![]() Used in cdmaone and both 3G standards TI - 1011.Disadvantages – Implementation complexity of spread spectrum – Synchronization requirements – Power control is essential for practical operation.Large Capacity Increase compared to TDMA, FDMA.As number of users on a frequency increase the BER goes up though – frequency reuse cluster size of K = 1 !!!!.CDMA Advantages – resistant to narrow band interference – resistant to multipath fading and ISI – no hard limit on number of users (soft capacity). ![]() Universal frequency reuse (frequency reuse cluster size K =1) – Simple planning – large capacity increase TI - 1011.Traffic Channel – Pair of 1.25 MHz radio channels (up/downlink) – Several users share a radio channel separated by a code not a timeslot or frequency! – Receiver performs a time correlation operation to detect only desired codeword – All other codewords appear as noise due to decorrelation – Receiver needs to know only codeword and frequency used by transmitter – Adjust power often to prevent near –far problem.Code Division Multiple Access/FDMA/FDD. ![]()
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