Back to results
US 7,623,591 B2Granted
Diversity receiver
AssigneeSilicon Integrated Systems Corp.
InventorsYa-Ti Tseng, Wen-Sheng Hou
Life of this patent
Estimating the term…
Abstract
A diversity receiver includes N number of Fourier transform circuits, N number of channel estimators, N number of match filters, N number of soft demappers, a combination/selection unit, and a channel decoder. The diversity receiver merges the square of the absolute value of estimate channel frequency response and transmission data into a demodulation signal and then outputs the demodulation signal by means of the match filter.
Claims18
A diversity receiver for an orthogonal frequency division multiplexing (OFDM) system having N number of branches (N is a positive integer) for receiving M number of versions (M is a positive integer) of input signals, comprising:
- N number of Fourier transform circuits respectively provided in the N number of branches, wherein a Pth Fourier transform circuit (P is a positive integer;
- 1≦P≦N) receives a Qth version input signal (Q is a positive integer;
- 1≦Q≦M) and generates a Pth frequency-domain signal;
- N number of channel estimators respectively provided in the N number of branches, wherein a Pth channel estimator generates a Pth estimate channel frequency response according to the Pth frequency-domain signal;
- N number of match filters respectively provided in the N number of branches, wherein a Pth match filter receives the Pth frequency-domain signal and generates a Pth demodulation signal according to the Pth estimate channel frequency response;
- N number of soft demappers respectively provided in the N number of branches, wherein a Pth soft demapper receives the Pth demodulation signal and performs symbol mapping on the Pth demodulation signal to generate a Pth output signal;
- wherein the Pth frequency-domain signal comprises a Pth reference signal, and the Pth channel estimator generates a Pth estimate transmission value according to the Pth reference signal;
- N number of noise power estimators respectively provided in the N number of branches, wherein a Pth noise power estimator receives the Pth frequency-domain signal and generates a Pth channel weight according to the Pth estimate transmission value;
- and
- N number of multipliers respectively provided in the N number of branches, wherein a Pth multiplier multiplies the Pth output signal by the Pth channel weight to output a Pth multiplication.
7 more elements
A diversity receiver for an orthogonal frequency division multiplexing (OFDM) system, comprising:
- a channel estimator for generating an estimate channel frequency response according to a frequency-domain signal;
- a match filter for receiving the frequency-domain signal and generating a demodulation signal according to the estimate channel frequency response;
- wherein the frequency-domain signal comprises a reference signal, and the channel estimator generates an estimate transmission value according to the reference signal;
- a noise power estimator for receiving the frequency-domain signal and generating a channel weight according to the estimate transmission value;
- and
- a multiplier for multiplying the output signal by the channel weight to output a multiplication.
3 more elements
A diversity receiver for an orthogonal frequency division multiplexing (OFDM) system for receiving M number of versions (M is a positive integer) of input signals at different time, comprising:
- a Fourier transform circuit for receiving a Qth version input signal (Q is a positive integer;
- 1≦Q≦M) and generating a Pth (P is a positive integer;
- 1≦P≦M)frequency-domain signal;
- a channel estimator for generating a Pth estimate channel frequency response according to the Pth frequency-domain signal;
- a match filter for receiving the Pth frequency-domain signal and generating a Pth demodulation signal according to the Pth estimate channel frequency response;
- a soft demapper for receiving the Pth demodulation signal and performing symbol mapping on the Pth demodulation signal to generate a Pth output signal;
- wherein the Pth frequency-domain signal comprises a Pth reference signal which is a pilot signal, and the channel estimator generates a Pth estimate transmission value according to the Pth reference signal;
- a noise power estimator for receiving the Pth frequency-domain signal and generating a Pth channel weight according to the Pth estimate transmission value, wherein the Pth channel weight is in inverse proportion to a (P−1)th channel weight;
- a multiplier for multiplying the Pth output signal by the Pth channel weight to output a Pth multiplication;
- a combination/selection unit for receiving M number of multiplications and performing either combination or selection on the multiplications according to their signal qualities to generate a decode signal;
- and
- a channel decoder for decoding the decode signal to generate decoded data.
9 more elements
A diversity receiver for an orthogonal frequency division multiplexing (OFDM) system having N number of branches (N is a positive integer) for receiving M number of versions (M is a positive integer) of input signals, comprising:
- N number of Fourier transform circuits respectively provided in the N number of branches, wherein a Pth Fourier transform circuit (P is a positive integer;
- 1≦P≦N) receives a Qth version input signal (Q is a positive integer;
- 1≦Q≦M) and generates a Pth frequency-domain signal;
- N number of channel estimators respectively provided in the N number of branches, wherein a Pth channel estimator generates a Pth estimate channel frequency response according to the Pth frequency-domain signal;
- N number of match filters respectively provided in the N number of branches, wherein a Pth match filter receives the Pth frequency-domain signal and generates a Pth demodulation signal according to the Pth estimate channel frequency response;
- N number of soft demappers respectively provided in the N number of branches, wherein a Pth soft demapper receives the Pth demodulation signal and performs symbol mapping on the Pth demodulation signal to generate a Pth output signal;
- wherein the Pth frequency-domain signal comprises a Pth reference signal, and the Pth channel estimator generates a Pth estimate transmission value according to the Pth reference signal;
- and
- N number of noise power estimators respectively provided in the N number of branches, wherein a Pth noise power estimator receives the Pth frequency-domain signal and generates a Pth channel weight according to the Pth estimate transmission value;
- wherein the Pth channel weight is in inverse proportion to a (P−1)th channel weight.
7 more elements
Dependencies are inferred from the claim text.