Power Control - Error Detection in WiMAX Technology

Power Control in Wimax Technology

Algorithms of power control are applied to enhance the general performance of the system, it is deployed by the base station sending power control information to every Wimax Customer Premise Equipments (CPEs) to control the transmit power level so that the level inward bound at the base station is at a fixed level. In a dynamical changing fading environment this pre-determined performance level indicates that the Customer Premise Equipment (CPE) only broadcasts sufficient power to meet this constraint. The communication would be that the CPE broadcast level is supported on worst case circumstances.

The power control decreases the general power consumption of theWimax Customer Premise Equipments (CPE) and the possible interference with other base stations. For Line-of-Sight (LOS) the transmission power of the Wimax Customer Premise Equipments (CPE) is approximately comparative to its distance from the base station, for Non-Line-Of-Sight (NLOS) it is also closely dependant on the clearance and barriers.  (Martin K, Holger K, Lizhi C Z)

Error Detection Techniques in Wimax Technology

WiMAX technology have built-in error detection techniques to reduce the system Signal to Noise Ratio (SNR) obligations. Convolutional Encoding, Strong Reed Solomon FEC, and interleaving algorithms are used to identify and correct errors to enhance throughput. These strong error correction techniques assist to recover corrupted frames that may have been missing due to frequency selective fading or burst errors. To remove the errors, Automatic Repeat Request (ARQ) is used that cannot be corrected by the Forward Error Detection (FEC) by resending the error-ed information again. This notably improves the Bit Error Rate (BER) performance for a similar maximum level. (Deepak Boppana, 2005)

See Also other enhancements in Wimax Technology:

OFDM (Orthogonal Frequency Division Multiplexing)

WiMAX & IMT-Advanced

Sub Channelization & Transmission Diversity

Antennas & Adaptive Modulation

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