Abstract
Abstract Recent development in multicell cooperation poses significant technical challenges to the design of robust and flexible transmission techniques. A new multi-layered orthogonal frequency-division multiplexing (ML-OFDM) system is proposed in this article to provide a dynamic platform for multicell cooperation with efficient base station coordination capability. The proposed enhanced layers (ELs), which are overlaid with the cellular communication data (the base layer) in both frequency and time domains, can be used for several specific purposes indispensable to multicell cooperation. It provides an efficient way of sharing the necessary information, e.g., channel state information, user data and other transmission parameters, between the collaborative BSs without the requirement of additional signaling or control channels. Overall network efficiency is substantially enhanced due to the reduction of radio resource overhead. Furthermore, cross BS synchronization and multimedia broadcast multicast service for next generation cellular networks can be simultaneously achieved by the proposed parallel orthogonal ELs. The transceiver design for the ML-OFDM system, particularly the modulation/demodulation of the ELs and EL-induced interference cancelation is presented. Overall system performance is further optimized by proposing a power distribution scheme with a set of practical constraints. The performance of the ML-OFDM system is analyzed and verified through numerical simulations.
Highlights
The ever-increasing demand for broadband mobile multimedia applications brings significant challenges to the design of future-generation cellular networks
The 3GPP LTEAdvanced [10] standard, where the network coordination is known as coordinated multi-point (CoMP) transmission has been calling for standardization of signaling schemes for this technique since September of 2010 for possible consideration in future Releases of LTEAdvanced
Due to the significantly large gap between the operating signal-to-noise ratio (SNR) ranges of the enhanced layer (EL) and the base layer (BL), the bit error rates (BERs) of the ELs can already be very low at the SNR of traditional OFDM receiver such that the probability that the regenerated ELs’ signals E’i = Ei is close to unity
Summary
The ever-increasing demand for broadband mobile multimedia applications brings significant challenges to the design of future-generation cellular networks. The proposed EL can provide a dedicated over-the-air link among different BSs of exchanging the available information including the CSI pertaining to all relevant direct and interfering links, data symbols sent to the target mobile user and other transmission parameters such as power, beamforming coefficients, time slot, subcarrier usage and etc. These information can be sent concurrently with the user data-carrying signal (signal of BL) for dynamic BS coordination purposes.
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