METHODS AND APPARATUSES FOR MULTIPLE ACCESS IN A WIRELESS COMMUNICATION NETWORK USING DCT-OFDM

摘要

The present invention provides an advantageous transmitter apparatus and associated method, for generating a Single-Carrier Discrete Cosine Transform (SC-DCT) OFDM signal for transmission. These transmit-side innovations include circuit configuration and signal processing methods for mapping Ku “input subcarriers” to N “output subcarriers,” where the “output subcarriers” are some or all of the subcarriers defined for the SC-DCT OFDM signal. In one or more embodiments, Ku is less than N, and the mapping is based on advantageous DCT/IDCT precoding. The present invention additionally or alternatively includes advantageous frequency-selective mapping, and further provides a corresponding receiver apparatus and associated method, for receiving and de-mapping the SC-DCT OFDM signals contemplated herein.

主权项

1. A transmitter circuit configured to generate a Single-Carrier Discrete Cosine Transform (SC-DCT) OFDM signal for transmission, said transmitter circuit comprising:
a signal processing chain configured to map Ku input subcarriers to N output subcarriers, according to the formula N=2SKu, wherein S indicates the integer number of DCT precoder stages included in series within the signal processing chain, wherein S≧1, and wherein said signal processing chain includes a serial-to-parallel converter configured to generate the Ku input subcarriers according to a series of information symbols to be transmitted, a prefix or padding circuit configured to add a cyclic prefix or a zero padding to the N output subcarriers, for input to a parallel-to-serial converter that is configured to form the SC-DCT OFDM signal; and wherein said signal processing chain further includes one or more series DCT precoder stages between the serial-to-parallel converter and the prefix or padding circuit, each such stage configured to generate 2M output subcarriers from M input subcarriers, and to map the M input subcarriers to even-numbered or odd-numbered ones of the 2M output subcarriers, in dependence on a even/odd shift control signal applied to the stage, and each such stage comprising a DCT circuit followed by an IDCT circuit; and wherein a first one of the DCT precoder stages takes the Ku subcarriers as its M input subcarriers, and a last one of the DCT precoder stages provides the N output subcarriers as its 2M output subcarriers.