Abstract: A receiver comprises a plurality of paths for receiving wireless signals, each path having a designated antenna; and an antenna diversity chain adapted for information communication between the plurality of paths for a selecting and using a path among the plurality of paths.

Abstract: A receiver having a de-interleaver with a processor for processing interleaved data; and a built-in eDRAM coupled to the processor for processing the interleaved data is provided.

Abstract: A method for selecting parameter comprising the steps of: providing a plurality of paths each path associated with an independent antenna, and each path comprising: a set of parameters associated with a particular channel; and deriving a parameter among each and every of the set of parameters associated with a particular channel. The method further comprises the step of providing a time de-interleaver or FEC decoder shared by the plurality of paths.

Abstract: A method and apparatus for a receiver comprises: a plurality of paths with each path associated with an independent antenna. Each path comprises: a channel estimation device associated with a particular channel; and a set of parameters denoting channel characteristic associated with each path. The receiver further comprises a time de-interleaver or FEC decoder shared by the plurality of paths. Whereby at least one device that use significant amount of memory is shared by the plurality of paths.

Abstract: In an OFDM (Orthogonal frequency-division multiplexing) communication system, a receiver comprising an inner forward error correction device, or an inner forward error correction device is provided. Either the inner forward error correction device, or the outer forward error correction device comprises an improved method for deriving a bit log-likelihood ratio derived from a symbol log-likelihood ratio. The method includes the steps of: providing two simplified parameters; and using the two simplified parameters in addition and subtraction only to derive the bit log-likelihood ratio derived from the symbol log-likelihood ratio.

Abstract: A new, improved method for mix min-sum decoding using a LDPC code is provided. In order to reconcile the drawbacks of the belief propagation (BP) and min-sum method, but at the same to keep the benefit of same, two major improvements have been proposed in the present invention. In the hardware implementation, due to using fixed-point implementation, it is found the better results lower error floor occurs. The second one has better performance in the range of BER=1e-3 to 1e-6. This invention proposes a method to combine the two improved methods into one, thereby achieving good performances at both cliff region and floor region.

Abstract: The present invention provides a reduced memory implementation for the min-sum algorithm compared to traditional hardware implementations. The improvement includes innovative MIN_SUM method with reduced memory requirements suitable of computer implementation that combines the traditional row update process and column update process into a single process, in that the traditional CNU unit and VNU unit are combined into a single CVNU unit. The improvement not only reduces the time required for decoding by half, but also reduces the logic and routing efforts. Furthermore, instead of storing the whole intermediate LLR values using a significant number of memories, only a set of parameters associated with the intermediate LLR values is stored. The set of parameters includes: 1. sign of LLR; 2. the minimum LLR, 3. sub-minimum LLR, and 4. the column location of minimum value in each row.

Abstract: A channel estimation using the received PN (pseudo-noise) sequence associated with a received frame among a plurality of associated, neighboring frames. The estimation using a value associated with a point of a currently frame as a denominator in a predetermined formula. If the value is smaller than its corresponding value in a neighboring frame, the neighboring frame's corresponding value is used instead of the value of the current frame.

Abstract: In an OFDM (Orthogonal frequency-division multiplexing) communication system having a PN sequence as guard area, a code acquisition method is provided. The method includes the steps of: determining a precursor to a main peak using correlation; and using the precursor as a starting point for a new frame.

Abstract: A receiver adapted to receive both OFDM signals and single carrier signals is provided. The receiver possesses substantially commonly shared circuitry or function blocks, except an IFT (inverse Fourier transform) block adapted a receive frequency domain signals from a channel equalizer for converting the received frequency domain signal to a time domain signal, and a bypass for bypassing the IFT.

Abstract: In a LDPC based communications system, a method for generating LDPC codes is provided. The method comprises the steps of: constructing a base matrix; providing a plurality of sub-matrices for forming the base matrix, with each sub-matrix being a cyclic permutation matrix; and masking the base matrix using a small sparse matrix.

Abstract: A device for equalization adapted for receiving a symbol and a channel frequency response is provided. The device includes a slicer for delimiting the channel frequency response to a sliced channel frequency response based upon a signal constellation; and a divider for dividing the received symbol using the sliced channel frequency response as the divider, with a resultant quotient of the divider as a reference point for future received symbols.

Abstract: A receiver having an apparatus having a processor for processing interleaved data; and an independent memory coupled to the processor for processing the interleaved data is provided.

Abstract: This invention relates to the architecture of a 3780-point forward and inverse Fast Fourier Transform (DFT), which is used in a TDS-OFDM system. The number 3780 is factored to 3*3* . . . *3*M. Where M is a natural number that cannot be factored by 3.

Abstract: In a TDS-OFDM receiver a device for frequency-domain compensation for channel estimation at an over-sampling rate is provided. The device includes a correlater for correlating a first signal and a second signal; a transformer for transforming the correlated signals into a frequency domain; and an interpolater and truncater block for interpolating and truncating the transformed signal to have the interpolated and truncated, transformed signal as a reference for future use.

Abstract: An OFDM (Orthogonal frequency-division multiplexing) communication system is provided. The system includes at least two programs being simultaneously transmitted under one spectrum. Each program is respectively modulated under a different or similar scheme. Each of the at least two programs commonly share a control frame. The control frame is transmitted under a similar or more robust modulation scheme than the at least two programs' modulations respectively.