Patent ID: 7649927
Filing Date: 2010-01-19
Classification: H04L

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 convolution 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 the main baseband signal; a second 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 convolution 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 convolution filter; wherein the convolution filter comprising: a DFT or FFT function element that converts the time domain subtraction of the delay and gain adjusted main baseband signal and the peak reduced main baseband signal to frequency domain and produces a frequency domain of the subtraction of the delay and gain adjusted main baseband signal and the peak reduced main baseband signal; a multiplier that multiplies a pre-configured frequency domain baseband signal and the frequency domain (DFT or FFT) of the subtraction of the delay and gain adjusted main baseband signal and the peak reduced main baseband signal; an IDFT or IFFT function element that converts the output of a multiplier that multiplies a pre-configured frequency domain baseband signal and the frequency domain or output of the DFT (or FFT) of the subtraction of the delay and gain adjusted main baseband signal and the peak reduced main baseband signal to time domain; a detector that uses the main baseband signal to detect the timing of the OFDM or OFDMA signal, OFDM or OFDMA active sub-carriers, type of modulation of the OFDM or OFDMA active sub-carders and the level or magnitude of the OFDM or OFDMA active sub-carriers; a masking element that uses the information detected by the detector function, OFDM or OFDMA timing, OFDM or OFDMA active sub-carriers, type of the modulation of the OFDM or OFDMA active sub-carriers and the magnitude of the OFDM or OFDMA active sub-carriers to generate the frequency domain of the second baseband convolving signal for the multiplier of the convolution filter.