基于OFDM多用户对双向中继宽带无线网络空频信道配对与功率分配

Space-frequency channel pairing and power allocation for OFDM-based multi-pair two-way relay wireless networks

针对宽带OFDM的多用户对双向中继无线网络,为了进一步提高系统和速率与误码性能,本文首先提出了一种基于最大化和速率的空频联合信道配对算法,同时推导了该算法低复杂度的闭式表达式,随后引入空频联合注水功率分配算法.仿真结果表明,同仅有空间配对和无空频信道配对算法相比,所提出的最大化和速率空频信道配对方案可以明显提高系统的和速率与误码率性能;同空频等功率分配相比,空频维注水功率分配在中低信噪比区间能有效地提高系统误码性能.

To improve multi-pair two-way relay wideband wireless networks using orthogonal frequency-division multiplexing, this paper proposes a space-frequency （SF） joint channel pairing （CP） that maximizes the sum-rate （MSR） after block diagonalization beamforming at a relay station （RS）. Following this, a space-frequency （SF） joint water filling power allocation （WFPA） is designed to further improve the performance of the system. Simula- tion results illustrate that, compared to space channel pairing without CP, the proposed MSR-SFCP can achieve substantial performance gains, including improvements in the sum-rate and bit error rate （BER） for a given signal-to-noise ratio （SNR）. In contrast, the SF-WFPA can improve BER performance in the low and medium SNR regimes, compared to equal power allocation.