Planning Optimization of the Distributed Antenna System in High-Speed Railway Communication Network Based on Improved Cuckoo Search

Table 1

Introductions of the parameters used in Section 2.

Symbol	Meaning
	Length of the railway
	Total number of antenna units
	Number of logical cells
	Number of antenna units in ith logical cell
	Coordinate sets of antenna units in ith logical cell
	Maximum transmission rate in
	Bandwidth of the current system
	Performance gap of the coding/modulation scheme
	Bit error constraint
	Average signal to noise ratio in
	Transmission power of the kth antenna unit of the ith logical cell
	Channel gain of the kth antenna unit of the ith logical cell
	Small-scale fading
	Path loss of the ratio transmission
	Linear distance between the train and the kth antenna unit of the ith logical cell
	Constant coefficients
	Path loss exponent