Method and apparatus for achieving channel variability in spread spectrum communication systems
AssigneeLucent Technologies Inc.
InventorZulfiquar Sayeed
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AssigneeLucent Technologies Inc.
InventorZulfiquar Sayeed
Estimating the term…
A method and apparatus are disclosed for modulating a communication signal in a CDMA environment using orthogonal N by N Hadamard spread spectrum codes. Orthogonal spreading codes are used that have lengths that are not a power-of 2 to provide additional channel variability for various multimedia applications and increase the flexibility of the number of channels/bandwidth relationship. The Hadamard codes are multiples of 4 (4n) and demonstrate a good cross-correlation property, making them very useful in the flexible design of CDMA systems. A transmitter encodes each of N data streams (N not being a power of 2), to be transmitted using a 4n codeword, Ni. The received signal is passed through a filter matched to the characteristics of the appropriate codeword, Ni, and PN spreading sequence.
A method of transmitting spread spectrum signals in a communication system, said method comprising the steps of:
A spread spectrum communication system for transmitting a data signal comprising:
A method for increasing the channel variability in a communication system comprising:
A method of transmitting spread spectrum signals in a communication system, said method comprising the steps of:
Dependencies are inferred from the claim text.