Performance Analysis of Quantized Feedback JLS Precoder in CoMP transmission

Yasmine Fahmy


Joint Processing (JP) in Coordinated Multi-Point (CoMP) transmission allows user data to be jointly processed by several interfering base stations to achieve high performance and large capacity gain. This is achieved by making use of timing advance mechanisms; to ensure that the desired signals from the cooperating cells reach the mobile station at exactly the same time. The Joint Leakage Suppression (JLS) precoder is a suitable linear precoding scheme in this scenario. In this paper, JLS performance analysis is considered under real assumptions such as the presence of asynchronous reception of the interfering signals and the effect of the finite capacity backhaul links. The effect of quantizing the feedback channel on the sum rate is derived, and a tight upper bound of the rate loss due to quantization is obtained. Simulation results are provided to validate these results.

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