br), Celso de Almeida (celso@decom.fee.unicamp.br), Renato Baldini (baldini@decom.fee.unicamp.br)

Universidade Estadual de Campinas, UNICAMP
This paper appears in: Revista IEEE América Latina

Publication Date: Sept. 2007
Volume: 5,   Issue: 5 
ISSN: 1548-0992

In this article, the normalized throughput and the normalized average delay for the transport layer at the reverse link of multicellular CDMA systems are obtained. For the transport layer the Transport Control Protocol (TCP) with consecutive retransmissions control is employed. On the radio link layer three TCP error control strategies are evaluated and compared. The first strategy is based on the radio-link-protocol (RLP), which breaks down the TCP packets into smaller blocks and uses an error detecting procedure to protect those RLP blocks. The second strategy uses forward-error-control (FEC) procedure at the radio link layer. In this case, two kinds of FEC are compared: convolutional and turbo coding. The third one is a hybrid between the first and second strategies with coding at the RLP layer. A frequency-selective Rayleigh fading channel with shadowing and power control loop error is considered.

Index Terms:
CDMA, Throughput, Average Delay, TCP, ARQ, RLP, FEC, convolutional codes, turbo codes.   

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