  Low-earth orbit (LEO) satellite communication is one of the enabling key
technologies in next-generation (6G) networks. However, single
satellite-supported downlink communication may not meet user's needs due to
limited signal strength, especially in emergent scenarios. In this letter, we
investigate an architecture of cell-free (CF) LEO satellite (CFLS) networks
from a system-level perspective, where a user can be served by multiple
satellites to improve its quality-of-service (QoS). Furthermore, we analyze the
coverage and rate of a typical user in the CFLS network. Simulation and
numerical results show that the CFLS network achieves a higher coverage
probability than the traditional single satellite-supported network. Moreover,
user's ergodic rate is maximized by selecting an appropriate number of serving
satellites.

Signal Processing;Algebraic Geometry