Power control with effective eb/no

Details Power control with effective eb/no Power control with effective eb/no

H - Electricity

04

Q

H04Q 7/36 (2006.01) H04B 7/005 (2006.01)

Patent

CA 2316722

A method and apparatus to quickly adjust a targeted E b/N0 (270, 470) in a wireless communication system by using an effective E b/N0 (310, 510) for each frame. The E b/N0 distribution of a frame produces a certain frame error rate. Effective E b/N0 (310, 510) is the E b/N0 that would produce the same frame error rate in a model channel, such as an additive white Gaussian noise (AWGN) channel. The effective E b/N0 (310, 510) for each frame is obtained and compared to a model targeted E b/N0 (250, 480). The E b/N0 for all of the power control groups in one frame compose the vector E b/N0 (300, 500). The effective E b/N0 (310, 510) for the frame is obtained by mapping a vector E b/N0 (300, 500) into a scalar. The model targeted E b/N0 (280, 480) is the E b/N0 value that produces a desired frame error rate in the model channel. The targeted E b/N0 (270, 280) is increased by one up step size when the effective E b/N0 (310, 510) is smaller than the model targeted E b/N0 (280, 480) and is decreased by one down step size when the effective E b/N0 (310, 510) is larger than the model targeted E b/N0 (280, 480). E b/N0 (290, 490) are measured for each power control group in a frame. The wireless communication system includes a transmitter (400) to transmit a signal, a receiver (320) to receive the signal, and an outer control loop (250, 450) to adjust the targeted E b/N0 (270, 470) based on a comparison of the effective E b/N0 (310, 510) of the signal to the model targeted E b/N0 (280, 480). Preferably, the outer control loop (250, 450) is implemented in software, although it can be implemented in hardware. Obtaining an effective E b/N0 (310, 510) for each time period allows quicker adjustments of the targeted E b/N0 (270, 470). This permits the targeted E b/N0 (270, 470) to be closer to an E b/N0 that produces a desired frame error rate, especially if the mobile is moving. This allows the transmitted power to be closer to the power needed to produce the desired frame error rate, permitting an increase in the capacity of the wireless communication system while still maintaining an acceptable number of errors.

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