L15-x1rev

At higher frequencies propagation is mostly line of

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Unformatted text preview: frequencies, propagation is mostly line-of-sight. microwave transmission between tall towers. Use of electromagnetic spectrum is highly regulated Also power limits. The cellular concept in mobile communication Within a cell, the assigned frequency band is divided among cellular users. The division can be frequency multiplexing or time multiplexing, or a combination of both. Alternatively, CDMA (Code Division Multiple Access) can be used in a cell. Direct Sequence CDMA with L or m= 10 pulses (chips) per bit. simultaneously without coordination, with little interference. Ideally, code...
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