Resource mapping method of control channel in orthogonal frequency division multiplexing system

Abstract

The invention discloses a resource mapping method of a control channel in an orthogonal frequency division multiplexing system. The method comprises the following steps of: (1) dividing a wireless channel resource into a logic resource and a physical resource of which the total numbers are both N, coding the resources as L = l1, l2, ellipsis and lN, and P = p1, p2, ellipsis and pN respectively, and coding an OFDM SYMB of the wireless channel as 0, 1, ellipsis and N-1; (2) determining a frequency hopping function f (L), and obtaining offset v shift corresponding to the OFDM SYMB according to a formula v shift = ((NSC / n).(mod (NID, n* NRB))) / (2*m); (3) allocating the logical resource for PCFICH, and mapping the logical resource to the physical resource; and (4) allocating the logical resource when a vacant logic resource is PHICH and PDCCH in sequence, and mapping both logic resources to the physical resource according to a mapping function P = mod (f (L) +v shift, N). The method ensures that logically adjacent control channels with the same type in the same cell keep a distance as far as possible in a frequency domain, and the same control channel of the adjacent cells keeps a distance as far as possible in the frequency domain, reduces the interference among all the control channels, and improves the diversity effect of the OFDM technology.

Description

technical field The invention relates to a resource mapping method of a control channel in an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system. Background technique In 3GPP LTE (Long Term Evolution, 3GPP long-term evolution project), the uplink and downlink wireless channels adopt the OFDM technology, and in this technology, the physical resources of the uplink and downlink channels are distributed in a grid. In the grid-like distribution method, each small square represents the smallest unit RE (Resource Eement, resource element) of resource allocation. According to the existing 3GPP protocol definition, the downlink physical control channel has a total of PBCH (Physical broadcast channel, physical broadcast channel ), PCFICH (Physical control format indicator channel, physical control format indicator channel), PHICH (Physical hybrid-ARQ indicator channel, physical HARQ indicator channel), and PDCCH (Physical downlink co...

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Problems solved by technology

At present, there is no corresponding resource mapping method for PCFICH, PHICH and PDCCH channels

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