CDMA digital cellular overview and field trials results

摘要: Since the late 1980s, QUALCOMM Incorporated, based in San Diego, California, firmly believed that code division multiple access (CDMA), a modulation and scheme on spread spectrum communications, could form basis for spectrum-efficient, economical, quality digital cellular radio network. recognized that, as well established technology, CDMA had significant advantages over other wireless techniques. These included isolation provided by an antenna system, geometric spacing, power gating of transmissions voice activity, control, very efficient modem signal designs which use error-correction coding. To verify these advantages, QUALCOMM, with support key industry organizations, designed, developed, tested unique system implementation This has been deployed worldwide various configurations applications such cellular, PCS, local loops. date, successfully manufactured, deployed, operated, maintained thirty (30) field systems throughout United States, Europe, Asia, South America, Australia. extensive experience demonstrates without doubt viability world.