Exploiting interactions among signals to decode interfering transmissions with fewer receiving antennas

Autor: Jia Liu, Jiamin Ding, Kang G. Shin, Zhao Li, Xiaoqin Dai
Rok vydání: 2019
Předmět:
Zdroj: Computer Communications. 136:63-75
ISSN: 0140-3664
Popis: Due to the hierarchical structure and heterogeneity of most deployed wireless networks, multiple data transmissions using the same communication resource, such as same frequency band and time slot, are likely to occur in the same area. Hence, interference becomes critical to the decoding of interfered signals. There have already been numerous techniques dealing with interferences that can be implemented either at the transmitter (Tx) or the receiver (Rx) or both, to support simultaneous multi-user transmissions. We focus on the reception design in multiple access channels (MACs) where multiple Txs send data to a common Rx simultaneously. By exploiting the constructive/destructive interactions among interfering signals, we propose a Rx structure based on interference combination (ICom) that incorporates zero-forcing (ZF) and successive interference cancellation (SIC). In addition, by exploiting the relationship between the desired signal and interference, reception mode adaptation is employed to further improve the performance of the proposed reception mechanism. The proposed Rx structure does not require coordination at the Tx side and can significantly reduce the number of receiving antennas at a moderate processing cost. The ICom-based reception is shown to be able to make not only a significant improvement of system spectral efficiency (SE) under stringent latency constraints, but also a flexible tradeoff between the requirements of receive antennas and signal processing complexity, thus facilitating its implementation and deployment.
Databáze: OpenAIRE
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