On the capacity of multicode and variable spreading gain access scheme for multicarrier CDMA systems supporting multirate services with transmit power control

The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI:10.1109/ICCS.2004.1359461

Xiaoyu Hu, Y. Chew

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引用次数: 3

Abstract

In this paper, the multicode (mc) and the variable spreading gain (VSG) access schemes for asynchronous multicarrier code division multiple access (MC-CDMA) systems supporting multirate services are considered. The system capacities for these two multirate access schemes are investigated. A transmit power control is proposed to maintain the link quality and improve the system capacity. Simulation results verified the correctness of the theoretical bit-error-rate (BER) performance expressions derived for MC-CDMA systems using these access schemes. Numerical results show that mc access scheme using orthogonal Gold spreading sequences give the best performance, and its superiority increases when the ratio between the data rates of both service class increases. In case when non-orthogonal Gold codes are used, mc access scheme shows a degrading in the system capacity as compared to VSG, due to the presence of larger self-interference (SI) among the sequences used by each high rate user

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支持发射功率控制多速率业务的多载波CDMA系统的多码和可变扩展增益接入方案的容量研究

研究了支持多速率业务的异步多载波码分多址(mc - cdma)系统的多码(mc)和可变扩展增益(VSG)接入方案。研究了这两种多速率接入方案的系统容量。为了保持链路质量和提高系统容量，提出了一种发送功率控制方法。仿真结果验证了所推导的MC-CDMA系统误码率(BER)性能理论表达式的正确性。数值计算结果表明，采用正交Gold扩展序列的mc接入方案具有最佳的性能，并且随着两种业务类别数据速率之比的增大，其优越性也随之增强。在使用非正交金码的情况下，由于每个高速率用户使用的序列之间存在较大的自干扰(SI)， mc访问方案与VSG相比显示出系统容量的下降

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The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.

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