Multidrop Data Transfer

摘要

Multi-drop communications channels can have significantly deep notches in their frequency response causing a corresponding limitation of the effective data transmission rate. A special time-ordered coding method is described which results in the emitted spectrum of the data stream transmitted into the channel having a notch at the same frequency as the notch in the channel frequency response, permitting channel receivers to successfully decode the transmitted data stream. The described coding method may be applied at various multiples of the channel notch frequency to support different throughput rates, and may be combined with other coding techniques such as group or vector signaling codes.

主权项

1. A method comprising:
receiving a frame of M receive symbols on a wire of a multi-wire bus, the multi-wire bus having a notch frequency fnotch, wherein each receive symbol of the received frame of M symbols comprises a channel-induced superposition of a transmit symbol of a first transmit frame of M symbols and a corresponding transmit symbol of a subsequent transmit frame of M symbols, wherein the first and subsequent transmit frames have a 2*M*fnotch symbol rate; and, forming a set of output symbols by decoding the M receive symbols using at least one prior decoded transmit symbol.