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Overview
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Frequency Bands
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Frequency Range
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Duplex
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Band Class 0
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824.0 – 849.0 MHz(uplink)
869.0 – 893.0 MHz (downlink)
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45 MHz
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Band Class 1
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1850.0 – 1910.0 MHz (uplink)
1930.0 – 1990.0 MHz (downlink)
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80 MHz
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Band Class 2
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872.0 – 915.0 MHz (uplink)
917.0 – 960.0 MHz (downlink)
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45 MHz
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Band Class 3
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887.0 – 925.0 MHz (uplink)
832.0 – 870.0 MHz (downlink)
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45 MHz
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Band Class 4
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1750.0 – 1780.0 MHz (uplink)
1840.0 – 1870.0 MHz (downlink)
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90 MHz
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Band Class 5
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411.0 – 483.0 MHz (uplink)
421.0 – 494.0 MHz (downlink)
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10 MHz
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Band Class 6
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1920.0 – 1980.0 MHz (uplink)
2110.0 – 2170.0 MHz (downlink)
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90 MHz
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Channel spacing
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30 kHz
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Channel Bandwidth
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1.2288 MHz
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Modulation
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QPSK (forward link)
OQPSK, HPSK (reverse link)
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Chip Rate
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1.2288 Mcps
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Access format
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CDMA
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Speech
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Digital transmission with one out of several possible vocoders:
QCELP (8 kbit/s) (quadrature code excited linear prediction)
EVRC (8 kbit/s) (enhanced variable rate codec)
ACELP (13 kbit/s) (algebraic code excited linear prediction)
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Power control
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Up to 800 power control commands per second changing the level in increments of 1 dB.
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Applications
CDMA is a growing mobile device standard, with networks established in a large number of countries around the world. CDMA supports data connections through circuit switched data (up to 14.4 kbit/s) and packet switched data (up to 307kbit/s, fl). A 3G evolution path for higher data rates utilizing 1xEV-DO (1x Evolution-Data Only) and 1xEV-DV (1x Evolution-Data and Voice) technologies exist and is being deployed.
In addition to voice services, users are experiencing a host of advanced services, including web browsing, m-commerce, MMS (multimedia messaging services), streaming video, games, enterprise solutions and email.
Technology in brief
CDMA is a "spread spectrum" technology, allowing many users to occupy the same time and frequency allocations in a given band/space. As its name implies, CDMA assigns unique codes to each communication to differentiate it from others in the same spectrum. In a world of finite spectrum resources, CDMA enables many more people to share the airwaves at the same time than do alternative technologies.
cdmaOne describes a complete wireless system based on the TIA/EIA IS-95 CDMA standard, including IS-95A and IS-95B revisions. It represents the end-to-end wireless system and all the necessary specifications that govern its operation. cdmaOne provides a family of related services including cellular, PCS and fixed wireless (wireless local loop).
CDMA2000 represents a family of ITU-approved, IMT-2000 (3G) standards and includes CDMA2000 1X and CDMA2000 1xEV technologies. They deliver increased network capacity to meet growing demand for wireless services and high-speed data services. CDMA2000 1X was the world's first 3G technology commercially deployed (October 2000).
Typical measurements
Transmitter Measurements:
- Maximum Output Power
- Minimum Output Power
- Frequency Error
- Transmit Modulation
- Waveform Quality (Rho)
Receiver Measurements:
- Reference Sensitivity Level
- Maximum Input Level
Willtek Test Instruments
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