摘要:
A configurable Turbo-LDPC decoder having A set of P>1 Soft-Input-Soft-Output decoding units (DP0-DPP-1; DPi) for iteratively decoding both Turbo- and LDPC-encoded input data, each of the decoding units having first (I1i) and second (I2i) input ports and first (O1i) and second (O2i) output ports for intermediate data; First and second memories (M1, M2) for storing the intermediate data, each of the first and second memories comprising P independently readable and writable memory blocks having respective input and output ports; and A configurable switching network (SN) for connecting the first input and output ports of the decoding units to the output and input ports of the first memory, and the second input and output ports of the decoding units to the output and input ports of the second memory.
摘要:
Methods and apparatus are disclosed for detecting a control channel message transmitted on one of a plurality of shared control channels and targeted to a wireless receiver. In an exemplary method, messages transmitted over a plurality of shared control channels are decoded, and at least one likelihood metric is determined for each of the decoded messages. A best candidate is selected from the decoded messages, based on the likelihood metrics, and the at least one likelihood metric for the best candidate is compared to corresponding likelihood metrics for the messages other than the best candidate to determine whether the best candidate is a valid message. Wireless communication receivers configured correspondingly are also disclosed.
摘要:
A method of selecting a retransmission mode, for the transmission of data which have been first transmitted in acknowledged mode between a transmitter unit and a receiver unit over an interface, and for which no positive acknowledgement of said first transmission has been received at the transmitter unit, the data being processed according to an error correcting encoding scheme prior to transmission over the interface, is provided. The number of bits to be encoded and the number of bits to be sent over the interface are compared, and a type of retransmission mode for the retransmission of the first transmitted data is determined.
摘要:
A method and apparatus for transmitting an uplink signal are disclosed. The method for transmitting an uplink signal by a communication apparatus in a wireless communication system includes channel encoding control information, and multiplexing the channel encoded control information with a plurality of data blocks by performing channel interleaving, wherein the number of channel encoded symbols for the control information is determined using an inverse number of the sum of a plurality of spectral efficiencies (SEs) for initial transmission of the plurality of data blocks.
摘要:
A method for soft remodulation in a receiver of transmissions over a wireless telecommunication system, the method including obtaining from a FEC decoder a-posteriori LLR values, converting the a-posteriori LLR values into bit probabilities and computing improved soft symbols estimates as expected values using the bit probabilities in a recursive algorithm. Preferably, the step of converting is implemented using a pre-computed Look Up Table (LUT). Preferably, the step of computing is implemented in a Multiplier-Accumulator having a SIMD structure.
摘要:
Techniques to increase the capacity of a W-CDMA wireless communications system. In an exemplary embodiment, early termination (400) of one or more transport channels on a W-CDMA wireless communications link is provided. In particular, early decoding (421, 423) is performed on slots as they are received over the air, and techniques are described for signaling (431, 432) acknowledgment messages (ACK's) for one or more transport channels correctly decoded to terminate the transmission of those transport channels. The techniques may be applied to the transmission of voice signals using the adaptive multi-rate (AMR) codec. Further exemplary embodiments describe aspects to reduce the transmission power and rate of power control commands sent over the air, as well as aspects for applying tail-biting convolutional codes (1015) in the system.
摘要:
The present patent application discloses a method and apparatus for decoding, comprising decoding signals iteratively, mutually exchanging extrinsic information, calculating APP LLRs for both systematic and parity bits and making a hard decision after a plurality of iterations is completed based on accumulated soft information. The present patent application also discloses a method and apparatus for post decoding soft interference canceling, comprising generating updated a posteriori probabilities for systematic and parity bits from a turbo decoder, mapping the posteriori probabilities to soft symbols, quantizing the soft symbols, re-encoding a data packet, filtering a chip sequence, reconstructing an interference waveform, and scaling reconstruction filter coefficients using the symbols.
摘要:
Turbo coding method and apparatus with rate matching. The apparatus comprises a turbo encoder (505,601) having convolutional encoders of constraint length k as component encoders, and further comprising a rate matcher (507,607) for performing a puncturing operation. A bit inserter arranged before (503) or after (605) the turbo encoder is provided for inserting a predetermined number of bits into a transmission information bit stream if the effective coding rate of a transmission packet is a predetermined coding rate causing a degradation of performance. such degradation arises when the periodicity of the puncturer is identical to the periodicity of the convolutional encoders, which is defined as two to the power of their constraint length minus one (2^k-1).