What are CDMA channels?

The actual frequencies (uplink and downlink) used inside the frequency range are determined by the ARFCN. … Frequency Bands. DCS 1800PCS 1900ARFCN512-885512-810Uplink (UL) Formula (MHz)FUL(n) = 1710.2 + 0.2*(n-512)FUL(n) = 1850.2 + .2*(n-512)Downlink (DL) Formula (MHz)FDL(n) = FUL(n)+95FDL(n) = FUL(n)+80Frequency Bands – Keysight RFMW Sitemap rfmw.em.keysight.com › rfcomms › refdocs › gsm › gen_bse_cell_band

As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth. The technology is used in ultra-high-frequency (UHF) cellular phone systems in the 800 megahertz (MHz) and 1.9 gigahertz (GHz) bands.

In the United States, there are the four major frequency bands in use:

CDMA 850 is CDMA technology operating in the Cellular (850 MHz ) frequency band. Before the existence of GSM 850, the Cellular band was often referred to as the “800 MHz” band. “850 MHz” implies a different frequency band, but the two are often used interchangeably.

How Does CDMA Work? CDMA allows up to 61 concurrent users in a 1.2288 MHz channel by processing each voice packet with two PN codes.

A CDMA channel is a pair of 1.25MHz frequency bands separated by guard-band . The guard-band may be 45 or 80MHz wide. The pair of 1.25MHz band is located either in the 82-893 MHz range in case of cellular CDMA or in the 1850-1989 MHz range in case of PCS CDMA.