System and method for providing FDD and TDD modes of operation for a wireless communications device
First Claim
1. A method of operating in both an FDD mode and a TDD mode for a wireless digital communications device, comprising the steps of:
- a) providing a first clock signal for FDD mode operation;
b) providing a second clock signal for TDD mode operation;
c) providing a clock counter;
d) selecting between said first clock signal and said second clock signal to be input to said clock counter, wherein for FDD operation said first clock signal is input to said clock counter and for TDD operation said second clock signal is input to said clock counter; and
e) reloading said clock counter to a predetermined count value after a pre-specified-count is achieved by said clock counter, the pre-specified count value depending upon one of FDD operation and TDD operation.
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Abstract
A system and method is described herein for providing FDD and TDD modes of operation for a wireless communications device. The system includes a clock signal for FDD mode operation, a separate clock signal for TDD mode operation, where the TDD mode clock is twice the frequency of the FDD clock. Additionally, a counter is provided for counting bit times during a transmission or receive frame. The clock counter is reloaded after a pre-specified count is achieved. The pre-specified count is twice as great in TDD mode operation than in FDD mode operation to account for the fact that the bit periods are twice as long in FDD operation than during TDD operation since transmit and receive are at different frequencies and are not sharing the same channel.
80 Citations
20 Claims
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1. A method of operating in both an FDD mode and a TDD mode for a wireless digital communications device, comprising the steps of:
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a) providing a first clock signal for FDD mode operation; b) providing a second clock signal for TDD mode operation; c) providing a clock counter; d) selecting between said first clock signal and said second clock signal to be input to said clock counter, wherein for FDD operation said first clock signal is input to said clock counter and for TDD operation said second clock signal is input to said clock counter; and e) reloading said clock counter to a predetermined count value after a pre-specified-count is achieved by said clock counter, the pre-specified count value depending upon one of FDD operation and TDD operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for implementing FDD and TDD modes of operation for a wireless digital communications device, comprising:
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a) a first clock signal generator which generates an FDD mode clock signal; b) a second clock signal generator which generates a TDD mode clock signal; c) a clock counter; d) a selector device which selects between an output from said first clock signal generator and said second clock signal generator for input to said clock counter according to whether the system is operating in FDD or TDD mode; wherein said clock counter is reloaded to a predetermined count value after said clock counter achieves a first pre-specified count for FDD mode of operations, and a second pre-specified count for TDD mode of operation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system for implementing FDD and TDD modes of operation for a wireless digital communications device, comprising:
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a base clock signal generator; a first division circuit coupled to the base clock signal generator, the first division circuit operable to generate an FDD clock signal from a base clock signal generated by the base clock signal generator; a second division circuit coupled to the base clock signal generator, the second division circuit operable to generate a TDD clock signal from the base clock signal; a selector coupled to the first and second division circuits, the selector operable to receive a mode select signal, the selector selecting between the FDD clock signal and the TDD clock signal according to the mode select signal; a counter coupled to the selector; and a decode circuit coupled to the counter, the decode circuit operable to receive a counter signal from the counter and to provide a reload signal to the counter, the reload signal causing the counter to return to a predetermined value. - View Dependent Claims (19, 20)
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Specification