Patent ID: 7649931
Filing Date: 2010-01-19
Classification: H04B

Abstract:
1. An equalizer filter with dynamically configurable code domain filter, to condition and smoothen a main baseband signal to improve the performance of a transmit path, for use with Code Domain Multiple Access (CDMA) signals to enhance the performance of any communication transmitter, in any wireless cellular, Personal Communication System (PCS), wireless Local Area Network and Wireless Wide Area Network (LAN/WAN), Video and Audio Wireless Broadcasting, line of sight point-to-point microwave, military, satellite communication systems and any other wireless applications, the equalizer filter with dynamically configurable code domain filter comprising: a peak reduction filter to produce a peak reduced main baseband signal; a feedforward loop that injects a controlled in band and out of band baseband signal into the main baseband signal to produce an injected baseband signal; a first gain element that adjusts the gain of sum of a delay and gain adjusted main baseband signal and the injected baseband signal; a controller that uses the main baseband signal, the output of the equalizer filter with dynamically configurable code domain filter, and external information to provide control signal to various delay and gain functions as well as peak reduction filter, the correlation function and a code domain filter function; wherein the feedforward loop comprising: a delay element that adjusts the delay of the main baseband signal to produce a delayed main baseband signal; a second gain element that adjusts the gain of the delayed main baseband signal to produce a gain adjusted delayed main baseband signal; a subtracting element that subtracts the gain adjusted delayed main baseband signal and the peak reduced main baseband signal; a correlator that correlates the main baseband signal and the result of the subtraction of the gain adjusted delayed main baseband signal and the peak reduced main baseband signal to calculate the amount of the delay adjustment for the main baseband signal in a feedforward loop and the gain adjustment for the delayed main baseband signal; a dynamically configurable code domain filter that filters the result of the subtraction of the gain adjusted delayed main baseband signal and the peak reduced main baseband signal in a feedforward loop before injection into the main baseband signal to produce a code domain filtered signal; a third gain element that adjusts the code domain filtered signal to produce the injected baseband signal; a delay/gain adjustment element that delays and gain adjusts the main baseband signal; a summing element that adds the delay and gain adjusted main baseband signal and the injected baseband signal.