Abstract
This paper deals with multiuser detection through base station cooperation in an uplink, interference-limited, high frequency reuse scenario. Distributed iterative detection (DID) is an interference mitigation technique in which the base stations at different geographical locations exchange detected data iteratively while performing separate detection and decoding of their received data streams. This paper explores possible DID receive strategies and proposes to exchange between base stations only the processed information for their associated mobile terminals. The resulting backhaul traffic is considerably lower than that of existing cooperative multiuser detection strategies. Single-antenna interference cancellation techniques are employed to generate local estimates of the dominant interferers at each base station, which are then combined with their independent received copies from other base stations, resulting in more effective interference suppression. Since hard information bits or quantized log-likelihood ratios (LLRs) are transferred, we investigate the effect of quantization of the LLR values with the objective of further reducing the backhaul traffic. Our findings show that schemes based on nonuniform quantization of the "soft bits" allow for reducing the backhaul to 1–2 exchanged bits/coded bit.
Highlights
An ever growing demand for new broadband multimedia services emphasizes the need for higher spectral efficiency in future wireless systems
Outer cell interference in future cellular networks can be suppressed through base station cooperation
We presented an alternative strategy to the distributed antenna system (DAS) for mitigating other cell interference (OCI) which we termed as distributed iterative detection (DID)
Summary
An ever growing demand for new broadband multimedia services emphasizes the need for higher spectral efficiency in future wireless systems. For a star network (commonly used today) interconnecting the BSs, this results in a huge backhaul traffic Another approach to convert situations where cochannel users interfere each other with comparably strong signals into an advantage for a high-frequency reuse cellular system was proposed in [18]: different BSs cooperate by sending quantized baseband signals to a single central point for joint detection and decoding. Such a distributed antenna system (DAS) reduces the aggregate transmitted power, and results in much improved received SINR [19]. We distinguish Ld1, Ld2, and Lext which are APPs generated at the detector and the decoder of a given BS or externally to it
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More From: EURASIP Journal on Wireless Communications and Networking
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