基于随机几何理论的中继OFDM系统容量分析
doi: 10.3724/SP.J.1146.2013.00130
Capacity Analysis in Relay-assisted OFDM Systems Based on the Random Geometry Theory
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摘要: 该文将随机几何理论应用于特定的基于译码转发(DF)中继的OFDM系统中，通过推导分析建立基于随机几何理论的中继OFDM系统容量模型。文中假设用户在环域范围内服从随机均匀分布，同时假设接入域用户之间存在频率复用，通过在考虑接入中继链路对接入基站链路的共道干扰时，以干扰积分上限值替代实际干扰值等理论分析，在中继和基站节点功率受限的情况下，得到完整的系统闭合容量表达式模型。并通过仿真对基于容量模型的系统传输速率值与理论值进行了比较，仿真结果证实了该文所建立的容量模型的合理性。Abstract: This paper applies the random geometry theory to Decode-and-Forward (DF) relay-enhanced Orthogonal Frequency Division Multiplexing (OFDM) system and derives a new system capacity model finally. There are some assumptions that multiple users distribute uniformly in a ring region around Base Station (BS) and frequency is reused existing among users in access zone. By using the upper bound of interfere integral value to alternate the actual interfere value when considering the co-channel interference, the closed expression of system capacity is obtained under the power constraints of BS and relay nodes. Simulation results show the validity of the system capacity model.
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Key words:
- OFDM /
- Decode-and Forward (DF) /
- Random uniform distribution /
- Co-channel interference
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